User talk:RogerAF

12 ekg lead picture miniature daschunds anthill pro fuji digital camera san diego swimming pool contractor handicapped vacations maine lobster fest date state bed in a bag comforter set cheap complete skateboard invalid file name for iis unicode map file shrink undo tablespace working for eli lilly and company skateparks itch tooheys super 12 extra large angus bull creek red mantel clocks wawasee high school syracuse polk county 2007 2008 pls result upcat how to make wine vinegar paige davis from trading spaces sunday school interior wall fountains preschool cincinnati pocket watch price guide arial image lookup reverse phone numbers rust protection aol keyword name i want a man who stands beside me college community district maricopa airport holiday inn des moines iowa employment screening background check overall run kangaroo air line tickets lesbian banging rubbermaid shelving girl videos san juan marriott stellaris casino hot pose active arizona community retirement antes de depois e foto protese silicone lufthansa ticket 2006 conference development human sid dillion chevy rca television repair part amateur reality porn negril 390 engine ford part sativa appreciate time green card lottery thomas lawson price shillelagh open minded music tony awards pinnacle software laguna mountain san diego power rangers dino thunder photos yalta conference 1945 open up the window noah hosting package cheap web 14 year old girls nude low interst rate okemo vt marcel schumann cards run dmc mp3 lake okeechobee fishing 2006 best driver golf ak 47 zabasearch.com wholesale unfinished wood box bustier lingerie puget sound pet pavilion merced school employees fcu penile implants volunteers of america lyrics asss mp3 music sitar unique personalized gifts hollisterco.com keratosis pilaris treatment dyspnea modern mailboxes sliding screen door kidjo tour county eulas taylor washington automobile claim injury version wireless internet jay lo lamba manisha customer service consultants arts and craft julie peterson patio covers bonsai curly david .com emilio botin santander electronic thesis submission soka edu tiedman government auction cheap tires cheer leader balinese wood carving postcards printer in time lyrics robbie robb dita san diego escorts review las vegas softball league judges in the supreme court mervyns.com dental equipment supply wholesale provveditorato agli studi di foggia medical information windows xp cracks free beast sex gallery industrial cordless vacuum cleaner formflow download aol quick buddy ob gyn lowell massachusetts findlaw old bath house pacific grove 1991 dodge dakota transmission act jerkey boys soundboard pyrenees lab attraction skegness tourist estate lead lead loan marketing mortgage network real keygen bejeweled 2 custom tile murals mtv2 city search magicien treatment for large facial pores bmg sterick building memphis jack crain knife micheal w smith biography home napa rent criminal record lindsay lohan nip slip pic large dog statues nude mom family aaa wholesale trophy promoting business painting kitchen cabinets 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.

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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)

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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