User talk:RogerAF

From OpenCircuits
Revision as of 11:39, 13 December 2007 by 201.28.97.8 (Talk)

Jump to: navigation, search

nicotine lozenges sheep pussy anna nicole smith exposed movie huge and hung oxazepam disturbing sick shit alan jackson ringtone no audio sound to my computer jpeghunter cum swapping girls black ass sex underground sex golf training aids fireflies naked preteen model cunt licking chat photo ringtone tagged teen user vote caramel mp3 grandmaster flash p910i ringtone diabetic recipes ellen pompeo freepornpictures smile now cry later preteen incest stories incest stories i730 wav ringtones recipe for italian pasta dish monophonic ringtone rock college girls in spring break disney pixar collection ringtones las vegas convention center lean manufacturing training houston metro bathroom fan berries potty training autograph authentication tickling kids shower babes porn magazines missouri marriage records online fff christian chat harry potter ringtones verizon national arbitration council girls sucking tits pumping tit for milk ringtones motorola v220 free diabetic adult baby girls free ass movies 747 capacity kelly brook nude gorgeous french girls auto insurance companies recumbent bike eva airlines website buttons jobs part time hose preschool online games baby pussy computer deals georgetown university plugg clothes pvc cutting gi joes car nonverbal learning disability option one mortgage micheal buble panerai replica watch university of wisconsin hip hop real ringtones antartica lehigh county community college sony digital camcorders ho ho ho tight sexy outfits mortgage processor florence hotel reservation fujifilm digital camera window xp spread leg gallery kate mulgrew nokia india free ringtones lesbian,hardcore ship car hot n horny gushers teryl rothery awsome american motors goku banging bulma in the shower corporate team building program free sidekick 2 hifi ringtones halle barry female nudist galleries cheerleaders having sex cellular game link phone ringtone world.t35.com multipal listing service kinder tropical shirts chernobyl mortgage investor lapel pins myfamily.com free downloadable ringtones for sprint pussy upclose gap analysis preteen model pictures couples counseling free latest bollywood ringtones lg 8100 ringtones west virginia division of forestry shock nookie galleries postal zip codes pimsleur culinary schools gay men kissing article on the glass ceiling furniture for sex kitchen aid 5165 downloadable free nokia ringtone russian revolution audio editing software best fine ass girl intercourse for the first time positions for sex during pregnancy nokia 6600 ringtone game jockstrap locker room free cingular ringtones and wallpaper international model l-b engine process recordings miami florida realtor in ericsson j200i ringtone sony jackoff professor angelicus visits the big blue ball 2 nice girls kid underwear models aol chat rooms speculation on stock market celtic music funky ringtone town free ringtones for nextel i730 8615 audiovox metro pcs ringtone family guy wallpaper prank call pictures of childhood obesity medullary cancer psx austrian free ringtone for motorola t720 make ringtones for nextel porn 89 buckingham palace adult theater staunton virginia babe forum kerissa fare motorola ringtone safe driving mail.yahoo.com likemynudebody female private parts myspace.com rodriguez site tablecloth young gay teens everybody dance now real ringtone ninfeta desert combat painting tools free porno picture rs 6015i nokia ringtone rental agreement lg 5550 ringtones xposed.com sir isaac newton new jersey phone directory free femdom stories lauren jackson woodstock ny map missing lg ringtone vx4500 ampland, sending sms ringtone asian oral sex mood swing wild phone company in canada dildo anal black cunts women masturbating with dildos boeing 747 bouquet moviesguy hot bitches fucking hook 6610i nokia ringtones patio cover lingeries dating adult cialis online gem stones free resume cover letter examples free download nokia 7710 games fta files zoom airlines wireless keyboard mini juegos double penetration video cozaar buy propecia map rosacea female feet bastinado mp3 free music download colleges yandex tom tom satalite navigation fun pictures free download able music free adaware spyware gay gang bangs seasonale birth control medical terminology free porno movies to download cnc programming celebrity pussies hyundai replica coach purse nadine crossdressers gayboy natalia cruze celebs disney coloring pages free downloads of sex films free phone chat numbers leather coats yellow page depakote withdrawal symptoms free birthday e card windows xp repair utility razor pocket mod bistro scooter curtain exchange ford model t drivers license power amplifier tiaras lovenox voltaren lawn dice chevy avalanche motorola phone pink razor live video chat room asian girls spanish translate wireless phone directory cheap airlines ticket free music downloads without a membership sports federal express natural breast lincoln aviator rims daewoo young russian woman american west airline bionicle puzzle game nissan outboard motors dress fashion girl game up nissan murano sex amateur sun country airline break dance video lucas oil gucci blondie handbag kia picanto sex photo cordless drill garage buildings making money online wwf wrestling figure pornosex buy xenical online henri matisse painting gucci eyewear adult animation hockey denise masino adult search porsche parts online david bridal seiko kinetic watches unique wedding cake native american single antivirus clip free porn bridesmaid gown tattoes live sex cams dog breeds tapestry tequin cheetah girl home garden car audio autoparts girl on girl shoe printable calendars pictures couples fucking sexy lesbians airtran kinerase sexy costumes candida cleanse teen naturists football plays pixma dowload mp3 music tent instructions diet pills tenuate toyota cars climara pornstar motorola cell phone us airway romantic gift household credit card services earthquake safe house quotes mobile home parks for sale apple promo savings code sex movie holidays to new york ebony sex disability living allowance novelty national city bank cleveland ohio customer service table setting long hair chanel sun glasses discount airline ticket online mature asian porno octagon tables china airlines tarot cards senior pussy opiate detox womens picture car classic grundy insurance nude teen shopping bag voyeur movie chevy venture phone number search t mobile free web cam sex chat chris brown layouts wireless internet truck rent sexy jeans cell phone number directory amazon books bootie jelqing video bea flora fotos xxx flovent tonneau cover lesbian videos fast cash fasfa delta airline com credit card for bad credit paris hilton papa johns promo code buspar and side effect digital wallpaper kitty canon game calligraphy font videoporno park home insurance used garbage trucks for sale plastic pants weed xena argentina food double penetration video map of florida hydrocodone gymboree outlet fireman costume teen pussy galery free fuck pics barbie ring tone for motorola razor cupid xiaolin showdown seniorsex hawaii rentals sears furniture mega tits bodybuilding laughlin hotels cheaters uncovered united airline flight ponchos sexual enhancement canada payday loan sex vibrator hacker gay cock flowmaster seroquel and side effect southwestern bell phone company prom dresses sears furniture wrought iron sign bracket hud listings adult dating service colorado springs real estate liposuction photos color contacts mozilla firefox porno films free property title search lil bowwow windows xp repair utility dentists oakland california juegos gratis online sex game hustler lawn mower amateur web cam cold turkey to quit smoking engagement ring cupid sexy pornstars ballistics pitbull bmw picture air plane crash pat wynn healthmark inversion table anal sex with my wife sex godess bit torrent above ground pool filter sauna infrared animal planet buy esgic plus online dating adult coleman furnaces laser tooth whitening schrei myspace music player code free xxx sex canadian chat line university of michigan ann arbor anal probe jail motorola cell phone cover naturalist abc distributors cash advance loan free ways to make money online arabic ringtones mintek firestone pond liners tattoes sony fx1 symptoms shingles philippine online radio station ringtone for verizon what is lorazepam neurotin lycopene supplement windows xp sex party swimming exercise amateurs fucking indian dating site income taxes cheap clogs govt jobs male celebrities free downloadable music free porno movies to download orgasm pics levothyroxine antibiotic dlp tv amateur guaranteed approval bad credit loan aloha airline home exercise equipment 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

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox