Guestbook

Feel free to add to my guestbook but PLEASE, this is not a venue for advertising. If you feel the need to advertise, try spamming like the rest of the knobs on the internet! E-Mail addresses will be put into machine-unreadable format to make it difficult for spam robots to acquire them (although not impossible). Remove the three "x"'s and underscores to get the email address (they prevent regular expression parsing of email addresses).

If you are writing to contact the college (e.g. regarding admissions to programs) send e-mail to the Registrar at the college. This is my personal guestbook and is not affiliated with my activities as a professor.

A small part of ...

Professor Mark Csele's Home Page

---

E-Mail the Author

---

Name:Bill K URL: http://192.197.62.35/cgi-bin/MCSELE/gbmcsele.cgi
Email: billk679xxx_at_xxxgmailxxx_daught_xxxcom
Location: Pinellas, Fl US
Date: Friday, December 16, 2011 at 13:40:28
Comments:

Great site I want a page just like it please contact at billk679@gmail.com

---

Name: Ken Lloyd
Email: jklloyd09xxx_at_xxxsympaticoxxx_daught_xxxca
Location: Oakville, ont can
Date: Monday, December 12, 2011 at 21:04:40
Comments:

Would you like to be part of the 100 year celebration of Military Signals in Hamilton. Our project for both land and sea is the role of Stephenson and the Enigma. We should be able to borrow one. Best wishes, Ken Lloyd President Hamilton Signals Association and President of Friends of HMCS HAIDA. 905 825 9898

---

Name: Linda
Email: lindarachelxxx_daught_xxxsxxx_at_xxxgmailxxx_daught_xxxcom
Location: Chula Vista, CA USA
Date: Thursday, December 8, 2011 at 17:15:05
Comments:

Very nice site Mark! Thanks! lindarachel.s@gmail.com

---

Name: James
Email: cynikntxxx_at_xxxgmailxxx_daught_xxxcom
Location: San Diego, CA USA
Date: Tuesday, November 29, 2011 at 01:08:55
Comments:

Cool site bro! cyniknt@gmail.com

---

Name: Max
Email: maxschellgamexxx_at_xxxgmailxxx_daught_xxxcom
Location: Los Angeles, CA USA
Date: Saturday, November 26, 2011 at 17:15:05
Comments:

After browsing around your site, I really like the content. This is awesome! maxschellgame@gmail.com

---

Name: Rajiv
Email: rjvgupta850xxx_at_xxxgmailxxx_daught_xxxcom
India
Date: Tuesday, October 25, 2011 at 01:07:35
Comments:

Bless to all.

---

Name: Richard Hoskin
Email: cornishchroniclexxx_at_xxxgmailxxx_daught_xxxcom
Location: California, KY USA
Date: Tuesday, October 18, 2011 at 14:30:24
Comments:

Fascinated to look at your pictures and read your descriptions of the Newcomen steam engine. Do you know of accidents with serious injuries or fatalities? I'm looking for authentic descriptions, for my historical novel set in my native Cornwall in the C18th. Thanks!

---

Name: Adam F
Email: adamxxx_daught_xxxdent77xxx_at_xxxgmailxxx_daught_xxxcom
USA
Date: Friday, September 16, 2011 at 15:41:11
Comments:

I'm quite jealous Prof. your degrees are impressive, the force is strong with you!

---

Name:honora pearls URL: http://www.honorapearls.net
Email: teskonxxx_at_xxxgmailxxx_daught_xxxcom
Location: bandung, indonesia
Date: Friday, July 22, 2011 at 05:50:36
Comments:

that is very awesome

---

Name: Nicholas Bodley
Email: nbodleyxxx_at_xxxspeakeasyxxx_daught_xxxnet
Location: Waltham, Mass. USA
Date: Tuesday, April 26, 2011 at 21:37:46
Comments:

Just a quick one: My long message was carefully prepared with blank lines and short paragraphs. Something happened! It's one gigantic paragraph! Ouch!

---

Name: Nicholas Bodley
Email: nbodleyxxx_at_xxxspeakeasyxxx_daught_xxxnet
Location: Waltham, Mass. USA
Date: Tuesday, April 26, 2011 at 21:34:39
Comments:

Mark, Had a delightful time browsing various parts of your Web site. I was born early in 1936, before miniature tubes came on the market. I'm so glad to read of your many successes, and the other kind, from which we learn (or should). I built a radio at age 6, and carelessly/accidentally connected the B battery to the filament circuit. The short-circuit current of a good 90-V B battery will burn out 1.4-V heaters before your reaction time makes you disconnect. Had better luck, later, with a 6-tube Meissner kit. I built the Popular Science "Cigar Box Tesla Coil" (ca. 1952) as a high school shop project. Was quite a nice job, physically, but when powered up, the top terminal didn't have a spark to a handheld screwdriver blade. What the article omitted was some essential info. that I didn't know at the time: The tall secondary has to have a self-resonant frequency close to that of the primary RF. There was too much of a frequency mismatch, and no variable capacitor to tune the (tube) oscillator. Won Hon. Mention in the Westinghouse National Science Talent Search in high school; probably helped me to get accepted at Princeton. Lasted for one term, and spent many decades figuring out what went wrong. Enlisted in the Navy, and became a fire control tech. Was fascinated by the Mk.1A mechanical #$*!%og f.c. computer; at long last, docs are appearing online. in 1960, I was a midnight hacker on the Display Info. Processor at the NORAD COC in Colo. Springs (before it went under the mountain). The DIP (19-bit word length; afaik, unique) was ready to go a few weeks ahead of schedule. Yrs trly asked permission to learn it better after hours, and that was OK with RCA Service Company and NORAD. Only proviso was that I had to be bright-eyed and bushy-tailed next morning. Hop et ask the USAF for permission to write up the machine. Around 1963, I think, I became one of the first eight (afaik!) electronic desktop calculator techs in the USA, on the Friden EC-130. Remarkably-ingenious architecture which I wrote up years ago; it's on several calc. sites. Was a non-degreed engineer at Friden R&D in Rochester, but I was politically naive. Was involved with Moog and Arp synth. hardware starting right after W. Carlos' Switched-on Bach came out; hearing it was a profound and happy experience. Taught synth. at the New School in NYC to anyone interested for a spell. Left the field when polyphonics were starting to come on the market. I think you'd be interested in the old #$*!%og fire-control computers. The mechanical schematic for the Mk. 1/1A is roughly two feet high and maybe 5 feet wide (rough estimates, no fish story). It contains about 160 miter-gear differentials -- that gives some idea of its complexity. Although I've always had some interest in mechanical calculators, a few years ago the Web started to have considerable technical detail, and I have been repeatedly delighted to learn about them. By now, I think I know just about all the basic mechanisms, and they are interesting. (How about a mechanical "ROM" for a fast multiplier?) I have just a few. They are notably interesting, especially the Marchant, an awesomely sophisticated design that was twice as fast as any other until (probably) the last of the Monroes, a printer. The Marchant has a full keyboard, usually ten columns. Every column has a nine-ratio preselector "transmission" so that the speed of that column's dial in the carriage is proportional to the number keyed in. The 20-digit accumulator contains 39 spur-gear differentials. (Oodles of gears!) Quite remarkable is that it contains a multi-digit mechanical /#$*!%og/ magnitude comparator to speed up division. (It anticipates overdraft, and afaik avoids it when properly adjusted.) Simplicity is not one of its strong points. See John Wolff's pages: That green one, top middle, is a Marchant. the one to its right must be a Friden EC-132, which does square root using a clever algorithm. John has several splendid teardown/rebuild photo series of a number of machines (incl. a Marchant); these are absolute must-see; time sink warning! The IBM Selectric typewriter is notable for having a lot of mechanical binary mechanism internally. The ball is positioned by two mechanical digital-to-#$*!%og converters. As you probably realize, the typewriter is entirely mechanical, save for the drive motor. I was also a Flexowriter mechanic, just enough to have a legit. claim. I'd commend to your attention Brian Conlon's Web site about the Australian electromechanical race track totalisators. In one installation, iirc, the whole system was handling, at peak betting sales, 250,000 real-time financial transactions per minute. No electronics at all. In a sense, the systems were huge 3-D structures built of smaller units, all interconnected. Time sink warning! I've also taught myself a bit of horology; as a kid, friends and neighbors gave me clocks and watches that didn't work. Along the way, I bought a complete Amiga 1000 system, which i still have, and want to give away. It's early enough not to have Extra Halfbrite. Have maybe 150 lb. of docs and magazines. Printer is a Seikosha MP-1300AI, selectable charset; was one of the first to have ISO 8859-1 internally. Pretty sure it's a 9-pin variety. Does color, but the ink colorimetry is horrible. I also have the Sony KV-1311 TV/monitor; it's still in fine condition, because I don't watch TV. Would be glad to see it in a good home. For many years, I have been a member of the CALCLIST-L at Technion in Israel; a new list has been established, and is doing well. I've written for both lists. However, my first love among mailing lists is Howthingswork@yahoogroups.com, where I've written rather extensively no the history of technology; in recent years, I've put the word "histech" into the Subject field if there is anything significant in the message. I also have supplemented a number of articles in Wikipedia (and even rewritten parts of some). I take a slightly perverse pleasure in copy editing. My father was a steam engine enthusiast; when I was a toddler, we visited the Boston sewage pumping station and the Chestnut Hill city water pumping station; both had steam engines running. As well, I can remember, alos asa toddler, watching a steam shovel (unsophisticated geometry!) excavating. At home, we had a couple of Weeden engine/boilers, which I enjoyed. My father was a Reg'd. Prof. Engineer (mechanical) in NY state; he worked for G.E. via a subcontractor on power station design; did piping layouts, because he had an exceptional 3-D sense. He brought home advertiser-supported periodicals for me, and sent in bingo cards, returns from which I learned quite a bit. One day, I was perusing a new-products tabloid-format monthly, and there was a small item with a really-interesting headline that said a coherent visible light source was now available. From studying the MIT Radiation Lab. Series in high school, I knew "coherent" was something significant. (It was a Hughes ruby laser. The b&w photo showed a helical flashtube with a transparent shiny rod in the center, supports air-brushed out.) Best regards, indeed; I surely hope to return and browse further, and would be glad to correspond by e-mail. Plainly, we have a common interest in the history of technology.

---

Name: Krista Bruno
Email: mkworksxxx_at_xxxsympaticoxxx_daught_xxxca
Location: Thornhill, Ontario Canda
Date: Friday, April 8, 2011 at 11:15:07
Comments:

Hi Mark. NMy mother told me a kid with your last name won the Science Fair in Niagara. Figured brains (and winning science fairs)run in your family and she had to be yours. Wow! Sound like you are doing well. And as for your blog comment that you did "ok" in school...well, I seem to recall that you were an outstanding student. Congratulations to you (and your daughter). regards, Krista

---

Name:James T MD URL: www.mtintouch.net
Email: hastigoxxx_at_xxxgmailxxx_daught_xxxcom
Location: Reed Point, MT USA
Date: Friday, April 1, 2011 at 13:31:12
Comments:

Hey Prof... Gotta love these 'internets' and... the generous souls who share with us their passions which finds us stuff never before -ever - remotely findable. So - On discovering a working speaker in my little -long since 'relegated'- 1970s metronome kit and thinking to convert it to an 8 ohm audio amp and drawing out a schematic BUT having no idea of that which actually composed any sort of (preferably transformered) amp: I went looking and found your lovely contribution(s) which proved so informative (and cool). But then came to wonder then if you've a schematic for an modest little amp which might reuse as many of the metronome parts as possible? [for the sake of frugality if nothing else]. Did copy off the 'OTL' amp info but of course IT abjures any transformer. My own background was 6613~Avionics in the Marines where we worked on the first fire-control processors for the F3D night-fighter (and ended up in Medicine)..but never lost an interest in these basic electronics and the magical things they can do. Thanks so very much...this was total fun! cheers James T MD/MT

---

Name:Pete Pifer URL: Www.etisoftware.com
Email: Ppiferxxx_at_xxxetisoftwarexxx_daught_xxxcom
Location: Norcross, GA US
Date: Wednesday, March 16, 2011 at 20:29:09
Comments:

I was an executive with MA/Com when they acquired OS and quickly managed into the ground. An amusing story in itself, but as part of the staff there, we acquired a Challenger II 4P and a box of floppy discs with all sorts of applications from accounting to games. I have kept these items in my possession since then (around 1981) but thought they might be of some value to a collector as an antique item. My hobby is barbershop quartet and collecting old cars starting with a 1959 Jag XK-150 Open Two Seater (OTS). Any idea of how to sell these items off or their value? Thanks, Pete Peter M. Pifer Chairman & CEO ETI Software Solutions

---

Name:Gary Preston URL: att
Email: prestongaryxxx_at_xxxattxxx_daught_xxxnet
Location: North Royalton, Ohio USA
Date: Tuesday, February 22, 2011 at 11:14:55
Comments:

I am a very interested in Niagra falls and Tesla, And meny other old turn of the century electrical stuff; I am 69 and have worked with this all my life ; Would love to tour the hydo plants at the falls

---

Name:<asdfasdf>asdf URL: <asdfasdf>asdf
Email: <asdfasdf>asdf
Location: <asdfasdf>asdf, <asdfasdf>asdf <asdfasdf>asdf
Date: Friday, December 24, 2010 at 11:05:26
Comments:

<asdfasdf>asdf

---

Name:asdfasdf URL: asdf.com
Email: asdfxxx_at_xxxasdfxxx_daught_xxxcom
Location: asdfasdf, asdfasdf asdfasdf
Date: Friday, December 24, 2010 at 11:04:54
Comments:

asdfasdf

---

Name: Diane
Email: dianexxx_at_xxxbeadgirlxxx_daught_xxxcom
Location: Akron, OH USA
Date: Tuesday, November 30, 2010 at 07:59:37
Comments:

Thank you kindly for your kifli recipe! It was the first I found through Google and was the best. I made them for the first time last night, and I am no baking expert. They came out great! I am sharing today at work and will make them for Christmas. My dad (the Hungarian side of my family) and mom (the Slovak side) are both looking forward to them this year! Thanks again, and I wish you the best!

---

Name: Iskeel Sadiq
Email: iskeel1xxx_at_xxxyahooxxx_daught_xxxcom
Location: Abuja, FCT Nigeria
Date: Monday, November 29, 2010 at 04:16:53
Comments:

Sir, I love your courage and motivation. I need your help with enough materials on the PhD Topic i am proposing. "Design and Implementation of Hybrid Multilevel inverter in Grid Connected photo-voltaic system". Sir, in this research proposal, i intend to design and construct a 5kVA to be able to carry out thorough Methodology, #$*!%ysis and conclusion on this Multilevel inverter. Waiting for your professional advice and response.

---

Name: Dude Link
Email: rcciixxx_at_xxxlivexxx_daught_xxxcom

Date: Monday, November 8, 2010 at 18:46:23
Comments:

This is a very nice site. It's important that everyone should get an education. rcspammer@gmail.com

---

Name: Danielle Roark
Email: danielleroark8xxx_at_xxxgmailxxx_daught_xxxcom
Location: Wayne, MI USA
Date: Friday, November 5, 2010 at 21:00:38
Comments:

I love this site. -Danielle danielleroark8@gmail.com

---

Name: K.Natatrajan
Email: remnatxxx_at_xxxgmailxxx_daught_xxxcom
Location: Trivandrum, Kerala INDIA
Date: Friday, October 29, 2010 at 06:26:59
Comments:

I found your site very interesting and informative as I am a fan of LASER. I would like to know something about microwave oscillators for RF capacitive discharge He Ne laser and in particular about the trigger or laser discharge initiation mechanism - what is the trigger voltage for break down and how can it be done. Thank you Warm regards, k.Natarajan

---

Name: Prof. Jaime Cascante
Email: jcascantexxx_at_xxxeiexxx_daught_xxxucrxxx_daught_xxxacxxx_daught_xxxcr
Location: San Pedro, San José Costa Rica
Date: Sunday, October 24, 2010 at 11:48:45
Comments:

I work in the University of Costa Rica. I'm a fan of photonics, I like to build "toys" and research applications. I coordinate the "young" Non Linear Photonics Research Lab (NLPRL) and collaborate on the LAFTLA.

---

Name: Keren Jones
Email: Kerenxxx_daught_xxxjonesxxx_at_xxxusaxxx_daught_xxxcom
Location: SLC, USA
Date: Wednesday, October 6, 2010 at 17:54:00
Comments:

Thank you, very nice

---

Name: Alec Tugev
Email: alec151512xxx_at_xxxgmailxxx_daught_xxxcom
Location: Aspen, CO USA
Date: Thursday, September 30, 2010 at 20:25:20
Comments:

Great site! Love it!

