User talk:RogerAF

From OpenCircuits
Revision as of 20:53, 17 December 2007 by 38.99.101.134 (talk)
Jump to navigation Jump to search

tour de cure cabelas hamburg pa bbw bdsm stockholm school of economics doraemon mp3 suckmebitch.com discount kitchenware oops tits home water filter beautiful bare butts rusty cage ps2 videogames what are the numbers mobile phone videos downloads buy fen phen replacements rain man gorillaz - feel good inc. men cocks auntie jane minivan hire pollution maritime new york city luxury apartments amateur exhibitionists pull ups for teens staremagazine all that remains naked pregnant girls flash-software mastiff neopolitian sensual massage in nyc free masturbation machine video beast love pagent potty training help utah realtors super prostate formula tabletop fountains nevada ranch for sale sony dcr-pc109 minidv camcorder sodium chloride female ejaculation techniques rv trailer tire 737 800 panel storkcraft rochester cognac crib with drawer free forum ssh tar backup maine state music theater brunswick me pireli tyres medieval japanese swords lolitia naturist couples freegranny in the summertime audrey tatou ladies leather clothing missy elliot life story inspirational flash movies air freight age of aquarius 5th dimension www.tawneestone.com nude naked women letter of resignation class ring tankinis what was the old regime trudeau airport departures yue 311 down hardcore ebony blowjobs ladies antique wrist watches lower ab workout statistics drunk driving deaths abs exercise free incest clips texas state bar constellation perl constants strict preteen webcams hot chicks in thongs red cross quilts white firewire cable htpc inside her pussy brand name products onion butts hardcore lesbians sex yourspeed 2.3 adultsexstorylinks x ray diffraction introduction vancouver tourism panty lovers interior decorator view property cashiers nc the gorillaz on call working sakowitz village dallas pontiac grand am liger from napolean dynamite horse teen support bracelets uk quark stars hot asains big k mart store verizon wireless family plan gay marine detroit lakes car lots real estate florida team losi parts bestiality comics rio bravo las vegas health care jobs shane world 34 miami famous love quotes nude at the pool ernest hemingway biography suicide alcatel space france craigslist portland online breast movies caribbean bikini dare preview wet milf tablecloths discount zanaflex cow statues couple swapping need sex university of michigan consumer sentiment hawaii spa retreat saltwater lighting lhsc 11 year old free nude beauty credit card processing center paulding ohio news lick asshole escaflowne pictures of 13 year old girls nude noir hentai exchange group calendar sexy fantasy art motorola razr silver felix da housecat amc mercado 20 address full bush muzzle loaded civil war soldiers monster hunter combo list visual studio 2005 beta download prescription weight loss pills Aloha from Honolulu, I have several areas of interest. I've been servicing recording studios here in honolulu, since the late '80s. Also concert sound, video projection, and theatrical lighting systems. I play electric rock-blues guitar and know what guitar players want from their Marshall amps. And I do recording engineering and production, so I know what recording engineers need from their monitor amps and speakers.

I have several projects I'm currently working on. And several ideas I want to develop ito new projects. I was thinking about some of those when I came across this site. It seems so serendipitous, I just had to join and write something.

I've spent the last week or so working on PC board layouts of several voltage regulator designs I've built and used over the years. I built a replacement for a recording console power supply regulator, that has been working now for near 10 years. I couldn't find the high current regulators that the original design used, so I used a pair of 723 ICs and external pass transistors and made my own substitute. The 723 has been bery bery goot to me! I used another pair of them to make a bench supply that adjusts from 12V to 35V plus and minus are individually adjustable and the pass devices have a 20A rating. I use this to experiment with various discrete op amp designs. A modern version of the Jensen 990 is my goal.

I've also recently built my first switchmode regulator based on TIs TL494 PWM controller IC. My experience with switching regulators is limited. I never had to repair one, only replace the complete unit, so I'm having to learn about them on my own. I've collected a lot of documentation and learned about buck, boost, buck-boost, fly-back etc. But it is all "book learning" as opposed to "hands on" at this point.

I thought these regulators might interest someone. I will post the schematics and artwork here eventually, but I need to find out more about how that is done. If anyone is interested, let me know.

Aloha, RAF

welcome

Aloha, RogerAF. Welcome to Open Circuits.

I hope you enjoy reading OpenCircuits and sharing your knowledge with us.

A few tips:

  • You can "sign" your contributions by typing four tildes "~~~~" at the end.
  • Be bold with your editing. If you add information that really belongs on some other page of this wiki (or on some other wiki entirely), or you accidentally delete some crucial stuff, it's fairly easy for anyone to fix it. Please feel free to revert or otherwise fix-up any of my edits that turn out to be erroneous and/or misguided.
  • We are all volunteers here.

Thank you for sharing your experiences here. I also have a bunch of "book learning" about switching regulators.

Have you seen National's "simple switcher"? The web application is nice for taking specifications like "up to 3 A output current", input voltage, and output voltage, and rapidly converting it to a circuit that National guarantees will work -- rather than fiddling around with prototypes for a few days.

Have you seen The 3-transistor Black regulator? Or the 5v to 13v Converter also by Roman Black? It makes me wonder why I used to think switchmode regulators required a complicated IC to control them.

Should we start a page on switching regulators here at Open Circuits?

--DavidCary 00:35, 18 May 2007 (PDT)



Hi David, In response to your question re a switching regulators page. I'd vote yea and expect that a linear page should be its partner. Given that the two types are so different in approach and conception. Linear regulators are very easy for me to understand, because of my years with audio equipment--most of which used linear supplies. Switching supplies are found in audio processing units, but the repair was generally to swap in a new card rather than trouble shoot for bad components.

I haven't done anything with switching regulators other than building my first with a TI TL494 PWM controller IC. I looked at Roman Black's designs (Thanks for that turn on) what elegant simplicity! I'm in awe. I am happy to contribute to a linear regulators page--I have several discrete opamp based designs for dual tracking supplies etc. I'd like to see more switching designs, to expand my own knowledge and raise my conciousness. I've peeked at National's online design software, but never took the time to try anything.

I have a little project that requires 3V, 5V, and