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Old 21st July 2004, 08:51 PM   #1
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Default Building a simple dual powersupply


To date, I've just built a few simple mic preamps, all portable, so battery powered...

But in my next project (phono preamp) I'd like to build the power supply too.
I read a few things on power supplies, but finally I lost patience and would like to start rather yesterday than tomorrow
My op-amp circuit wants a dual powersupply, and I wonder which way to go:

(I don't mention rectifier nor caps as this isn't concerning the problem...)

Should I use a simple transformer and an IC which does the rest for me: splitting and regulating the (DC) voltage at the same time (e.g the LM325 or the RC4195). That would result in fewer parts.

Or am I better off using a transformer which gives me 2 voltages which I feed into two separate regulators? More parts, but possibly some advantages...? (e.g the one on rjm's site: - you have to scroll down for a bit)


PS. oops, just saw the LM325 is obsolete (It figured in Horowitz /Hill)
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Old 22nd July 2004, 12:38 PM   #2
rabbitz is offline rabbitz  Australia
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Have a look at Rob Elliotts Project 05.
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Old 22nd July 2004, 01:14 PM   #3
sek is offline sek  Germany
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And make sure you studied the datasheets of the standard regulator ICs that come into play here: LM317, LM337, LM1086, etc...

I'd go for the dual version, as you don't have to save each millivolt or -watt in a line power supply, while saving money and time is worth the couple of extra parts and board space.

You'll find plenty about such power supplies on diyaudio, just do a ('nother) search. Care for low noise, efficiency and maximum power are unimportant for your application. Most people (and manufacturers) just implement the manufacturer's standard schematics to get started, then do some custom modifications.

You can - of course - do some more research and read about the Jung "super" regulator.

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