---

Name: Vincent
Email: vincentxxx_daught_xxxfoucrayxxx_at_xxxgmailxxx_daught_xxxcom

Date: Thursday, September 16, 2010 at 08:16:22
Comments:

Very nice site, well done!

---

Name: Pat Carriere
Email: patcarrierexxx_at_xxxhotmailxxx_daught_xxxcom
Location: Barrie, ON Canada
Date: Tuesday, September 7, 2010 at 20:37:38
Comments:

Hi Mark, I just found yor page on CROR signalling. Very useful! I am currently building a virutal prottype railroad and it is very handy to understand signalling. You may be interested to know that last month while on the VIA transcontinental that I disocevered a new signal on the CN Main Line. Prior to reaching a siding, there would be an Advanced Clear to Stop. But there was also below it a flashing green arrow (just like at a street intersection). On my scanner, I heard the engineer call out "Advanced Clear to Stop - Take Siding Right" or something similar. I thought you would be interested. Cheers, Pat

---

Name: Norman King
Email: nosmok60xxx_at_xxxyahooxxx_daught_xxxcom
Location: Reno, NV USA
Date: Wednesday, September 1, 2010 at 04:03:41
Comments:

Great site, thanks and best wishes.

---

Name: Lee
Email: infoxxx_at_xxxleemarketingxxx_daught_xxxcomxxx_daught_xxxau

Date: Thursday, August 26, 2010 at 23:53:55
Comments:

Very informative site - I will call soon.

---

Name: Emil Jaquèche
Email: exxx_daught_xxxjaquechexxx_at_xxxwebxxx_daught_xxxde
Location: Luxembourg, LU Luxembourg
Date: Thursday, July 29, 2010 at 05:32:35
Comments:

Cool site that I found surfing through the web. I really enjoyed my stay here ... Go on like this ....

---

Name: Rose
Email: roseyjones12[_a_t_]yahoo[_daught_]com
UK
Date: Sunday, July 11, 2010 at 16:44:56
Comments:

Fantastic site. Very informative. Thank you.

---

Name: Robert Ferragne
Email: robert[_daught_]ferragne[_a_t_]tr[_daught_]cgocable[_daught_]ca
Location: Trois-Rivières, Québec Canada
Date: Thursday, July 8, 2010 at 08:53:13
Comments:

Bonjour monsieur Csele`s Merci d`abord d`avoir pris la peine de traduire mon message.Hé oui ,ici au Québec tout se passe en Français. Votre site est très à mon goût et je vous en félicite. Mes champs d`intérêt sont très semblable au vôtre ,ce qui fait mon très grand intéressement à vos réalisations. Même mon chat est un clone du vôtre ! Référence sur YouTube sous le pseudonyme de AUTOCINEMATON. Bien à vous. Robert Ferragne

---

Name:John URL: http://adgusto.com
Email: rentnet_org[_a_t_]yahoo[_daught_]com
Location: Marietta, Georgia USA
Date: Tuesday, June 8, 2010 at 04:04:24
Comments:

Mark, Thanks for sharing. Although, I'm interested in detecting electrostatic fields at present ( vector, range, character, etc. ) I view your site as a treasure reading about your Science Fair experiences and more. My junior high school days were more about developing rockets - learn, make, mistake, test, fail, learn more driven by the interest of results and making plain how it works. Later, early in high school did electronics kits, and making new things like [ homeostatic feedback staging ] - a seven stage #$*!%og loop feedback controller, binary JK Flip-Flops, then my sporatic interest in Science Fairs kick in. I won a few being more interested in building circuits to transmit, receive, test, and basically learn electronics. I think its great you generously share your projects. I haven't explored your temperature alarm circuit but will probably develop a controller for a water solar heat collector I am building using copper pipe, some fins, and putting it into a 4 by 8 foot plywood box covered in polycarbonate plastic to keep it warm. After I add an electric pump, one way valve, and some temperature recording and control to it, the practical tests begin. The project pays for itself and is not all that complex.

---

Name:Richard Denning URL: ruralfree.org
Email: rfd[_a_t_]ruralfree[_daught_]org
Location: Pearblossom, CA USA
Date: Sunday, June 6, 2010 at 12:27:46
Comments:

Elektor magazine had a short article about the OSI Superboard II (I still have an original Challenger 4P), and after an irreversible chain of links I came to your site. I worked with PDP-8s for many years, and now I use PIC microcontrollers (with comparable computing power) in my work.

---

Name: Hagop B
Location: cant say, cant say
Date: Sunday, May 30, 2010 at 19:43:25
Comments:

it is a nice site i like it very much ...you wont believe were i am from !!!!!!!!!!!!!!! i wrote Hagop B duo to the fact that my last name is hard to read

---

Name: Chris
Email: topherbyte-music[_a_t_]yahoo[_daught_]com
Location: Menlo Park, CA USA
Date: Tuesday, May 25, 2010 at 14:58:24
Comments:

Mark, you have excellent taste in music. I stumbled across your site while trying to find out who the members of Voice of America were. I am still stumped on that. Consider adding "Voice of The Beehive -- I Say Nothing" to your list.

---

Name: Kevin Zeoli
Email: kevinzeoli[_a_t_]hotmail[_daught_]com
Location: Thorold, Ontario Canada
Date: Wednesday, May 19, 2010 at 07:25:59
Comments:

Cool and informative site.

---

Name:AKPOLILE ANDREW URL: www.yahoo.com
Email: akpodan2001[_a_t_]yahoo[_daught_]com
Location: ikeja, lagos ikeja nigeria
Date: Thursday, May 13, 2010 at 11:16:03
Comments:

Good day sir. sir please i need your help on design and construction of a 2kva ups. please you can seed your reply to my e-mail address akpodan2001@yahoo.com

---

Name:AKPOLILE ANDREW URL: www.yahoo.com
Email: akpodan2001[_a_t_]yahoo[_daught_]com
Location: ikeja, lagos ikeja nigeria
Date: Thursday, May 13, 2010 at 11:06:25
Comments:

hi sir you have a great site.sir please i need your help on design and construction of a 2kva ups

---

Name: Baijunath g
Email: Baijugnathanatha[_a_t_]yahoo[_daught_]com
Location: cochin, keralam india
Date: Tuesday, May 4, 2010 at 13:21:50
Comments:

I Wanted a 16f72 used pure sine wave inverter fully automatic (asm or hex)sorce code.and pin detail of 16f72 in hex and asm. please send me again in my Email Baijugnathanatha@yahoo.com

---

Name: Baijunath g
Email: Baijugnathanatha[_a_t_]yahoo[_daught_]com
Location: cochin, keralam india
Date: Tuesday, May 4, 2010 at 13:20:10
Comments:

I Wanted a 16f72 used pure sine wave inverter fully automatic (asm or hex)sorce code.please send me again in my Email Baijugnathanatha@yahoo.com

---

Name: Lindsay Newton
Email: lindsay[_daught_]newton[_a_t_]xtra[_daught_]co[_daught_]nz
Location: Nelson, New Zealand
Date: Thursday, March 11, 2010 at 05:00:36
Comments:

To Mark, Great web site! I am working on a project that uses D.C. to produce a plasma on an electrode underwater.Problem: electrode oxidises away in high temps. 4000c. Can lasers be used to activate a plasma underwater to replace the electrode? I note that NIF have used multiple intense beams for inertial confinement fusion to do this.This is way out of my understanding, so I am looking for a knowing person to adise and perhaps join a very exiting project. go well. Lindsay

---

Name: Ralph Jamison
Email: rajamison[_a_t_]optimum[_daught_]net
Location: Eastport, NY USA
Date: Thursday, March 4, 2010 at 12:55:38
Comments:

I would like to send you a more detailed email if you would like to reply to this. My interests = Nikola Tesla, MRR electronics,Air Force,Nuclear history,Old computers.etc I cant believe your interests are on the topics except the music. I am an old country music collecter. Regards, Ralph Jamison

---

Name: Josh Turner
Email: jturner7[_a_t_]asu[_daught_]edu
AZ
Date: Tuesday, January 19, 2010 at 15:08:34
Comments:

nice site

---

Name:Davis URL: http://nfo.atspace.com
Email: daviscarlod4[_a_t_]gmail[_daught_]com
Location: Dallas, Tx USA
Date: Saturday, January 16, 2010 at 12:42:09
Comments:

Nice site thanks

---

Name: Tomas
Email: fandangodecandil[_a_t_]yahoo[_daught_]com

Date: Saturday, January 2, 2010 at 05:44:22
Comments:

Dear Mr. Csele: I read with a great deal of interest your essay on Electromechanical Telecommunications Switching! You are a true Professional of your field and I give you an A+++ on your knowledge! Bravissimo!!! -Tomas-

---

Name: JAY MILLS
Email: mieco[_a_t_]verizon[_daught_]net
Location: WILMINGTON, DE USA
Date: Wednesday, October 14, 2009 at 18:43:23
Comments:

Mark, how are you, I have a, or should I have a few, M8047-AA from a PDP 11/23 needing repair, I found your page by doing a search for schematics for the M8047-AA board, as you most know I didn't have any luck however after finding your page I have a little hope thinking you may be able to help. I still remember the day I rolled a whole, like new, PDP 11/23 through the Dupont shop where I worked & out on the dock & just pushed it off in the dumpster, what a waste....

---

Name: Mike
Email: vargusvargus[_a_t_]gmail[_daught_]com
usa
Date: Tuesday, September 29, 2009 at 22:18:51
Comments:

Super site, very informative. vargusvargus@gmail.com

---

Name:Mike URL: www.RadioShackCatalogs.com
Email: rscatalogs[_a_t_]gmx[_daught_]com
Location: Chicago, IL USA
Date: Tuesday, August 4, 2009 at 22:52:05
Comments:

Hi Mark: Thanks for including my website, www.RadioShackCatalogs.com, on your site. I've enjoyed reading your site. You've got quite a background in science & electronics....COOL STUFF! And just like you, (and I'm sure many others), I used to spend HOURS reading, studying, absorbing & dreaming about the items in those old RadioShack catalogs. It's funny that you would mention the P-Box kits you got for Christmas. I've always said that the best Christmas gift I EVER received was a 75-in-1 Electronic Kit from Radio Shack. This kit was similar to the P-Boxs but used springs to attach the wires to the components. I still have it....somewhere. That's about it for now. Just thought I'd sign your guest book and say "hello". ~ Mike

---

Name: Nestor A. Parayno
Email: nestor[_daught_]parayno[_a_t_]toyota[_daught_]com[_daught_]ph
Location: Sta. Rosa, Laguna Philippines
Date: Sunday, August 2, 2009 at 21:35:29
Comments:

I am very interested in your 2K inverter which can power a 1/3 horsepower electric motor. Could you kindly sent me a copy of the electrical circuit diagram and PCB lay-out. Thank you very much

---

Name: JOHAN VENTER
Email: JOHAN[_daught_]VENTER[_a_t_]GIJIMA[_daught_]COM
Location: JOHANNESBURG, SOUTH-AFRICA
Date: Tuesday, July 21, 2009 at 04:22:57
Comments:

Subject: HIGH POWER BACKUP INVERTER Good day Professor I would like to obtain the pcb design(artwork)for the high power backup inverter if possible It is a great project..and I would like to construct this project for my own use..due to lots of power-failures

---

Name:Forrest M. Mims III URL: http://www.forrestmims.org
Email: forrest[_daught_]mims[_a_t_]ieee[_daught_]org
Location: Seguin, Texas USA
Date: Thursday, May 28, 2009 at 13:54:47
Comments:

Great web site--especially the Science Page at http://technology.niagarac.on.ca/people/mcsele/science.html Canadian Ralph Coppola links to your site in his "Wanderings" column in the forthcoming June 2009 installmnent of The Citizen scientist (www.sas.org/tcs) I wish more young people today were having the kind of hobby electronics experiences that you and I had. Fortunately, the robotics movement is helping out. Forrest M. Mims III www.forrestmims.org ww.sunandsky.org twitter.com/fmims

---

Name: Elaine DiMasi
Email: ElaineDiMasi[_a_t_]gmail[_daught_]com

Date: Tuesday, May 19, 2009 at 10:57:41
Comments:

Hi! I enjoyed seeing your OSI pages, it was tough for my Dad and me to throw away ours years ago, and I just checked and found that I still have the binder with the character graphics manual! I wanted to use the "airplane" characters as an avatar for something; had I not had it I'd have stolen your gif file instead. Best, Elaine

---

Name: Tommy T.
Email: akingson[_a_t_]aol[_daught_]com
Location: Darien, CT USA
Date: Saturday, May 16, 2009 at 19:26:30
Comments:

Love your PDP 11/34 page! Used one in 1979-1980 at my (well-funded) high school. I created password stealing programs and was "kicked off the system" for months at a clip. Still remember that ZIP program and the DELETE command. Kids hated me for deleting their entire accounts! I was bad. I was very good at BASIC programming as well. REM "This program was made in stealth."

---

Name: nicholas lenarz
Email: nlenarz[_a_t_]hotmail[_daught_]com
Location: alexandria, minnesota usa
Date: Monday, April 27, 2009 at 22:24:08
Comments:

I have a challenger c2 and would like to know if anyone is interested in it. Can I find a home for it?

---

Name: David Watson
Email: jaykaydeew[_a_t_]yahoo[_daught_]com[_daught_]au
Location: Mbeya, Tanzania
Date: Saturday, April 18, 2009 at 12:22:38
Comments:

Fantastic effort on Strowgers! heard these click clacking as a lad in '40s outside York UK phone exchange. Researching for my biography - far removed from hi tech in rural Tanzania . . . email slower than manual exchanges!!!l

---

Name: terry & kathleen swingle
Email: tk5667[_a_t_]hotmail[_daught_]com
Location: wauseon, ohio usa
Date: Sunday, April 5, 2009 at 22:10:04
Comments:

you have become my favorite web site

---

Name:C. BABU EBENEZER URL: findlove@freehosting.net
Email: cbabuebenezer[_a_t_]gmail[_daught_]com
Location: bangalore, Karnataka South India
Date: Sunday, March 22, 2009 at 13:40:37
Comments:

I visited your webpage. It is awesome. I appreciate your work. I am also working as a lecturer in Department of Electronics in Kristu Jayanti College. Bangalore - 77. My humble request is can you able to spend your valuable time with my students in video conferrencing. Please contact through mail. Iam waiting your response.

---

Name: Dr Evan Wasserman
Email: DrWass2[_a_t_]aol[_daught_]com
Location: Lakewood, NJ USA
Date: Sunday, February 8, 2009 at 21:11:40
Comments:

I have a BS in Physics but consider myself to really be an engineer. Wrote operating systgem code, drivers, data com, for a mini computer manufactuer then midlife crisis, now a Dentist. I too had (still have) a OSI superboard II. I just broke it out and it still works. I loved this machine in the late 70's. I made some interesting modifications. I designed a simple mod (Two TTL chips and 4 cut traces)which doubled the video display to 64 characters per line with only 16 lines per screen by doubling the character clock and stealing (interlacing)bytes from the line below and using a free running faster dot clock. Characters look much better and much easier to read due to the space between lines of character. Included a very short code sequence to handle it transparently to software including backspace. Even designed it so one can programtically turn it on or off by turning on a bit in the last byte of the video memory (needs an extra latch chip for this). Also wrote a very short code sequence which kept a digital clock readout at the end of the video display. used the 60 hz vertical synce signal to cause an interrupt. the interrupt code actually did the arithmetic in ascii on the display Ram itself. I just loved the way one could turn on these old machines and write some code in "simple" basic and get an answer. The original idea of basic was to allow one to very simply write a program. By the way, the basic in the Ohio Scientific Machines is MicroSoft Basic....interesting! I also love the pic chips and like to make all kinds of little electronic projects.

---

Name: Peter Geisler
Email: petergeisler[_a_t_]hotmail[_daught_]com
Location: Neundorf, Sachsen-Anhalt Germany
Date: Saturday, January 31, 2009 at 06:42:01
Comments:

Dear Sir, you have opened a wonderful way for me to study the programming of your nice builded temperature controler with the PIC 16F84. I'v build it with your code and my changes to make it running on a 16F877 PIC processor. I was a hard work, but now it's finished. Thank you so much for your really good commented program. I'v learned so much that my books cannot compare which I'v read before. sincerely Peter Geisler / Germany / old student with age of 64 :-)

---

Name: Peter Dubrovsky
Email: d-pi[_a_t_]yandex[_daught_]ru
Location: St. Petersburg, Russia
Date: Friday, December 19, 2008 at 05:28:06
Comments:

Dear Sir! You wrote: “The water pump which this engine drove was two-stage. One stage of a pump of this kind can only be used to lift water 32 feet so two pumps are used here to allow water to be lifted up to 64 feet from the bottom of a mine” (http://inventors.about.com/gi/dynamic/offsite.htm?site=http://technology.niagarac.on.ca/people/mcsele/newcomen.htm ) I don’t believe. Because earlier you have written: “I was told by a visitor to this site (Richard Holliday), who lives in the area, that the mine was about 200 feet deep” 64-feet water pumps can’t work in 200-feet mine! Can you describe a design of the water pump more in detail? It would be desirable to specify its sizes and characteristics. And also to describe or give figures of valves (of these pumps). Yours sincerely, Peter Dubrovsky, St.-Petersburg, Russia. d-pi@yandex.ru

---

Name: abd rahman tamuri
Email: rahman_t[_a_t_]hotmail[_daught_]com
Location: Johor Bharu, Johor Malaysia
Date: Thursday, December 4, 2008 at 02:30:23
Comments:

I am very happy with your website...Thank you

---

Name:Agus Haeruman URL: agushaeruman.co.cc
Email: agus[_daught_]haeruman[_a_t_]gmail[_daught_]com
Location: Jogja, Jogja Indonesia
Date: Thursday, November 27, 2008 at 07:08:54
Comments:

Hello Sir, It's nice to see your site. I'm a student in Gadjah Mada University - Indonesia. My Subject is in Electronics & Instrumentations, so your site is very useful for Me. Thank you very much, and never end to make a great thing Sir ! You and your family are so inspiring Me! Best Regard, Agus

---

Name: DJ David D
Email: danenhod[_a_t_]lawrence[_daught_]edu
Location: Chicago, IL USA
Date: Wednesday, October 15, 2008 at 02:50:48
Comments:

Great information, very through. The 80's paved the way for some of the greatest electronic groups to date. Prof. - you give me much needed background information to complete my newest house album. You're the man Mr. P - take care! DWD

---

Name: monrak
Email: monrak_s[_a_t_]hotmail[_daught_]com
Location: muang, phuket thailand
Date: Friday, September 19, 2008 at 02:21:20
Comments:

Dear sir i have interested 2kw inverter project from yourwebside and i have a question about it,that circuit it posible to work in 220vac/50hz Regard

---

Name:Paul URL: www.familyshoecenter.com
Email: pgmuller[_a_t_]aol[_daught_]com
Location: Grand Rapids, MI US
Date: Sunday, September 7, 2008 at 16:44:30
Comments:

Hi Mark...Stumbled across your site when I was wondering if anything OSI was selling on Ebay...Did a Google search and found your site...My first computer was an OSI, and I have a bunch of old OSI 500 boards and related stuff...I also grew up and own a 95 year old family shoe business...let me know if you are interested in my sending you a list of OSI stuff I have, or what specifically you are interested in. Thanks for the web site. Paul KB8OE

---

Name: Denis Davidson
Email: dmdavidsn[_a_t_]rogers[_daught_]com
Location: Ottawa, ON Canada
Date: Friday, September 5, 2008 at 20:00:55
Comments:

Ex Military. Installed telephone Exchanges for UN forces in Egypt (1960) following the 1956 war. Took courses on Automatic Electric Strowger Systems in 1963. I'm looking for a copy or photo copy of the Automatic Electric Line Finder, Selector, and Connector. Can you help. Denny (By-the-by the no spam secutity code you asked for was in fact my MOC in the Forces)

---

Name: kchegwin@googlemail.com
Email: kchegwin[_a_t_]googlemail[_daught_]com

Date: Friday, August 15, 2008 at 14:36:28
Comments:

great site

---

Name:B.S.Jaswal URL: M/S AUTORONICA; 403 Indl. Area; Phase-2
Email: bsjaswal[_a_t_]autoronica[_daught_]net
Location: Panchkula, Haryana India
Date: Sunday, July 27, 2008 at 03:41:23
Comments:

God Bless You. I am 67 retired Marine Engr. The only desire I have now left in my life is to learn Software Programming in C language. I really do not want to die without learning SOFTWARE language and have great desire to make FEW products "Second To None" for the use of generations to come. Kindly Help me if You can show me easy & shortest path to learn this technic. With High Regards.

---

Name: Steve Pirosko
Email: pirosko[_a_t_]sympatico[_daught_]ca
Location: Niagara Falls, On Canada
Date: Thursday, June 5, 2008 at 22:46:04
Comments:

Ernie's Shoes! Pink candied popcorn and all. I was simply searching for railway signals, got into this site, and memories of old downtown Welland. You weren't raised in Welland if you did not get your first pair of real shoes from Ernie. You dad is an icon to this day for my generation. Thanks!

---

Name:ABA IMO URL: www.ase.com
Email: ABA[_a_t_]yahoo[_daught_]com
Location: ABA, IMO OWERRI
Date: Tuesday, May 13, 2008 at 05:55:06
Comments:

I LOVE THE PAGE SO CARRY GO.

---

Name: Sharon
Email: smrf69[_a_t_]gmail[_daught_]com

Date: Wednesday, May 7, 2008 at 14:04:26
Comments:

Thanks!!!

---

Name: Dr. Thaddeus Phist, M.S.E.
Email: mgads[_a_t_]hotmail[_daught_]com

Date: Monday, May 5, 2008 at 16:40:00
Comments:

Love your informative site! Can I donate funds somehow to your cause? mgads@hotmail.com

---

Name: chandrashekhar
Email: cs_kulkarni[_a_t_]rediffmail[_daught_]com
Location: Mumbai, INDIA
Date: Sunday, April 20, 2008 at 12:12:53
Comments:

Thanks professor for putting nice info,inspiring site

---

Name: Matt Ballinger
Email: mballinger1234[_a_t_]gmail[_daught_]com
Location: Austin, TX USA
Date: Thursday, April 10, 2008 at 17:25:38
Comments:

Awesome site, I'll definately be back, keep updating!

---

Name:linux user URL: http://www.redjuju.com
Email: rod[_daught_]huffaker[_a_t_]gmail[_daught_]com
Location: phoenix, az usa
Date: Thursday, April 10, 2008 at 12:13:28
Comments:

Great site with lots of good info. Thanks.

---

Name:Abdul Majeed Tahir URL: in construction
Email: amtahir786[_a_t_]yahoo[_daught_]com
Location: Jhelum, Punjab Pakistan
Date: Wednesday, April 9, 2008 at 13:23:06
Comments:

Sir, I have seen 2k inverter ineed complete pars list beacause i m confused with some thing mentioned in schematic as like in schematic what is in5359 24vzener "qty12" so please what is qty12 or how these 12 nos will be solder in serios or in paralal? Thank you for great and kinde attantion

---

Name: jeremiah lazaro
Email: jeremiahlazaro[_a_t_]yahoo[_daught_]com
Philippines
Date: Wednesday, March 12, 2008 at 06:14:55
Comments:

sir i really need the complete pcb format...pls send it to my e-mail...pls..and other information about your pic-based elevator such as its limitation and scope...we make it as our thesis project...

---

Name: jeremiah
Email: jeremiahlazaro[_a_t_]yahoo[_daught_]com
Philippines
Date: Saturday, March 8, 2008 at 03:08:48
Comments:

hi prof i read about your pic-based elevator..i want more information about the pcb image,part-list of component used and description..please sir we need it to our school project...thank you....

---

Name: Catrina
Email: dmntdpngwn[_a_t_]yahoo[_daught_]com

Date: Thursday, March 6, 2008 at 21:33:29
Comments:

I love your page! I found your page on the Newcomen steam engine invaluable for a paper I'm writing on the internal combustion engine.

---

Name: Tawney & Regina Pauoling
Email: paulingt[_a_t_]elmhurst[_daught_]edu
Location: hanover park, IL
Date: Tuesday, March 4, 2008 at 14:51:14
Comments:

YOUR SITE WAS A VERY BIG HELP IN EACH ONE OF OUR PAPERS THAT WERE BASED ON THE BRITISH INDUSTRIAL REVOLUTION. WE SITED YOU AND YOUR WEBSITE IN OUR PAPERS IN THE PROPER PLACES TO GIVE YOU CREDIT. SO WE JUST WANTED TO SAY THANKS

---

Name: C.V.R.NARAYANA RAO
Email: cvrnarayana[_a_t_]gmail[_daught_]com
Location: GUNTUR, ANDHRA PRADESH INDIA
Date: Tuesday, March 4, 2008 at 05:08:27
Comments:

I could not get any of the specified project contents of your excellent article 2K Inverter. I want to build this project for my own purposes. Please help me, how can i contact you or how can i get it from your web site, if your permit me to build this project. Please reply at your earliest possible time. with regards, C.V.R.NARAYANA RAO,INDIA

---

Name: Sheikh mohammad mohibur rahman
Email: emilon[_a_t_]gmail[_daught_]com
Location: Chittagong, Bangladesh
Date: Monday, March 3, 2008 at 07:22:38
Comments:

I'm very much interested to contact with you. I'm also making laser text display buy small with pic16f628 If you give me your email address i'll send that project photo.

---

Name: C.V.R.NARAYANA RAO
Email: cvrnarayana[_a_t_]gmail[_daught_]com
Location: GUNTUR, ANDHRA PRADESH INDIA
Date: Sunday, March 2, 2008 at 08:46:51
Comments:

I am very much interested to build one of your project 2K Power Inverter for non commercial purpose i.e., my own use only.

---

Name: wan
Email: riedzuan_04[_a_t_]yahoo[_daught_]com
Location: bachok, kelantan malaysia
Date: Monday, February 18, 2008 at 23:03:21
Comments:

based on your project about temperature alarm..i don't understand one thing...what the function of variable resistor at ADC0831 and what the reference voltage??pls reply ASAP..thank you...

---

Name: wan
Email: riedzuan_04[_a_t_]yahoo[_daught_]com
Location: bachok, kelantan malaysia
Date: Monday, February 18, 2008 at 22:59:37
Comments:

nice work..thanks...

---

Name: Ruk
Email: Ruk[_daught_]Shambies[_a_t_]googlemail[_daught_]com

Date: Monday, January 14, 2008 at 03:44:57
Comments:

Very interesting read. thanks

---

Name: Ken Bowd
Email: kb[_a_t_]yahoo[_daught_]ca
Location: Barrie, Ont Canada
Date: Sunday, January 6, 2008 at 11:39:36
Comments:

Nice Site

---

Name: Chandukashyap
Email: kckashyap[_a_t_]gmail[_daught_]com
Location: Bangalore, karnataka India
Date: Thursday, November 22, 2007 at 23:38:53
Comments:

Your UPS seems to be of great intrest to me, i have developed some low power UPS my self, let me look in to your UPS and find out what upgrades are needed. Have a nise day KCK

---

Name: Harold Hawley
Email: hal698[_a_t_]gmail[_daught_]com
Location: Houston, Texas U.S.A.
Date: Friday, November 9, 2007 at 18:17:52
Comments:

Great Site! I know you have the answer to my question. If you have the time to answer please email me at hal698@gmail.com. I want to build a laser to fracture water.

---

Name: James Ugwuogo
Location: Waterloo, Ontario Canada
Date: Saturday, November 3, 2007 at 19:56:43
Comments:

I came across your site while researching on inverter designs...its was very inspirational....thanks a million times.

---

Name: James Ugwuogo
Location: Waterloo, Ontario Canada
Date: Saturday, November 3, 2007 at 19:56:01
Comments:

I came across your site while research on inverter designs...its was very inspirational....thanks a million times.

---

Name: Lee Buller
Email: k0wa _at_swbell[_daught_]net
Location: Newton, KS USA
Date: Monday, October 15, 2007 at 14:29:26
Comments:

I love the site on the Challenger 1P. First computer I had. Hooked it to my ham radio station. Wrote a CW and Radio Teletype program in 6502 code. Learned a lot. Brought back some great memories. Lee - Amateur Call: K0WA

---

Name: Martin Harris
Email: martinh[_a_t_]optiscan[_daught_]com
Location: Melbourne , Australia
Date: Friday, August 24, 2007 at 03:09:11
Comments:

Great site, Congratulations on the amount of work that you've put into it!

---

Name: Tareq Saad ALsaholie
Email: tareq_alsholie[_a_t_]yahoo[_daught_]com
Location: TRIPOLY, MALE LIBYA
Date: Sunday, July 1, 2007 at 06:21:33
Comments:

I WANT IMPROVE MY ABBILITY TO BE PROFECIONALL PROGRAMING OF AN at89c51 MICROCONTROLLER BY ASSEMBLER

---

Name: Tim
Email: tim[_a_t_]technilogic[_daught_]com
WA USA
Date: Saturday, June 23, 2007 at 20:14:00
Comments:

I'm doing some home-brew PIC design for my model railroad and find your DCC section very interesting. Thank you.

---

Name: chantal
canada
Date: Saturday, April 14, 2007 at 23:05:42
Comments:

I just wanted to thank you. For letting me finally find the name of the artist of one of my favorite songs from the eighties. It was Sherry Kean, I want you back. And my family and friends also thank you. They no longer need to endured me singing the chorus and doing the dance.I swear I've been looking for years.

---

Name:Michael Boldin URL: http://technology.niagarac.on.ca/staff/mboldin/
Email: mboldin[_a_t_]niagarac[_daught_]on[_daught_]ca
Location: Welland, ON Canada
Date: Thursday, March 29, 2007 at 09:30:47
Comments:

Mark, can you PLEASE PLEASE PLEASE teach DRFT1331 in the Fall term again??? Pretty please?

---

Name: celal saltik
Email: celalsaltik[_a_t_]yahoo[_daught_]com
Location: kirikkale, turkey
Date: Saturday, December 23, 2006 at 13:12:19
Comments:

Thanks for your helps

---

Name:EKESON GUYMAN URL: WWW.YAHOO.COM
Email: EKESONGUYMAN[_a_t_]YAHOO[_daught_]COM
Location: LOME, ANEHO TOGO
Date: Friday, December 8, 2006 at 04:28:10
Comments:

NICE SITE KEERP IT UP OK

---

Name: Win
Email: K9EMV[_a_t_]Hotmail[_daught_]com
Location: Indianapolis, IN USA
Date: Saturday, December 2, 2006 at 00:28:46
Comments:

Had OSI C4P with two disk drives. I wanted to computerize an office and had to write my own programs. My major program printed out to 8 pages. After completing the programs I used them to do the work of a secretary (who wanted to retire). Part of her work took three weeks each month. The computer did it all in an hour!!!! Still have a few disks (5 1/4) and would like to read them, but the c4p is long gone. If you have time, I would like to correspond with you.

---

Name: Pedro Oliveira
Email: oliveira322111[_a_t_]hotmail[_daught_]com
Portugal
Date: Friday, November 3, 2006 at 04:49:18
Comments:

Hello, i'm a portuguese student, and in a science project me and a few friends are trying to built a laser. I was wondering if you could help us, by sending some kind of toutorial?

---

Name: Karthik
Email: karthik[_daught_]upadhya[_a_t_]gmail[_daught_]com
Location: Bangalore, Karnataka India
Date: Saturday, October 14, 2006 at 06:52:26
Comments:

Hello i am doing my electronics and communication engineering right now and id like u to thank u for the information and pictures of the strwger selector on this website

---

Name: Ian Lutonsteel
Email: I_Lutonsteel[_a_t_]yahoo[_daught_]co[_daught_]uk

Date: Wednesday, October 4, 2006 at 06:27:51
Comments:

Very informative site!

---

Name: Lowell F Hammond
Email: LFHammond14[_a_t_]gmail[_daught_]com
Location: Ludlow, Vt USA
Date: Sunday, October 1, 2006 at 15:53:21
Comments:

My Dad and I and Grampa who bought it ran the Ludlow Telephone Co from 1920 to 1980 when We sold. I sure enjoy the site as I worked on all phases of Telephony from Climbing, Setting Poles, Iron Wire, and the very fasinating two Step CO's we had. Being new to the computor I am excited to see this History preserved !

---

Name: Horst
Email: dk3bm[_a_t_]darc[_daught_]de
Location: Minden, Germany
Date: Tuesday, September 26, 2006 at 07:58:42
Comments:

Hi Prof, stumbled into your page looking for information about lasers and enjoyed the complete homepage. Like a good book : Once you started reading it, you can't stop. Personally, I don't like the sounds of the 80's so much, but that's a matter of taste. I just wanted to comment the "B-Sides" - chapter. I'm not sure what is worse than "seasons in the sun", but it surely belongs into the Top Ten. Do you know the original ? It was written by singer/songwriter Jaques Brel from Belgium in '61, and if you have the chance to hear it or see him perform the song, you will see it in a different light. Of course, it's in French .... Forgot to say it's called "Le maribond" What they did to this song is what top guitarist Leo Kottke described as :"Using one of my favorite techniques: Taking a simple little melody and drive it into the ground !" We are experimenting with amateur radio via laser, and I'm glad that we could establish our first contact over 10 km with laser pointer diodes. Only problems were warm air bubbles, insects in the beam and mechanical alignment. If the beam hit, the S-meter went , so the next test should be at least at a distance of 20 km. I never expected that result. Best 73 from Germany Horst DK3BM

---

Name: Jim Jordan
Email: j8k3sp00n[_a_t_]gmail[_daught_]com
Location: Sacramento, CA USA
Date: Saturday, September 23, 2006 at 14:13:23
Comments:

Great page!

---

Name: Dr.maga
Email: mumu[_a_t_]mage[_daught_]com
Location: Lome, Togo
Date: Sunday, September 17, 2006 at 15:36:12
Comments:

gggggggggggggggggggg

---

Name:Chris Klinger URL: www.fotosoaqui.com.br
Email: chris[_a_t_]fotosoaqui[_daught_]com[_daught_]br
Location: Fortaleza, CE Brazil
Date: Thursday, September 14, 2006 at 20:30:41
Comments:

Fabulous site, Mark. Hat's off on the inverter design; the fact that you clearly spent many hours to make it, then to give it away to any and all who have a use is super. Best of luck to you, and may you never run out of projects!

---

Name: Steve Slimak
Email: slimak_s[_a_t_]hotmail[_daught_]com
Location: Alliance, Oh USA
Date: Wednesday, September 6, 2006 at 21:18:53
Comments:

Thanks for the trip down memory lane. My father opened his first computer store teaching BASIC and selling OSI. It's been a long time since I've seen the hardware, Thanks Agian. I believe I still have some 8" floppys hidden away.

---

Name:EZE URL: WWW.EZEAGO.COM
Email: EZEAGO[_a_t_]YAHOO[_daught_]COM
Location: OHIA, KRITTING USA
Date: Saturday, September 2, 2006 at 05:11:48
Comments:

I DON LAN DHERE KEEP OFF OOOOOOOOOOOOOOOOOO

---

Name: Bennopia

Date: Sunday, July 16, 2006 at 09:16:12
Comments:

Contrary to your 80's webpage, the HamsterDance website does exist! Check out www.hamsterdance.com. It even has an entry on wikipedia!

---

Name: Shain
Email: john_mirra[_a_t_]earthlink[_daught_]net
Location: Trenton, TX USA
Date: Saturday, July 15, 2006 at 17:16:43
Comments:

Love the site, it really quenches the thirst for knowledge.

---

Name: Bruce Woodhull
Email: bjwoodhull[_a_t_]msn[_daught_]com
Location: Alamogordo, NM USA
Date: Friday, July 14, 2006 at 08:19:37
Comments:

I'll be on your site all day. What a great place just to hang out and learn and compare notes.

---

Name: Neil
Email: Neil[_daught_]Anblomee[_a_t_]gmail[_daught_]com
Location: Starky, PA USA
Date: Wednesday, July 5, 2006 at 13:23:49
Comments:

Great site. Great life.

---

Name: KENNETH HICKFORD
Email: kennethhickford[_a_t_]tiscali[_daught_]co[_daught_]uk
Location: LONDON, ENGLAND
Date: Saturday, July 1, 2006 at 08:35:41
Comments:

WHAT AN INTERESTING LIFE YOU HAVE HAD SO FAR! WOW! YOU SEEM TO HAVE ALL THE ANSWERS I NEED!

---

Name: Robert I.
Email: ve4rai[_a_t_]rac[_daught_]ca
Location: Winnipeg, MB
Date: Thursday, June 15, 2006 at 23:57:25
Comments:

It is a pleasure to browse an updated website which contains mostly webmaster authored content. Enjoyed articles on 25 Hz generation and NMRA DCC. Will check back often Robert

---

Name: Johann Uys
Email: juys[_a_t_]centlec[_daught_]co[_daught_]za
Location: Bloemfontein, Free State South Africa
Date: Tuesday, June 13, 2006 at 09:39:06
Comments:

Hi There I noticed that the connections from the ADC to the PIC the CLK and DAT are swapped around looking at the Assembler code. Unless I am fast asleep. After having swapped them I can speak to the ADC but by dropping the input voltage to the ADC the PWM wave jumps from narrow to wide instantly at the threshold. There is no slow adjustment with load or voltage drop. Am I overlooking something? If so please wake me up. Kind regards Johann

---

Name: Okufeso Olugbenga Olawale
Email: okufeso[_a_t_]yahoo[_daught_]com
Location: Anthony Village, Lagos Nigeria
Date: Sunday, June 11, 2006 at 09:12:41
Comments:

I sm into the design of power inverters ihave been able to design up to 7kva inverters on the square wave principles using sg3524n but i want to inprove on these by learnign to design modified squarewave which can be achieved by using the same ic but i don have the knowledge of how to design fillters, how to overcome crossover distortion in the driver section and ohters that might be needed to achieve this

---

Name: abdulsalam
Email: abu2005bakar[_a_t_]yahoo[_daught_]com
Location: LAGOS, NIGERIA
Date: Saturday, May 13, 2006 at 23:23:48
Comments:

iam very happy to visit your site, haven go through your biography ,ithink ihave hope for my fusure ,ishall very greatfull if you are les busy and can reply my mail whenever ineed your help in reserch thank God bless you more.

---

Name: Johann Uys
Email: plank[_a_t_]centlec[_daught_]co[_daught_]za
Location: Bloemfontein, Free State South Africa
Date: Friday, May 12, 2006 at 04:57:13
Comments:

Please keep me posted with further developments on your inverter. Thanks

---

Name: Johann Uys
Email: plank[_a_t_]centlec[_daught_]co[_daught_]za
Location: Bloemfontein, 9301 South Africa
Date: Tuesday, May 9, 2006 at 07:13:13
Comments:

I enjoy your articles and home page. Hoping for an upgrade of your inverter. SINE wave ??? Regards Johann

---

Name: KELE MIKE MAGAS
Email: magas[_a_t_]yahoo[_daught_]fr
Location: LOME, LOME TOGO
Date: Tuesday, April 25, 2006 at 06:08:05
Comments:

PLS STAY OFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

---

Name: Ken Pray
Email: kdpray[_a_t_]ns[_daught_]sympatico[_daught_]ca
Location: New Minas, NS Canada
Date: Monday, April 24, 2006 at 10:13:19
Comments:

During what period of time did conversion of household electricity from 25 cycle to 60 cycle take place?

---

Name: Evan Wasserman
Email: DrWass2[_a_t_]aol[_daught_]com
Location: Lakewood, NJ USA
Date: Saturday, April 22, 2006 at 23:22:12
Comments:

Came across your site doing a google search of "ohio scientific". I too had a C1P supper board in the late 70's. Only micro I could afford which had keyboard and everthing included. I made a few modifications which are very interesting. I too have dug my board out of storage and am playing around with it when I have time. My best modification was to double the characters accross the screen by interspersing characters from the line below. The result is very readable characters (better the original) with nice space between line in the vertical directions. Essentialy gives you a 50 by 15 display. 15 lines of 50 characters each. If I get a chance I'll try to get some pics of it. It is a very simple modification requiring 4 cuts traces and I even made it programble from software. I really should have sold this during the heyday. A simple hand coded piece of software is loaded in unused high memory and intercepts the output code and correctly displays all output. I eventually got a baudot teletype (55 baud) and used it for output (used a little ascii to baudot routine and bit banged it out the keyboard port). I wrote a 6502 disassembler is basic which I used to view the code in the roms. I also talked to some guys at OSI who described some of the rom routines and where to get and put parameters they required. This allowed me to write some interesing programs. I also picked off the vertical sync signal and fed it in as an interupt which was used to run a clock which kept time in ascii in the video ram. Another piece of pretty cool code. I wanted to build an expansion bus to a 44 pin backplane but never quite go around to finish it. A later addition wasa recieve only teletype (the one that uses the bouncing palete) using ascii at 150 baud. At the time, I was working for a minicomputer manufacturer (InterData later becoming Perkin Elmer). I then went to dental school and haven't done much since. I think the 6502 was a great little chip and now want to build some machines and have reactivated my OSI board. I have lots of OSI literature if you are interested.

---

Name: mugu lome
Email: mgbada[_a_t_]maga[_daught_]com
Location: lome, ghana togo
Date: Monday, April 17, 2006 at 16:08:44
Comments:

guys i don land hearrrrrrrrrrroooooooooooooooo

---

Name: Tri Cha^u
Email: chminhtri[_a_t_]yahoo[_daught_]com
Location: Nha Trang, khanh hoa Viet Nam
Date: Sunday, April 16, 2006 at 05:00:36
Comments:

I wandered by net for look any PIC idea implemented TMR0, and ADC,and found this website. Thank professor so much. Your biography remember my biographia, only difference that I am from Jungle :-).

---

Name: Bill Stevens
Email: bibmstev[_a_t_]computan[_daught_]on[_daught_]ca
Location: St. Catharines, ON
Date: Saturday, April 1, 2006 at 21:27:19
Comments:

Mark, It was a pleasure to speak to you at the Science Fair. Thanks for sharing your web site address .... It is a fabulous site! I am interested in local history and the pictures and articles are great and I'll be back!

---

Name: Milon
Email: milon_1125[_a_t_]yahoo[_daught_]com
Location: chittagong, Bangladesh
Date: Saturday, March 11, 2006 at 07:14:19
Comments:

Sir, u and your family are beautiful, i like electronics, I've done a lot of pic base microcontroller project. Regard Milon

---

Name: Penny Lorei
Email: penny
Location: Columbus, OH USA
Date: Monday, March 6, 2006 at 23:30:46
Comments:

Thanks for the article on Thomas Newcomen. Do you have any pictures or simple articles that would be helpful for my 10 year old daughter who has to write a report on him and create a display or poster for her homeschool co-op class on inventions? It is due March 21. if you can give me a safe way to send you our mailing address i'll send it...appreciate any help you can give us! going to Library tomorrow.

---

Name:Bill D. URL: http://home.cfl.rr.com/billd2000
Email: billdroadrunner[_a_t_]yahoo[_daught_]com
Location: Orlando, FL USA
Date: Thursday, March 2, 2006 at 13:21:45
Comments:

Hi all, I have a great website for all of you. First, I have a great insect page with photos of butterflies and other insects. I also have a great animated gifs page. My whole website is G-rated. I have other interesting website links such as "The Internet Movie Database"

---

Name:megat kurniawan URL: -
Email: moza2age[_a_t_]yahoo[_daught_]com
Location: Pontianak, KALBAR indonesia
Date: Wednesday, February 22, 2006 at 09:09:20
Comments:

Halo Mr i m from indonesia. I want to make elevator, after read you artikel. this is for my end project in high school. but i want make a at89c51 chip microcontroler. can you help me.

---

Name: Kiprotich Alfred
Email: alfronoh[_a_t_]yahoo[_daught_]com
Location: Nairobi, Kenya
Date: Monday, December 26, 2005 at 14:19:00
Comments:

I enjoyed your site and I have learned alot,Ill be communicating to ask you some few questions

---

Name:Odinn Thor URL: http://www.dxman.com
Iceland
Date: Sunday, December 25, 2005 at 22:29:08
Comments:

You have very good website here. I am glad to put my step in your guestbook. Welcome to my website as well Best greetings from Iceland http://www.dxman.com

---

Name: Milind ADbol
Email: milindadbol[_a_t_]gmail[_daught_]com
Location: Indore, M.P. India
Date: Sunday, December 25, 2005 at 13:45:45
Comments:

Please can you send me the building procedure of your spider robot

---

Name: M. Fenyvesi
Email: mfeny[_a_t_]yahoo[_daught_]com
Location: Ottawa, ON Canada
Date: Wednesday, December 21, 2005 at 10:33:37
Comments:

Hello Mark, Congratulations and thanks for the great site. I was quite amused by the kifli recipe. My background is Hungarian and I should know how to make kifli but I dont kow everyting!:) Your diagram was most helpful to explain to me how best to do the rolled up kifli. I was looking for the crescent shaped kifli that is simpler to make. I am usually reluctant to leave a note in anyone's guest book but I feel quite reassured that I wont get spams from your site. Best Regards, Maria

---

Name:max URL: http://hem.passagen.se/communication/meny.html
Email: maxit91[_a_t_]hotmail[_daught_]com
Sweden
Date: Saturday, December 10, 2005 at 16:32:16
Comments:

Hello and congratulation to a great homepage. I do enjoy your projects and I will read them all. Have a great Christmas and happy new year.

---

Name: VIC BIGLANG-AWA
Email: vicb888[_a_t_]yahoo[_daught_]com
CA USA
Date: Sunday, December 4, 2005 at 02:31:08
Comments:

Hello Prof Mark, Your articles are great! I specially like your web page re: Telephone Switches. Having worked as PABX technician for 17 years back home in the Philippines during the early 80's, I maintained several Automatic Electric Type 301 PABX systems that uses Strowger switches similar to step by step CO. I guess it's nostalgia but it is an eye opener for Telecom students who may never see an actual Strowger system that gave birth to automatic telephone calls. Best regards, Vic

---

Name: Dr Rob
Email: r[_daught_]n[_daught_]leach[_a_t_]leeds[_daught_]ac[_daught_]uk

Date: Thursday, November 17, 2005 at 16:59:13
Comments:

How strange. There I was running an experiment with my 488nm laser and getting VERY bored, so I thought I'd try and track down a few obscure '80s bands on the net. And there was your web-site! It was as if someone had taken all my favourite tracks and put them on your page. Wall of Voodoo, haven't heard Mexican Radio for ages!! Vicious Pink! What a great web-page.

---

Name:jbmugu URL: wwwjbmugu.com
Email: jbmug[_a_t_]maga[_daught_]com
Location: l m, lome t g
Date: Thursday, November 3, 2005 at 09:24:37
Comments:

i love ur site maintain ur champion guyman okkkkkkkkkkkk

---

Name: Bizi
Email: bizi21[_a_t_]freenet[_daught_]de
Location: Stuttgart, Germany
Date: Friday, October 21, 2005 at 10:07:16
Comments:

What a great site! I'm searching for some info stuff on lasers and your site is both informative and really fun (which is good on a Friday afternoon!!!)

---

Name: DR OSCAR MEDINA
Email: oscar_m69[_a_t_]yahoo[_daught_]com[_daught_]ar
Location: LEDESMA, ARGENTINA
Date: Tuesday, October 18, 2005 at 00:39:26
Comments:

HOLA , ANTE TODO QUERIA FELICITARTE POR TU PAGINA WEB, Y EN PARTICULAR POR UN PROYECTO QUE HICISTE , EL CONTROLADOR DE TEMPERATURA, EL CUAL ME GUSTARIA QUE ME DIGAS SI PUEDO USAR UNA PTC 100 EN LUGAR DE LA NTC, POR QUE QUIERO CONTROLAR TEMPERATURAS DE UN HORNO A CALOR SECO HASTA 200°C. ESPERO QUE NO HAYA QUE EFECTUAR MODIFICACIONES EN EL SOFTWARE QUE ENVIASTE CON EL CIRCUITO. ESPERO TU RESPUESTA. GRACIAS!! SALUDOS DESDE ARGENTINA!!!!!!

---

Name:
Email: r[_daught_]donahuejr[_a_t_]comcast[_daught_]net

Date: Monday, October 10, 2005 at 17:02:48
Comments:

I thoroughly enjoyed your web page on Mission Impossible... I only have one curiousity question, Did Mr. Phelps ever say "NO" to a Mission ?

---

Name: Kenny Hymel
Email: hymelk[_a_t_]candw[_daught_]ag
Location: St. Johns, Antigua & Barbuda
Date: Thursday, September 8, 2005 at 08:02:04
Comments:

Read through the the 'Rankine' station article today. Facinating and well presented, sir. My dad, LeRoy W5ENH, a member of the Antique Wireless Association and the Old Old Timers Club, would have jumped at the chance to tour that facility. Thank you for doing what you did, reporting what you saw so eloquently and professionaly. Well done and thank you.

---

Name:Oliver DJ Hochzeit URL: http://www.party-fest-feier.ch/dj/dj_navigation.htm
Email: olimark[_a_t_]gmx[_daught_]ch
Location: Zurich, Switzerland
Date: Thursday, September 8, 2005 at 07:09:35
Comments:

Awesome site guys... keep up the good work!

---

Name:Mugu Magga URL: www.mugu.com
Email: MUGUMAN[_a_t_]YAHOO[_daught_]COM
Location: Lome, LOME TOGO
Date: Thursday, July 14, 2005 at 05:15:45
Comments:

i love your site and i don lend there

---

Name: Max
Email: mrthebroken[_a_t_]hotmail[_daught_]com
Location: Bogota, Colombia
Date: Wednesday, July 6, 2005 at 02:38:44
Comments:

me: Max Email: mrthebroken[_a_t_]hotmail[_daught_]com Location: Bogotá, Colombia Date: Wednesday, July 6, 2005 at 02:36:12 Comments: First of all, congratulations, is an Excellent page! The knowedge is pretty good, but is GREAT the hability of teach it to the people. Please, I have a question: How can I get a power = 5 mW without using the well known but hard to find green laser diode? (A non related fact: I'm actually building a N2 TEA Laser, but obviusly it doesnt have the enough power) Thank you very much

---

Name: Chuck Willcox
Email: chuckw[_a_t_]mninter[_daught_]net
Location: Eden Prairie, MN USA
Date: Thursday, June 30, 2005 at 23:04:15
Comments:

Mark, I stumbled onto your web site after trying to find out what happened to the Olson Electronic store in Cleveland Ohio. Sadly, I think it is now defunct. Your childhood science interests seem to mimic my own - We both loved building science projects and tried to bridge the world between electronics and physics, I ended up getting my Ph.D. in theoretical physics, but I never stopped building gadgets. This makes me an odd sort of theorist. But I like it that way. I am now a self-employed consultant working on a wide array of technologies from MEMS devices to aerospace probes. I envy you with your university job. These are hard to come by. Anyway, I read through much of your web site and found resonance everywhere. I agree that electronics and hardware-based science projects have given way to software and video games. I have always noticed that the best applied engineers are those who had some type background in physics and played around with science projects and did experiments as kids. If fewer and fewer kids are tinkering - will the world end up running on poorly developed software? At least I'll always have a job! I ramble; anyway, I really did enjoy visiting your web site and want to thank you for the nostalgic trip back to my own past! - Chuck

---

Name: Surendra
Email: bishtss_at_hotmail_dot_com
Location: Scarborough, ONTARIO CANADA
Date: Wednesday, June 29, 2005 at 22:16:19
Comments:

Interesting site, I really impressed with your wide spectrum of knowledge and creative attitude (LASER, Micro controller, collector of antique computers……Tiling at home)Great

---

Name: Markus Hölzl
Email: ascii[_daught_]design[_a_t_]tiscali[_daught_]de
Location: Fischach, germany
Date: Friday, June 17, 2005 at 02:58:50
Comments:

hello porf. mark looking for some project, which should be done at the 'rudolf-diesel-technikerschule' in augsburg/germany we found your site and are still amazed, about what is possible to make with almost 'no-cost' in laserphysics. I bulit a 2mW HeNe- laser some years ago using a spectra-physics tube ane a homemade regultated powersupply from 12Vdc. it still works well, and I use this for party-decoration, while sending the laserbeam through a profiled slow turning tile of glass. the interferences are quite pretty. but the lasers shown on your homepage are the 'real stuff'. I will start to collect some required meaterials immediately, and try to build a TEA nitrogen type laser. I have some experience withe plasma ane welding arcs, and balls enough to build a high voltage supply, stolen from an color TV or VGA-monitor. so its you dear prof. mark, who infects an welding specialist and one technician with the 'laser-homebrew-virus'. lot of thanks for this :-) - sience is cool. best wishes from south of germany. markus Hölzl / DG5MdB

---

Name: Adam Kitzmilller
Email: retroflow[_a_t_]yahoo[_daught_]com
Location: Drexel Hill, PA USofA
Date: Thursday, June 9, 2005 at 02:31:52
Comments:

Dude, like there was so much radical music in the 80s that you like totally left out. But I did adopt Pink Floyd's "Time" as my annual birthday song. Best wishes.. I was here.

---

Name:Eric Juve URL: www.nautamatic.com
Email: ejuve[_a_t_]nautamatic[_daught_]com
Location: South Beach, OR USA
Date: Monday, May 16, 2005 at 19:19:04
Comments:

Really enjoyed your site. It brought back memories of my tour of the McNary dam on the columbia river, in 1968. At that time they were still syncing to the net manually. The Phase of the power placed on the grid was controlled by an IBM 1800 computer. Thanks for the interesting content.

---

Name: luca olla
Email: trubks[_a_t_]libero[_daught_]it
Location: guspini, ca italy
Date: Monday, April 25, 2005 at 15:54:34
Comments:

thanks for your enigma project i think that it's a great project and i have decided to present it at school for my state exam

---

Name: daniel
Email: daniel[_a_t_]mslabo[_daught_]com
France
Date: Sunday, April 24, 2005 at 15:38:34
Comments:

hello Mr marck very good i remember the good time and i bigen to cleane and ubdate my old c4p sn°12256 i need the map for board a-13 or the a-13

---

Name:Jackson Garcia URL: 318 39th St
Email: jackson_garcia704[_a_t_]hotmail[_daught_]com
Location: Brooklyn, NY U.S.A.
Date: Friday, April 22, 2005 at 19:30:53
Comments:

HI I GOUND YOUR WEB SITE WHEN I WAS LOOKING FOR A PROJECT FOR MY PROJECT SEMINAR CLASS in New York Institute of Technology in Manhattan. IT'S VERY INTERESTING FOR ME SINCE I'M IN MY 3RD YEAR FOR MY BACHELOR IN ELECTRONICS ENGINEERING TECHNOLOGY. I THINK YOUR WEB SITE MAKE ANYONE GET INTO ELECTRONICS FOR THE MANY PROJECTS YOU'VE DONE THAT ARE ACTUALLY VERY INTERESTING. I'D LIKE TO KNOW IF I CAN USE THE PIC-BASED DOLLHOUSE ELEVATOR AND LIGHTS PROJECT FOR MY CLASS. I'LL GIVE YOU CREDITS SINCE I'M YOU WERE THE ONE WHO BUILT. I'LL PROBABLY BE FILMED, IF YOU GET ME THE PERMISSION, I'LL SEND YOU THE FILM. WISHING YOU ALL THE BEST AND ALL MY RESPECT TO YOU HAVE A NICE DAY.

---

Name: Gordon Gardner
Email: gordgardner[_a_t_]hotmail[_daught_]com
Location: Jackson's Poinr, ON Canada
Date: Wednesday, April 20, 2005 at 17:14:06
Comments:

Hi there: I stumbled onto your site while researching older technology. You have an interesting site. I'm a retired electrician and electronic technologist so I was particularly intrigued with your tour of the electrical generating facilities around Niagara Falls. I'm also a WW2 history buff so I was delighted to find pages on the Enigma cipher machine. It seems to me you're doing exactly what you want to in life. Enjoy.

---

Name: haris wahyu
Email: hariswj[_a_t_]yahoo[_daught_]com
Indonesia
Date: Tuesday, April 19, 2005 at 19:45:56
Comments:

Hello, where is your INVERTP.DWG file?

---

Name:Mike Boldin URL: http://technology.niagarac.on.ca/
Email: mboldin[_a_t_]niagarac[_daught_]on[_daught_]ca
Location: Welland, ON Canada
Date: Thursday, April 14, 2005 at 11:22:34
Comments:

Testing fixed permissions...

---

Name: Tony Reetz
Email: atreetz[_a_t_]hotmail[_daught_]com
Location: Galesburg, MI USA
Date: Tuesday, March 29, 2005 at 19:17:46
Comments:

Mark, Love your site. I was just wondering if you had any dimensions what-so-ever for 'Fairbottom Bobs'. I'm doing a descriptive research paper for a Technical Writing class. Any would help. Thanks for everything.

---

Name: VANARSA ANIL KUMAR
Email: vanarsa[_a_t_]yahoo[_daught_]co[_daught_]uk
Location: kurnool, AP INDIA
Date: Monday, March 14, 2005 at 14:20:39
Comments:

HELLO WORLD I AM VERY GLAD TO INVITE YOU ALL MATES .

---

Name: OBINNA
Email: OBINNA[_a_t_]LAG[_daught_]COM
Location: BALOGUN, LAG NIGER
Date: Friday, March 4, 2005 at 06:37:38
Comments:

COOL SITE MGBADA AND HI TO GUEST.OBINNA MAGAOOOOOOOOOOOOOOO

---

Name: Dan Cunningham
Email: danielc703[_a_t_]aol[_daught_]com
Location: decatur, il usa
Date: Thursday, March 3, 2005 at 02:15:06
Comments:

Thank you lord for your site, Ive been hunting through forums and websites for a simple answer I found about dpss pointers from your detailed info. If you have time maybee you could read about a hurdle ive encountered...Ok I have a leadlight 105 and on my quest to achieve a super bright beam that would burn things finally worked out and after alignment,potmod,and resistor replacement I got 65mw at a stable 440ma. And unit never to produce any significant heat. I was happy as hell to get this out of a pointer but it only lasted for about a day. Just yesterday I took my pointer apart to fix my button because I couldnt use the black plastic shroud that hold the circuit board stable because I used the big resistors with the leads on each end. Anyway I noticed the circuit board was slanted down alittle from pushing on the button too hard so I pushed it back up very lightly and the circuitboard just gave as if the diode legs snapped. I pushed the circuitboard back down straight and checked everything out and it seems everything was ok. So I loosened the lock ring to check the diode out, I got the circuit board off and sat it on the table and then dropped the brass tube on the floor. I found 1 brass shroud that goes over diode and 1 lense with brass ring around it. Ok so I checked were the diode legs attach to the diode and everything seemed fine so I put everything back together and tried it out. And it was only a very dim dot. So after flipping the lense 5-6 different times I still cant get a good beam. I read on here somewhere the concave part goes towards the diode so I took it apart and cleans all lenses with alcohol and made sure concave part was facing diode. Now after assembling again I only get 15mw compared to 65mw it did have. I tried cleaning everything again,aligning the diode,adjusting the pot but cant get anything close to my 65mw. Is there a lense or something missing? The brass tube with IR filter on it has a lense built into it that I can see when looking in the tube, then ontop of it I put the lense with brass ring,then the diode with brass shroud over it. Is there something I lost? I thought maybee the diode legs were presure fitted inside the diode and it came loose so when its all together and I push the button down I wigled the board up and down but it doesnt help. Also I get alot of artifacts. And another strange thing is I took the 220 ohm resistor off and it still works the same. I checked current draw and its close to 400ma (originally 440ma) but I just aint getting nothing for power. Damn it I just want my original 65mw back and ill stop messing with it. Anyone know if im missing a lense or something? Or anything I can do to get my pointer working good again? PLEASE HELP!!!thanks

---

Name: German Perez
Email: gperezcad[_a_t_]ahoo[_daught_]com
Location: Duitama, Boyaca Colombia
Date: Friday, February 18, 2005 at 16:25:39
Comments:

I found your web by accident, I think youre work are very interesting

---

Name: Martin Williams
Email: Marwill1[_a_t_]aol[_daught_]com
Location: Stockport, England
Date: Tuesday, December 28, 2004 at 15:55:45
Comments:

Enjoyed your site. Came across it after looking up Park Brige and found a link to you on the 'Fairbottom Bobs'. My family used to live a few hundrecyards from the site of the 'bobs'. My father was interested in industrial archealogy and woulds take me out on discovery walks all over the north of England, pointing out sites of interest etc. The 'bobs' was one of them. This would be in around 1970. When we last visited the site was owned by a small holder, who did not take to Dad and I clambering through the undergrowth to see the site of the old 'bobs', we got chased off with a few choice words on our ears. The whole place is pretty well cleaned up now and is part of a heritage site. Looks a bit antiseptic now, I prefer the fond memories of that day with my dad, industrial decay, and grime! cheers Marwill

---

Name: Rommel M. Lagman
Email: rommelec2000[_a_t_]yahoo[_daught_]com
Location: Quezon City, MNL Philippines
Date: Tuesday, December 21, 2004 at 05:13:04
Comments:

Just Looking for a circuit of a True Sinewave Power Inverter nice Project on your Power Inverter. And also you have a nice site hope to see more stuff.

---

Name: Steve Simpkin
Email: stevesimpkin[_a_t_]hotmail[_daught_]com
Location: Lancaster, CA USA
Date: Tuesday, November 30, 2004 at 16:47:03
Comments:

Hi I really enjoyed your Ohio Scientific site! My first computer was Ohio Scientific Challenger 1P that I bought for US$350.00 in December 1979. I eventually added 4K of RAM ($50 - great price!) and wired in a GI sound chip. Those were that days! I still have an original copy of a circa 1979 Ohio Scientific computer product catalog if you are interested in scans of it. Thanks again for a trip down memory lane.

---

Name: Patrick Sirois
Email: patrick[_daught_]sirois[_a_t_]cfer[_daught_]tva[_daught_]ca
Location: Rimouski, Que Canada
Date: Monday, November 15, 2004 at 15:59:52
Comments:

Hi Mark! Very good web site. As a railfan I am very interested in railway signals. Your explanations about the CROR and signals interpretation are very good. However,one thing got me confused. The signal aspect Red over Yellow, rule 426 IS USED by some railroads to indicate that the switch is aligned for the siding. This is the case for the Quebec North Shore and Labrador Railway. The railroad is hauling Ore concentrate and pellets from Labrador City, 260 miles from Sept-Iles, Quebec. QNS&L is using CTC since the beginning of it's operations in 1954. At that time, ore was shipped from Schefferville, 357 miles from Sept-Iles. My father worked there as a trainman, engineer and Trainmaster for 36 years. Trains loaded or empties, must be careful using turnouts and speed is restricted (15 mph). You can count up to 265 cars on a single train, which weights approx. 32 000 tons and is more than 2 miles in lenght. Single aspects dwarfs are placed at the end of the sidings, showing stop (red), clear to stop (yellow) or slow clear (green) indication. Patrick Sirois Rimouski, Quebec

---

Name: DR.MAGA MGBADA
Email: Guy[_a_t_]lome-Togo[_daught_]com
Location: ajengule, PANNINI TOGO
Date: Wednesday, November 3, 2004 at 03:38:05
Comments:

Back when I was fresh out of Technical school, I went to work for Tri-Comp Computers in Denver Colorado. I used to work on all of the OSI computers from the super board 2 to the C3-OEM wuth the 72 Meg Winchester Hard drive. We would troubleshoot to component level. We even memorized the memory test that we would have to key in to find the bad memory chip.. This site brings back very good memories for me. Thanks

---

Name:John URL: http://www.efleasales.com
Email: lugar123[_a_t_]yahoo[_daught_]com
NC USA
Date: Saturday, October 30, 2004 at 01:41:14
Comments:

Nice site.

---

Name: Sajal kundu
Email: tokyo_sajal[_a_t_]yahoo[_daught_]co[_daught_]in
Location: burdwan, w.b india
Date: Wednesday, October 27, 2004 at 04:15:52
Comments:

I want some PIC based sinewave Digital Inverter and UPS technology (full details circuit diagram/PIC software/PCB layout) without any costing.I shall very gladful if anyone send this type of material in my e-mail id: tokyo_sajal@yahoo.co.in

---

Name: Roy Thomas
Email: microcode[_a_t_]eth[_daught_]net
Location: Cochin, kerala India
Date: Monday, October 4, 2004 at 01:52:09
Comments:

Hai, Very much impressed by your UPS project.Thanks for the same.I am also a member of EDAboard.com (Picstudent) Thanks Roy Thomas

---

Name: Jeff Andrews
Email: AndreJe6[_a_t_]aol[_daught_]com
Location: Naalehu, Hawaii USA
Date: Monday, September 27, 2004 at 00:21:53
Comments:

Very interesting work you do .I came upon this site ,today,and see the Nitrogen Laser's out put may be good for curing photo initiator doped epoxy resin,I manufacture Hyper-Composite fishing rod blanks,here in Hawaii.Phoseon.com has an interesting product called RADION ,UV source.So the QUEST continues,enjoy your work,Aloha Jeff

---

Name: Ray Sharpe
Email: ray[_a_t_]sharpefire,com
Location: Kitchener-Waterloo, On Canada
Date: Sunday, September 12, 2004 at 10:18:16
Comments:

As my 20 year high school anniversary approaches, I found myself rememebering the music. A quick search found you too werer in the area and went to FED Hall.. Ahhh those were the day. Thanks for the music flashback.

---

Name:(Mr.) Robin Elkins URL: www.elkindustries.com
Email: LASEROB[_a_t_]aol[_daught_]com
Location: melbourne, FL USA
Date: Sunday, August 22, 2004 at 19:37:01
Comments:

good to see your website. you may want to look at mine. i tried to email you but could not find your address. thank you, ***************** LASEROB !!

---

Name: Alex Procup
Email: ic_eng[_a_t_]yahuu[_d_p_]common
Location: Reno, NV you know
Date: Sunday, August 15, 2004 at 13:20:13
Comments:

Superbe wPages my laser education begins. Best regards...

---

Name: Charlie Stauffer
Email: JGRIMES007[_a_t_]msn[_daught_]com
Location: Clarkridge, Arkansas US
Date: Saturday, July 31, 2004 at 05:25:18
Comments:

Very nice article on the Rankine Hydro Project, thank you for creating it.

---

Name:Glenn Coit URL: www.opg.com
Email: gcoit[_a_t_]niagara[_daught_]com
Location: Fonthill, ON Canada
Date: Friday, July 23, 2004 at 17:15:26
Comments:

Your Rankin page is excellent! I had a couple tours of the Toronto Power Generating Station back in 1978 including a trip right down to the turbine level, unfortunately I did not take any photos.

---

Name: sany
Email: cpsany[_a_t_]yahoo[_daught_]co[_daught_]in
Location: ekm, mumbai india
Date: Friday, July 23, 2004 at 15:00:01
Comments:

u really a super man.i like that inverter one. hoh it was really terrif.u relly don very well i am a biggest fan of u the PWM is relally susperb.and u have given a note that we can do sin wave by smller pulses.i have to try that one i think we have to use 16f72.becoz it have ADC and some more features.i thnk we can producce PWM by this kind of PIC tryuly u r biggest fan sany

---

Name: Timo Leppanen
Email: timo[_daught_]leppanen[_a_t_]pp[_daught_]phnet[_daught_]fi
Location: Arrakoski, finland
Date: Monday, May 10, 2004 at 19:06:22
Comments:

I need comp630 password

---

Name:Bob Whitten URL: http://www.geocities.com/Yosemite/Geyser/6105
Email: hooksetters[_a_t_]netzero[_daught_]net
Location: Roswell, NM US
Date: Wednesday, March 17, 2004 at 21:49:08
Comments:

I enjoyed your site. I was scanning the internet for more information on elevators and clicked on your link. I have been wanting to build an elevator in my home in Albuquerque and wanted to come up with a new way of building it. Your ideas give me ideas!! Keep up the good work!!! I guess some of my ideas and technology are outdated. I was thinking of using JK flip-flops for part of the circuit. I will read up on pic programming and go on from there. I am an avid fisherman and hope to try your part of the country one day. I really enjoyed your site. Thanks, Bob P.S. Spring is almost here and you need to take those kids fishing!

---

Name:John Roland Penner URL: http://home.earthlink.net/~johnrpenner/
Email: johnJohnPenner-at-mac-dot-com
Location: Toronto Island, Ont Canada
Date: Tuesday, March 16, 2004 at 00:11:45
Comments:

great site! lived in st. catharines, went to eden, governor simcoe, niagara college, brock -- loved lasers, robots, alternative music, and worked through computers: trs80 model 1, pet, unix icon, ibm-pc, macintosh... now running an ibook and after more than a decade of searching for and collecting those old cfny tunes... back to you! hope you enjoy! :-) john penner.

---

Name: David Smith
Email: zener[_a_t_]motoralaska[_daught_]com
Location: Wasilla, AK USA
Date: Saturday, March 6, 2004 at 00:56:27
Comments:

Hi,Back when I was fresh out of Technical school, I went to work for Tri-Comp Computers in Denver Colorado. I used to work on all of the OSI computers from the super board 2 to the C3-OEM wuth the 72 Meg Winchester Hard drive. We would troubleshoot to component level. We even memorized the memory test that we would have to key in to find the bad memory chip.. This site brings back very good memories for me. Thanks!

---

Name: Ugur Ural
Email: spactica[_a_t_]yahoo[_daught_]com
Location: istanbul, turkey
Date: Saturday, February 28, 2004 at 08:50:49
Comments:

I was looking for information about laser matter interactions and came across this site. Great site really. Congratulations

---

Name: Muguone
Email: Muguone[_a_t_]mugmmaga[_daught_]com
Location: Lome, Kara Togo
Date: Friday, February 27, 2004 at 16:32:16
Comments:

i love this site keep it up guysssssss i dee hereeeeeeeeeeeeeeeeeeeeooooooooooooooooooooooooooooooooo

---

Name: Anil Kumar Vanarsa
Email: vanarsa[_a_t_]yahoo[_daught_]co[_daught_]uk
Location: kurnool, ap india
Date: Thursday, January 15, 2004 at 20:44:07
Comments:

Hi this is anil kumar from india ,My hobbies playing table tennis,shopping , waching movies etc...

---

Name:Cam Spillman URL: http://www.subgenius.com
Email: jcspillman[_a_t_]sbcglobal[_daught_]net
Location: St. Louis, MO USA
Date: Saturday, December 27, 2003 at 00:46:12
Comments:

I have been WRACKING MY BRAINS for several years trying to remember what that thing was I saw in Aspen, Colorado in July of 1970. I hitchhiked in to town looking for old friends and psychedelic adventure. I had seen MusicVision in the Edmund Scientific catalog (who hadn't) but never saw one. I finally got my chance... I secured a bowl of unflavored yogurt and a handful of berries and nuts, and noticed that in a back room a private party was going on, centered around three CM and three HM "Motiondizers", and a cluster of hooded incandescent bulbs hooked up to color organs. The music was Pink Floyd and Sugarloaf. I drifted into the party room, ate my yogurt and tried to stay inconspicuous. The dark room improved on the feeble light effects and the presentation was actually cool. Cool enough for me to rummage around the 'net and get stuck in this site like flypaper. Thanx for reminding me, it was "MusicVision" and it was swell. Next stop: rewiring a black/white TV deflection yoke to accept stereo audio inputs. "There is nothing wrong with your television set...."

---

Name: Alex
Location: Swindon , UK
Date: Friday, December 12, 2003 at 14:21:30
Comments:

a wonderful and informative site. well done.

---

Name:Mark Csele URL: http://technology.niagarac.on.ca
Email: mcsele[_a_t_]niagarac[_daught_]on[_daught_]ca
Location: Welland, ON Canada
Date: Wednesday, November 26, 2003 at 12:00:30
Comments:

Test of anti-Spam-robot script changes

---

Name: Martin Williams
Email: jkwill01[_a_t_]gwise[_daught_]louisville[_daught_]edu
Location: Louisville, KY USA
Date: Wednesday, September 17, 2003 at 11:14:17
Comments:

I need a laser for excavating a basement where my crawl space currently resides. Conventional excavators all say there's too much rock. I looked ( on line ) at a 7 kW Nd:YAG used ( ~ 3000 USD ) but didn't bite. Any suggestions? Perhaps an ablative device like your megawatt N2 which is no longer on line?

---

Name: John Fitzpatrick
Email: ambiex[_a_t_]eircom[_daught_]net
Location: Dublin, Ireland
Date: Friday, September 12, 2003 at 13:10:35
Comments:

Excellent Site. This is one of the most informative sites on Lasers I'v visited. I was wondering if you ever dabbled in MASERs which use Microwave Frequencies? Love to see an article on that.

---

Name:Mehboob Ali URL: Under Construction
Email: mamsinternational[_a_t_]yahoo[_daught_]com
Location: Lahore, Punjab Paksitan
Date: Wednesday, September 10, 2003 at 10:25:10
Comments:

Hello Sir, I am running an Education Counseling company in Lahore Pakistan.I have visited your website which is really a great effort specially the computer one.I will be intouch with you officially to recruit students for Niagara College and unofficially to exchange ideas regarding Music and coputing. Regards, Mehboob Ali

---

Name: Halim Darmako
Email: halim_darmako[_a_t_]yahoo[_daught_]com
Location: Malang, Jawa Timur Indonesia
Date: Monday, September 8, 2003 at 09:58:21
Comments:

Can you help me how to make a laser CO2 TEA. Thank's

---

Name:Tim Ventura URL: http://www.americanantigravity.com
Email: tventura6[_a_t_]comcast[_daught_]net
Location: Kirkland, WA USA
Date: Wednesday, August 13, 2003 at 02:22:48
Comments:

Dear Mark: Hope your vacation went well -- you are apparently my mentor in absentia for the Nitrogen-Laser project. The attached video is the progress that I've made on my Nitrogen Laser -- I don't understand laying an inductor between the rails, as this kills any spark that would go between them. Putting a 1-megohm resistor between the capacitor plates seems to allow it to still work, though, although it doesn't seem to have much effect in comparison to the non load-balanced setup. The video shows my output, and the photo shows the capacitor setup -- two 3-foot square caps powered by a 30kV DC computer-monitor HV-tap. Good stuff .. I run the American Antigravity site at http://www.americanantigravity.com -- I am hoping to link your plans on the site on a TEA Laser page, and show the results that I got by following them. Notice how my caps are "on end" with the rail-system between them. That seems to help with the size constraints (a 3-foot tall laser is better than a flat 6-foot long laser). The picture tube on my laser is 4.2 nanofarads, and the two 3-foot caps are 4.86 nanofarads -- I've measured them both together and got a combined capacitance of about 8.85 nanofarads (roughly). I'm having trouble getting the spark to travel evenly -- a buddy of mine has a commercial Nitrogen-Laser head (a former SDI project apparently), but I don't want to spend $200 bucks to buy his and then get stuck have to re-tune my caps and power-supply for it anyways (it has a large gap and very tall rail system). Best wishes! Tim Ventura

---

Name: Lorenzo
Email: scalcon4[_a_t_]yahoo[_daught_]it
Location: Biella, Italy
Date: Sunday, July 27, 2003 at 10:35:47
Comments:

A wonderfoul site about LASER home-building,I like build a laser, this is the most intresting site that i read Thanks .... bye

---

Name: Juergen Fillbach
Email: juergen[_daught_]fillbach[_a_t_]snafu[_daught_]de
Location: Bernau, Germany
Date: Wednesday, June 11, 2003 at 03:44:34
Comments:

Hey great information about vintage computers. I am a small collector too. My stock is a PET 2001 / TRS80 Level II with expansion board / Apple II (the older one) and at least an AIM 65 bare board / AIM 65 fully assembled with 24 kB incl all the manuals. I am looking for an working KIM I or SYM I with manuals. I am willing to trade the AIM 65 bare board against a KIM I or SYM I. sincerely Juergen

---

Name: Peter Ness
Email: peterness[_a_t_]hotmail[_daught_]com
Australia
Date: Thursday, May 15, 2003 at 09:40:04
Comments:

Great music site. To answer a couple of your questions: Falco's "Der Kommisar" is on a 2 CD set "The ultimate retro collection part 2", 1998, Warner Music Australia Pty Ltd, Warner Special Projects.>

---

Transfer interrupted!

me One I believe was pulled after copyright problems, which is annoying because it has The Waitresses "I know what boys like" on it. I'm still searching for a copy myself. Looking forward to your book on light and quantum physics.

---

Name: Greg Larson
Email: LarsonGregC[_a_t_]netscape[_daught_]net
Location: Pismo Beach, CA U.S.A.
Date: Thursday, May 8, 2003 at 16:23:10
Comments:

I just wanted to say thanks. I am sort of new to the subject of lasers and I am going to use some of the the photos to do some explinations on some of the histor of lasers and how lasers operate. They are for a class project. Your site has been a big help. Greg

---

Name:Kevin Rudko
Email:krudko[_a_t_]ecn[_daught_]ab[_daught_]ca
Location: Edmonton, Alta Canada
Date: Friday, March 28, 2003 at 15:37:55
Comments:

Hello, its nice to see some sites on signalling in Canada. I too worked for the CPR in the S&C. Please check my website above, you'll understand my interest in your site. I have implemented both ABS and CTC signalling systems with PIC systems and am currently designing a complex signalling system myself. Your information is quite good, however, I notice that you refer solely to the CROR and not the signalling rules that are used in a given area. Almost all signalling systems these days are CTC, especially so in your area of the country. Whether a system is CTC or ABS make a big difference in terms of how signals portray their information. For instance, 'A-board' signals are NOT used in CTC, only ABS. Once again, glad to see someone else with the bug!! Kevin Rudko P.S. I'm finishing my BSc. Elec.Eng. at the U of Alberta currently, hope to be finished at Christmas.

---

Name: Ron Scott, Jr.
Email:caribcreole[_a_t_]hotmail[_daught_]com
Location: Philadelphia, PA USA
Date: Thursday, March 13, 2003 at 15:02:15
Comments:

Greetings Mark, So, you were the guy getting the 5 minute standing ovation at the 35th International Science and Engineering Fair! Glad to meet you. I won a lowly third place award from the Marine Corps for my ocean wave energy hydro plant. All I remember is the boriquas gritando (screaming puerto ricans LOL). The projects and genius in that ISEF event are very impressive, so I tip my hat to you for being top of that formidable heap. I remember dancing to "She Blinded Me With Science" on the first night of the event. I knew I was a nerd for life at that moment. I got picked up by an underage Utah babe, then again I was only 17! LOL I am an environmental consultant/urban planner. Still creating, still close to science. Gotta run, be well science buddy! Oh, I have partied at Carleton U, I am an ACACIA brother and the chapter there is great. Canada is a big ole gem. Be well - Ron

---

Name: Mark S. Csele
Email:mscsele[_a_t_]yahoo[_daught_]com

Date: Tuesday, March 4, 2003 at 05:03:25
Comments:

Where do you people come from? I had no idea that in the deep dark corners of the net i would find so many techheads i found this site look for my ancestors on the net so i seem to be a little lost i had no idea therwe were other Sceles out there

---

Name: Wally Wright
Location: Sydney, NSW Australia
Date: Tuesday, March 4, 2003 at 04:54:56
Comments:

Everything on this site is extremely techie but your efforts weren't all in vein, not all of it went over my head

---

Name: Kate
Email:kateaylmer[_a_t_]hotmail[_daught_]com
England
Date: Tuesday, February 4, 2003 at 17:32:10
Comments:

I wanted to point out that Soft Cell are most certainly not a one hit wonder band (I saw them live last night Feb 2003) and it's actually Yazoo not Yaz. However, you are seriously smart, like peppers & hot food and English beer -you rock!

---

Name:Larry Bishop
Email:ve3lab[_a_t_]msn[_daught_]com
Location: Ottawa, Ontario Canada
Date: Thursday, January 30, 2003 at 02:35:52
Comments:

Greetings from Larry Bishop.

---

Name: Rolando Balili
Email:rbalili[_a_t_]eudoramail[_daught_]com
Location: Tagbilaran City, BH Philippines
Date: Thursday, January 30, 2003 at 00:08:05
Comments:

got interested lately on inverters that can be use with inductive loads like motors, i'm thinkin of building the 2kVA of yours, but i would like to download the DXF and DWG files w/ out errors, i once down loaded the FETDRV.DWG and got and error when i opened it. You can send it as attachments to my email add. And before i close can this 2KVA be simulated in Circuit Maker 2000. I do have one problem on how to program the PIC. Great Site and more POWER roland

---

Name:yildirim cicek
Email:ciceky[_a_t_]aol[_daught_]com
Location: Aachen, 52477 Germany
Date: Monday, January 27, 2003 at 10:02:11
Comments:

its showtime.

---

Name: Imo Nkweini
Email:richmon74[_a_t_]yahoo[_daught_]com
Location: Uyo, Akwa Ibom State Nigeria
Date: Tuesday, January 21, 2003 at 14:57:35
Comments:

You are a great man for being able to share your knowledge with the public congrats

---

Name: Ian Springer
Email:Dutch_619[_a_t_]hotmail[_daught_]com
Location: Huntsville , Al. EE.UU.
Date: Friday, December 20, 2002 at 02:03:49
Comments:

Really cool site. I especially like the laser site! I got bored over a rainy weekend and built a dye laser! I also have a proccess for distilling flourescin from antifreeze, which was actually the hardest part. I have a trs-80 at home as well as a wang, so do not let your wife talk you into selling them. One last note, I hear a rumor that Industrial liquidators in Rancho Bernardo Ca. has an old HP minicomp for sale,

---

Name:Roy Blake
Email:rblake[_a_t_]niagarac[_daught_]on[_daught_]ca
Location: WELLAND, ON Guess
Date: Monday, November 25, 2002 at 11:48:47
Comments:

Hey Mark, Did you Get That Email I sent You with The Picture of Your Cat in that "comprimising" position? YoU really must get that thing fixed. See u, in "the lounge" ;)

---

Name: Daudi Mkwela
Email:bababingo[_a_t_]daudimkwela[_daught_]com
Location: Mbeya, Mby Tanzania
Date: Saturday, November 23, 2002 at 03:50:03
Comments:

Hi there!! Am real interested with your work and all that,am Introducing my self as I will be your next student next year taking Computer Engineering Technician,Hope you will help me to achive my Goals,Please You can call me too be cause I need some more help from you Sir,Here is my Mobile NUmber +255742608954. Thank You..

---

Name: Khan
Email:mardan_pk[_a_t_]yahoo[_daught_]com

Date: Monday, October 28, 2002 at 02:36:05
Comments:

Hello Sir, Thanks for sharing your knowledge with others. I really appreciate it personally. The 12K power inverter.I make it and its work perfect. its great. I use the IGBT,s instead IRl2203N. IGBT,s increased the efficiency of the unit when I use it For inductive load. But I am running it on square wave oscillation Source because I am not a programmer and I don’t know How to program the PIC,s. I am having request that if u pleas send me one programmed PIC for 220 volts 50 HZ. For sure I will pay the charges for that. Your help appreciated. Regards.

---

Name: Jay Yatulis
Email:bigj[_a_t_]niagarac[_daught_]on[_daught_]ca
Yatulis Island
Date: Tuesday, October 22, 2002 at 19:51:07
Comments:

What the hell is a laser?

---

Name: Frederick VanStout 'n' Bout
Email:Freddyb[_a_t_]thatsamyname

Date: Tuesday, October 22, 2002 at 19:40:43
Comments:

Das is good.

---

Name:ali
Email:htait_ali[_a_t_]hotmail[_daught_]com
Location: mulhouse, 100 france
Date: Tuesday, October 1, 2002 at 04:25:00
Comments:

DEA de chimie le sujet que je travaille est sur le refprmage autotherme de methanol pour la pile a combustible

---

Name: Jeff
Email:jeffwicklein[_a_t_]yahoo[_daught_]com
Location: Weston, FL USA
Date: Thursday, September 26, 2002 at 12:44:59
Comments:

Very nice site. Got here by searching for some PIC stuff, but wound up looking at all your links.

---

Name:Ameet Sarma
Email:coolamits[_a_t_]hotmail[_daught_]com
Location: kathmandu, bagmati Nepal
Date: Thursday, September 19, 2002 at 06:01:25
Comments:

sir, you have done the great work.i appreciate you. and wish for your help.

---

Name: Darius Slaski
Email:slaski1[_a_t_]hotmail[_daught_]com
Location: Portland, OR USA
Date: Monday, September 2, 2002 at 07:25:21
Comments:

Great site! Should add CO2 laser info as well,...especially the esoteric stuff,... not enough esoterics!! : )

---

Name:carl Lavertu
Email:carl_lavertu
Location: beloeil, quebec Canada
Date: Thursday, July 18, 2002 at 15:07:31
Comments:

very interesting site especially N2 laser

---

Name: O.Derin
Email:odrien[_a_t_]yahoo[_daught_]com
Location: istanbul, Turkey
Date: Thursday, July 4, 2002 at 19:05:43
Comments:

Thanks for sharing your knowledge with this PIC newcomer!

---

Name: Hendy
Email:h_licorish[_a_t_]hotmail[_daught_]com
Barbados
Date: Saturday, June 22, 2002 at 16:07:09
Comments:

EXCELLENT! Thanks for sharing your knowledge. I would like to build the 2k inverter. Do you or would you sell the programmed PIC. Best regards Hendy

---

Name:RoBSki!

Date: Wednesday, June 12, 2002 at 04:27:54
Comments:

Have fun :)

---

Name: Swapnil Mathur
Email:me_da_bizkit_man[_a_t_]yahoo[_daught_]com
Location: New Delhi, Delhi India
Date: Sunday, June 9, 2002 at 08:38:45
Comments:

Dude......anyone got proper schematics of A TEA Nitrogen Laser? I gotta build one for my school project. Help in this field would be appreciated

---

Name:Rob Brandreth-Gibbs
Email:mail2[_a_t_]bravo-zulu[_daught_]com
Location: Vancouver, BC Canada
Date: Monday, May 13, 2002 at 04:06:03
Comments:

Just Fascinating. I'll get to the rest of the site after a few comments: I stumbled across your site after previous fruitless searches and numerous laments about the lack of web material on the Superboard II- one of which I have. (It's surprising how many collectors don't have one and don't have it on their wish list. Maybe they're just not familiar with it?) Your Superboard article has inspired me to dig about in my storage locker for it and bring it back to life. (Now where can I get a copy of the operations booklet? And how would it be hooked up to a modern monitor, anyway?) I first purchased a Z-80 (or 81) but was so disappointed in the interference generated by it (this would vary depending upon how much pressure you applied to its top) that I returned it for a Superboard. What an improvement! And was I just flying when I upgraded to a mighty 8K. I used to get the Aardvark newsletter- I think it was from Aardvark- (they'd always have a small BASIC program to type in) and from that bought a soundboard kit that I never did install. I did have a lot of fun programming BASIC computer games. Peeks & pokes! (Hey, wait-a-minit... wasn't that the name of the newsletter?) Never figured out Hex- it looked like hieroglyphics. Relatives would ask me what you could do with computers... I would answer "anything!" although I really had no concept as to what that actually meant. Sure do wish I invested in a small company that came to my notice around that time or shortly after- Microsoft. I once built a crystal radio from a "tickler" galena crystal; coils; waxed paper/aluminum foil capacitors, etc. In another life I think I would have liked to have been some kind of electrical engineer. Instead, I am a video and film producer which was next in line after my other childhood fantasy job- astronaut. :-) Thanks for the trip down 8k memory lane. Cheers, Rob

---

Name: Francis Tan
Email:ncactan[_a_t_]pd[_daught_]jaring[_daught_]my
Location: Kuala Lumpur, WP Malaysia
Date: Tuesday, March 26, 2002 at 23:23:08
Comments:

It is nice to discover a person with such a vast interest in science and technology. Not only you have the knowledge and interest in the field of electronics, physic, mechanical and woodwork, but also have the hands-on on making them work. Good achievement!

---

Name: ZIAD KANDAKJI
Email:ziad_ka[_a_t_]hotmail[_daught_]com
Location: toronto, ont canada
Date: Tuesday, March 26, 2002 at 12:07:54
Comments:

MR. CSELE THANK YOU FOR YOUR INTEREST AND INPUT IN THIS WOUNDERFULL AND INFORMATIVE SITE. ALTHOUGH I WISH YOU COULD EXPLAIN SOME THINGS IN MORE LAYMEN TERMS, FOR EXAMPLE WHERE YOU ARE TALKING ABOUT USING A CERTAIN CAPACITOR FOR A XENON FLASHLAMP THAT WILL WORK ON A DYE LASER THANKS TO ITS LOW INDUCTANCE OR SOMETHING LIKE THAT, YOU EXPLAINED IT VERY WELL BUT FOR SOME ONE LIKE ME WHO HAS AN INTEREST IN LASERS BUT NOT TO ELECTRICALY INCLINED, I HAVE TO STRUGLE TO MAKE SENSE OF IT ALL. I HAVE HAD AN INTEREST IN LASERS EVER SINCE I WAS IN GRADE SCHOOL AND HAVE ALWAYS WANTED TO BUILD ONE. I AM NOW MUCH MORE SERIOUS ABOUT ACTUALLY DOING IT AND PLANING TO EXPERIMENT WITH DYES BECAUSE I FIND IT TO BE A MORE OBTAINABLE COST EFICIENT LASING MEDIUM. I HAVE A RED DYE CALLED PONCEAU S AND A BLUE DYE CALLED PHAST GEL BLUE R WHICH IS FILTERED AND PROPORTIONALLY MIXED IN METHANOL GIVEN TO ME BY MY UNCLE WHO WORKS IN A LAB. I AM NOT SURE IF THEY WILL LASE SINCE I HAVE NO IDEA ABOUT MOLECULAR STRUCTURE OR WETHER THEY ARE ORGANIC OR NOT IF THAT MAKES A DIFFERENCE. ALSO THE PUMP LIGHT SHOULD THAT BE XENON OR CAN A CONTINUOUS 500W HALOGEN LIGHT WORK? I HAVE MANY QUESTIONS THAT NEED TO BE ASKED OF YOU BUT DONT KNOW IF THERE IS ANOTHER PROPER WAY TO CONTACT YOU. PLEASE FEEL FREE TO E MAIL ME IF YOU HAVE THE TIME. THANK YOU SO MUCH AND KEEP UP THE GOOD WORK SCINCERELY YOURS ZIAD KANDAKJI

---

Name: ZIAD KANDAKJI
Email:ziad_ka[_a_t_]hotmail[_daught_]com
Location: toronto, ont canada
Date: Tuesday, March 26, 2002 at 12:05:33
Comments:

MR. CSELE THANK YOU FOR YOUR INTEREST AND INPUT IN THIS WOUNDERFULL AND INFORMATIVE SITE. ALTHOUGH I WISH YOU COULD EXPLAIN SOME THINGS IN MORE LAYMEN TERMS, FOR EXAMPLE WHERE YOU ARE TALKING ABOUT USING A CERTAIN CAPACITOR FOR A XENON FLASHLAMP THAT WILL WORK ON A DYE LASER THANKS TO ITS LOW INDUCTANCE OR SOMETHING LIKE THAT, YOU EXPLAINED IT VERY WELL BUT FOR SOME ONE LIKE ME WHO HAS AN INTEREST IN LASERS BUT NOT TO ELECTRICALY INCLINED, I HAVE TO STRUGLE TO MAKE SENSE OF IT ALL. I HAVE HAD AN INTEREST IN LASERS EVER SINCE I WAS IN GRADE SCHOOL AND HAVE ALWAYS WANTED TO BUILD ONE. I AM NOW MUCH MORE SERIOUS ABOUT ACTUALLY DOING IT AND PLANING TO EXPERIMENT WITH DYES BECAUSE I FIND IT TO BE A MORE OBTAINABLE COST EFICIENT LASING MEDIUM. I HAVE A RED DYE CALLED PONCEAU S AND A BLUE DYE CALLED PHAST GEL BLUE R WHICH IS FILTERED AND PROPORTIONALLY MIXED IN METHANOL GIVEN TO ME BY MY UNCLE WHO WORKS IN A LAB. I AM NOT SURE IF THEY WILL LASE SINCE I HAVE NO IDEA ABOUT MOLECULAR STRUCTURE OR WETHER THEY ARE ORGANIC OR NOT IF THAT MAKES A DIFFERENCE. ALSO THE PUMP LIGHT SHOULD THAT BE XENON OR CAN A CONTINUOUS 500W HALOGEN LIGHT WORK? I HAVE MANY QUESTIONS THAT NEED TO BE ASKED OF YOU BUT DONT KNOW IF THERE IS ANOTHER PROPER WAY TO CONTACT YOU. PLEASE FEEL FREE TO E MAIL ME IF YOU HAVE THE TIME. THANK YOU SO MUCH AND KEEP UP THE GOOD WORK SCINCERELY YOURS ZIAD KANDAKJI

---

Name:Howard Potter
Email:howard_potter[_a_t_]msn[_daught_]com
Location: Woking, Surrey United Kingdom
Date: Sunday, March 17, 2002 at 13:40:30
Comments:

Love your site. I also have interest in lasers, and in particular green laser pointers. I would like to spend time making my own holograms, but with a young family, I don't thing it will be this week!!. Keep up the good work, I will be back in touch

---

Name: Subhash Yadav
Email:subhash[_a_t_]consultant[_daught_]com
Location: surat, gujarat india
Date: Wednesday, February 27, 2002 at 14:54:57
Comments:

Really good!

---

Name:Harish Pillay
Email:h[_daught_]pillay[_a_t_]ieee[_daught_]org
Location: Singapore, SG Singapore
Date: Tuesday, February 26, 2002 at 12:17:45
Comments:

I was pleasantly surprised to see a pix of the OSI Superboard II on your site. I am a proud owner of one of them from way back in 1980 or so. I still have it though it is in my room at my parents home. I should take it out, dust it off, and show it off to you two young sons. Harish Pillay 9V1HP Singapore h.pillay@ieee.org

---

Name: Vajira Perera
Email:vajira[_a_t_]wow[_daught_]lk
Location: Colombo, Sri Lanka
Date: Sunday, January 13, 2002 at 13:07:03
Comments:

Thanks for your support. You are helping the world by your knowledge, not many people would like to do this kind of thing. Thanks.

---

Name:Robert Wilterdink
Email:
Location: Winterswijk, Netherlands
Date: Saturday, January 12, 2002 at 12:04:59
Comments:

Thx to your site i can make my project work! Really great site! Thx man! Robert

---

Name: Cezar Sierra
Email:cezarsierra[_a_t_]hotmail[_daught_]com
Location: Makati City, Metro Manila Philippine
Date: Friday, December 7, 2001 at 22:30:46
Comments:

Thanks for sharing your knowledge! Best Regards.

---

Name: Wes Tilton
Email:wtilton[_a_t_]ecis[_daught_]com
Location: Brentwood, CA USA
Date: Monday, November 12, 2001 at 21:44:09
Comments:

Fantastic site. Thanks for such neat entertainment!Your site has given me a lot of ideas on how to proceed with my project. Thanks again

---

Name:vanarsa anil kumar
Email:vanarsa[_a_t_]yahoo[_daught_]co[_daught_]uk
Location: kurnool, ap india
Date: Tuesday, November 6, 2001 at 14:06:49
Comments:

i need your aplication to join in your university for post graduation for information technology course and your university details to my address

---

Name: Vaithi
Email:rvs[_a_t_]lntecc[_daught_]com
Location: Mumbai, India
Date: Sunday, November 4, 2001 at 04:13:51
Comments:

Ideas of laser emmitting devices are quite useful

---

Name:Manga
USA
Date: Wednesday, October 31, 2001 at 18:41:00
Comments:

Excellent site. THanks
cats

---

Name:De-graft Asare-Bediako
Email:Cutestyles[_a_t_]hotmail[_daught_]com
Location: welland, ON Canada
Date: Monday, October 15, 2001 at 17:01:48
Comments:

Thats a good site but there is more room for improvement.

---

Name:James Baxter
Email:jbax[_a_t_]canada[_daught_]com
Location: Vancouver, BC Canada
Date: Tuesday, October 9, 2001 at 15:24:51
Comments:

Your site rocks! very inspiring. wish i could meet people like you for chit chat. Im an imformation junky and you are a source of very cool knowlege. Take care. Jim

---

Name: James-Patrick Devitt
Email:James_Devitt[_a_t_]Hotmail[_daught_]com
Location: Mississuaga, ONT Canada
Date: Thursday, October 4, 2001 at 08:55:52
Comments:

Hello Mark, I'm very much interested in the courses at Niagara in respect to Photonics. Several years ago, (would you believe eight), I pick up a simple project book about optics and found it very stimulating. Unfortunatley as a programmer analyst and a lacking guidence this hobby was shelved. Switches and particularly senors are my keen interest. After touring the PRO website I located, Niagara College and found this web page. Can you point me to a location that details the courses Niagara offers? Also, I'd like to attend the Discovery Day, on the 10th and would like to know what campus would be apropriate - Photonics. thank you -James

---

Name: s,ananhanarayanan
Email:n_anantha[_a_t_]hotmail[_daught_]com
Location: Mumbai, India
Date: Saturday, September 1, 2001 at 08:21:14
Comments:

thanks for putting up useful stuff. wish we all had such a resource years ago!

---

Name: Mark Csele
Location: Welland, ON Canada
Date: Thursday, August 30, 2001 at 08:47:38
Comments:

Back Online with a new SUN server ... testing CGI stuff.

---

Name: Raymond J. Woods
Email:rjwood1955[_a_t_]yahoo[_daught_]com
Location: Sevierville, TN USA
Date: Sunday, May 27, 2001 at 00:06:04
Comments:

Great to see the Superboard II. I am looking for one. Would you know where I could find one?Thanks!

---

Name: Manolo delos Reyes
Email:manolodelosreyes[_a_t_]netscape[_daught_]net
Location: Quezon, Philppines
Date: Sunday, May 13, 2001 at 21:30:00
Comments:

Hi Mark; Thank you very much for your featured article about the 2kw inverter. I am just curious if its output is a digitized sinewave or a just a plain pwm square wave.

---

Name: Ray
Email:uraypatel[_a_t_]yahoo[_daught_]com
Location: Fort Worth, TX USA
Date: Tuesday, April 24, 2001 at 14:26:04
Comments:

Nice job for making your work Public. I am currently developing new COILaser methods and wireless sensors.

---

Name:Alfred Lee
Email:alfred1520[_a_t_]yahoo[_daught_]com
U.S.A.
Date: Sunday, April 22, 2001 at 03:48:17
Comments:

I found your page (http://www.technology.niagarac.on.ca/people/mcsele/OhioScientific.html) through a search engine. I got a warm and fuzzy feeling as I went through the content. This is my first computer! The year was 1980. I learned my computer programming, BASIC, UVEPROM programming, machine code programming (in machine code!, i.e. in hex), hardware interfacing, etc. on this machined. One modification not mentioned in the page is the 48 column display modification. Thanks for giving its place in history.

---

Name:Mike Boldin
Email:mboldin[_a_t_]niagarac[_daught_]on[_daught_]ca
Location: Welland, ON Canada
Date: Monday, April 9, 2001 at 10:31:34
Comments:

Testing the fixed Guestbook... :-)

---

Name:Gordon Foat
Email:ecoreview[_a_t_]yahoo[_daught_]co[_daught_]uk
Location: LONDON, UK
Date: Monday, January 22, 2001 at 12:22:01
Comments:

You might find FutureEnergies a great read. http://www.futureenergies.com Great to see new stuff!! If you have any ideas for Future methods of power production,renewable energy etc please email me. We need all the help we can get to reduce carbon dioxide!!

---

Name: Mohamed
Email:mohamedmao[_a_t_]htomail[_daught_]com
Location: Welland,
Date: Thursday, January 11, 2001 at 18:58:44
Comments:

I have seen the work you have done. Although I don't know alot about it but still I think its a kind of extraordinary job. You know what? I'll be attending your class on tuesdays for tech238. I think I'm gonna learn lots of things from you while doing my 3 year computer engineering technology. Keep up the experiments.

---

Name:Charles Lundberg
Email:calundberg[_a_t_]hotmail[_daught_]com
Location: Olympia, WA USA
Date: Tuesday, November 14, 2000 at 11:51:46
Comments:

I am intersted in talking to anyone who collects old 8-bit computers. I have a large supply of them, including several Apple clones, OSI, Commodore (Vic-20, C64, B128), Z-80 (CPM, TRS-80, Heath, etc.), TI, and several other brands. I also have a wall of documentaion, books, software, etc. I was a hobby software developer for 8-bit computers and now prefer to spend my hobby time composing music. I want to donate this lot of computers and documentation to someone who is interested in preserving the history and hardware of 8-bit computer technology. It seems that there should be a museum of computer technology somewhere in the USA/World. Contact me if you have any ideas/help on this subject.

---

Name: G Ried
Email:gregor[_a_t_]uoguelph[_daught_]ca
Location: Guelph, ON Canada
Date: Thursday, October 26, 2000 at 17:18:07
Comments:

Great listing of eighties alternative. I used your list to track down many songs. I was quite young in the early eighties and had heard the songs but didn't always know the names. Cheers

---

Name: Andy Pagin
Email:Andy[_daught_]Pagin[_a_t_]hampden[_daught_]co[_daught_]uk
Location: great Missenden, Bucks UK
Date: Thursday, August 3, 2000 at 10:30:18
Comments:

I have been taking a cyber-trip down memory lane tracing anything on the computers I used at school. Great to see your page on the Superboard. Our computer club at school had two Superboards, a ZX80 and a RM 380Z.

---

Name:PISSAVIN Hubert
Email:Pissavin[_a_t_]aol[_daught_]com
Location: St LAURENT du VAR, - France
Date: Monday, July 24, 2000 at 10:38:14
Comments:

Hello, I read with a lot of interest your paper: http://technology.niagarac.on.ca/people/mcsele/lasers/LasersTEA.htm I built a classical Nitrogen laser but getting Nitrogen, pump... all that is boring. I wonder if I can reach the same result with an air laser. On advantage of a air laser, compared with a normal Nitrogen laser is that we can build it only with aluminum plates, plastic films... all that is cheap and very easy to modify. In a Nitrogen laser, everything is glued, sealed and hard to modify which means hard to improve with the test and retry method... I'm very intersted in the /TEA-Ptel.jpg design, I have some questions about it: - have you any more info not on your Web page on it ? - when I look to TEA-PAtel.jpg, whole dimensions look like about 28x15cm, drawing indicates about 28x(14+8+...)= 28x25 cm, am I correct ? - why it uses a bent electrod on one side and a semi-cicular on the other side? Bent seems PK but with a semi-circular electrods, it seems that plasma position is not weel know and output laser beam may be poor ? - Is there a theory to optimize (even an order of magnitude) the air laser electrodes geometry ? (for example, having the same width at each output, or the same value for the 2 capacitors is probably not the best for optimization) - About TEA-air.jpg fig 1c, what is the glass tube used for ? - To save place (and perhaps speed ?), I wonder if anyone has tried to built such a laser with 2 // capacitors: I mean: a sort of common ground plate. Each side of this plate covered with plastic film and another plate (on each side) for each capacitor. > < | | | | | | | | | | | | | GND Then one side of this double capacitor is equipped with proper adjustable electrodes. Is there a problem with the ultra-fast discharge required? has anyone try it before ? Another problem with this laser (for amateur) is to measure average (or peak) power (to be able to increase it). Have you tried to install a little clear box filled with dye solution and installed between the laser output and a phototransistor connected to an oscilloscope ? A simple trick I found, realise a litle 1 tunr 10 mm diameter self, connect it to your oscilloscope and dispose it at about 50mm in the axis of the Blumlein self. We can safely see very interessant things on the scope. Of course, signal isn't stricly identical to the original one but it does worthwile to do the trick. Thank you for your answer Hubert SCIENCES POUR TOUS http://members.aol.com/hpspt/lasers.htm near NICE and Monaco, in the South-East of France

---

Name: Shain
Email:ir_rufus[_a_t_]canoemail[_daught_]com
Location: mississauga, on Canada
Date: Wednesday, June 21, 2000 at 17:03:47
Comments:

Hope you read your guest book ;) I'd be interested in one of your extra "Superboards" as I too cut my teeth of one of these guys... borrowed one in exchange for performing the RAM upgrade... Been to both Exceltronics and Arkon ;)

---

Name: John Skerritt

Date: Sunday, June 11, 2000 at 09:33:12
Comments:

I am interested in your temperature alarm system and help is needed to purchase products.

---

Name: John Skerritt
Email:skerritt50[_a_t_]hotmail[_daught_]com
Location: Charlotte Amalie, St. Thomas
Date: Sunday, June 11, 2000 at 09:28:04
Comments:

I am interested in your temperature alarm system and would like to get further information on the product.

---

Name: Bernard
Email:bakru[_a_t_]xoom[_daught_]com
Location: Muenster, Germany
Date: Friday, June 2, 2000 at 09:05:04
Comments:

Hello, I stumbled over your Nixie-Page during a search for photoresistors... and was amazed by your Nixie-Counter. I would like to use it on my (not yet existing) web page and kindly ask you for a copy of the script & gif -- of course, I will add an acknowledgement telling the visitors where the counter originates from... With kind regards, Bernard

---

Name:Douglas George
Email:dcgeorgesc[_a_t_]aol[_daught_]com
Location: Simpsonville, SC USA
Date: Thursday, April 6, 2000 at 22:00:28
Comments:

I originally was drawn to your site via your inverter design. I was searching for info on constructing a "beefy" inverter, and became awe struck reading about your project! I fully intended to grab a schematic and run. After spending an hour (or two?) perusing your site I'm compelled to acknowledge your vast talents AND superb efforts to share your knowledge and accomplishments. Thank You! Doug George A Connecticut Yankee livin' in Dixie ...:-)

---

Name:Patrik Jonas
Email:jona[_a_t_]atlas[_daught_]cz
Location: Prague, CZ Czech rep. /Europe
Date: Saturday, March 4, 2000 at 16:39:05
Comments:

Really nice, interesting site. You have similar interests to me - I am playing guitar, tenor sax, singing (in two bands). A few years ago I have writed some software (clear machine code) for Z80´s. At this time I am starting playing with PICs and AVR. Your PIC projects are really cool. I found here a lot of usefull informations for me. THANK YOU!

---

Name:Patrik Jonas
Email:jona[_a_t_]atals[_daught_]cz
Location: Prague, CZ Czech rep. /Europe
Date: Saturday, March 4, 2000 at 16:38:42
Comments:

Really nice, interesting site. You have similar interests to me - I am playing guitar, tenor sax, singing (in two bands). A few years ago I have writed some software (clear machine code) for Z80´s. At this time I am starting playing with PICs and AVR. Your PIC projects are really cool. I found here a lot of usefull informations for me. THANK YOU!

---

Name: Oscar Piscitelli
Email:o_pisci[_a_t_]yahoo[_daught_]com
Location: Argentina, Mendoza Argentina
Date: Thursday, February 3, 2000 at 00:04:27
Comments:

I'm interested on build a laser based system to detect intruder at home.Exactly, I'm thinking in to protect the patio zone of my home.I don't have experience in laser but I have seen that the inexpensives lasers pointers has a great reach but I couldn't obtain some apropiate article about which is the best circuit to detect the beam and how can I modulate the beam to avoid interference with another source of radiation. Could you give me some idea?.I'll be grateful for anything you can teach me. Thanks.

---

Name: Mike Harrison

Date: Wednesday, January 26, 2000 at 14:36:26
Comments:

OOps - book mangled the URL : www.netcomuk.co.uk/~wwl/electric.html

---

Name:Mike Harrison
Email:wwl[_a_t_]netcomuk[_daught_]co[_daught_]uk
Location: London, UK
Date: Wednesday, January 26, 2000 at 14:35:19
Comments:

Just stumbled on your site - If you're into this stuff, check out mine at the above address.

---

Name: Mark Raab
Email:gulliver[_a_t_]usinternet[_daught_]com
Location: Minnetonka, MN US
Date: Sunday, January 23, 2000 at 14:31:12
Comments:

Hi Mark, like your site, i'm experimenting with ionizing a species of atomic hydrogen gas, to separate an electron with electron affinity of 0.74 eV, I believe a 1 micron ND:YAG laser will do this so I may measure the ratio of H- ions to electrons in a hydrogen plasma. sincerely, Mark

---

Name: Ikhsan Setiawan
Email:Nashki[_a_t_]dejava[_daught_]net
Location: Yogyakarta, Indonesia
Date: Wednesday, January 19, 2000 at 07:29:55
Comments:

You are a very creative person

---

Name: Josh
Email:Noxious24[_a_t_]aol[_daught_]com
Location: Asheville, NC US
Date: Wednesday, January 19, 2000 at 02:00:46
Comments:

I was wondering if you had a picture or schematic of the power supply device you used for your NO2 laser. I have constructed a few of these lasers, but the power supply I am having a little trouble with. I was originally using a TV for the power supply (soldered a wire into the high voltage line on the back of the tube with a series of resistors inline after to slow down firing rate.But this is very large and dangerous Although it is nice being able to turn on your laser with a remote. Any information would be helpful... Thank you Josh

---

Name: Pam M.
Email:chriso[_a_t_]vnet[_daught_]ibm[_daught_]com
Location: Ajax, ON
Date: Tuesday, January 11, 19100 at 12:07:57
Comments:

Hi Mark. This is Pam, your old high school friend. I was looking for some info. about lasers for my grade two students and happened upon your site. I think they'll have to wait for grade 3 to read your work! Glad to see you doing so well. Your kids are very cute. I've left my husband's e-mail so you can let me know how any of our Centennial cohorts are doing.

---

Name: jules41100@aol.com

Date: Wednesday, December 22, 1999 at 13:40:55
Comments:

Was looking for a recipe for Slovak nut cake that I thought was called Roszky or Lolachky, thanks for your recipe!

---

Name:hartono
Email:hartono[_a_t_]teknologi[_daught_]ks[_daught_]co[_daught_]id
Location: cilegon, indonesia
Date: Friday, December 17, 1999 at 00:20:04
Comments:

its a good idea to write hobbies or "usable hobbies" in the web

---

Name:Joe
Email:nightwolf2000[_a_t_]yahoo[_daught_]com
Location: Pelham, ONT Canada
Date: Tuesday, December 7, 1999 at 23:36:50
Comments:

Mr. Csele, I'm disapointed. You gave us our quality education in the Hamster Dance, and the COW dance, but not one of those are in your links. What's up with that?

---

Name: Robert N. Schwartz
Email:schwartzman[_a_t_]att[_daught_]net
Location: Williamsville, NY US
Date: Saturday, November 27, 1999 at 19:14:13
Comments:

(a Buffalo suburb) Was looking for a Kifli recipe. Thanks. A nice website except the source info was empty.

---

Name: Kenneth
Email:Redpath
Location: Peterborough, SA
Date: Sunday, November 21, 1999 at 19:00:16
Comments:

I thought your site was very educational and it helped me on doing my science project and i thank you very dearly. my

---

Name: YOYO C.
Email:Ychung[_a_t_]webtv[_daught_]net
Location: Monterey Park, CA LA
Date: Wednesday, November 17, 1999 at 20:51:52
Comments:

Great site on your 80s music. I have a question....Where could I find a copy of the CD "RETRO NIGHT" ? I couldn't find it anywhere and also the CFNY's Spirit of Edge? If you could give me any hints on where I could find a copy that would be great!Thanks YOYO

---

Name:Gordon Foat
Email:foat[_a_t_]mcmail[_daught_]com
Location: london, uk England
Date: Friday, November 12, 1999 at 14:04:40
Comments:

You have so much good stuff here!!!!!! I want a laser now!

---

Name: Troy His#$*!%
Email:amct[_a_t_]geocities[_daught_]com
Location: Mississauga, ON CA
Date: Sunday, September 26, 1999 at 17:49:46
Comments:

I surfed to your site via an 80's search and I was quite amazed. You brief introduction (with samples)to the 80's was fantasitic. You hit on _every_ point that I could have made that would define the era. Thanks for the ideal stroll down memory lane! Troy

---

Name: Bryan Kivell

Date: Thursday, September 23, 1999 at 23:32:03
Comments:

I'm a first year student in your Technology and Society class. Just thought I'd check out your page. I must say that it far surpasses any of the other faculty page I've seen! You've obviously put a LOT of work into it and I like it very much. See you in class.

---

Name: Leon Lognion
Email:llognion[_a_t_]ih2000[_daught_]net
Location: Beaumont, TX USA
Date: Sunday, September 19, 1999 at 13:33:43
Comments:

I enjoyed your article, But would like to find a small Laser that can punch holes in a single sheet of paper or cut a single sheet of paper, could you give me any advice on this? With Kindest Regards,---Leon Lognion

---

Name: Leon Lognion
Email:llognion[_a_t_]ih2000[_daught_]net
Location: Beaumont, TX USA
Date: Sunday, September 19, 1999 at 13:31:14
Comments:

I enjoyed your article, But would like to fine a small Laser that can punch holes in a single sheet of paper or cut a single sheet of paper, could you give me any advice on this? With Kindest Regards,---Leon Lognion

---

Name:John-Paul Allen
Email:jpmkm[_a_t_]yahoo[_daught_]com
Location: Kansas City, MO USA
Date: Friday, August 6, 1999 at 19:33:11
Comments:

Cool page!! That I2K inverter is pretty neat. Thanks

---

Name: Ronald J. Bergeron
Email:sumguy14[_a_t_]aol[_daught_]com
Location: warwick, RI U.S of A
Date: Friday, July 23, 1999 at 00:13:01
Comments:

love science! I hope to be a physicist inventor. I have more ideas then you could shake a ten foot pole at.

---

Name:Stephen Urquhart
Email:urquhart[_a_t_]unity[_daught_]ncsu[_daught_]edu
Location: Raleigh, NC USA
Date: Thursday, July 1, 1999 at 17:00:07
Comments:

Hey Mark, how's it going?

---

Name: Dr. Abdul Razzaq
Email:razzaq[_a_t_]egr[_daught_]msu[_daught_]edu
Location: East Lansing, MI USA
Date: Friday, June 11, 1999 at 12:58:23
Comments:

It is of profound satisfaction to be in the field of ones choice and then excel in it. I got my Ph. D. in Physics and worked on thin films (CeO2, V2O5, Nb2O5). But I could not get chance to work further in this field. Iwish if Icould enter the field again. When I see the courses offered inthis field I just want to register and enter the lab again.

---

---

---