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Old 28th April 2003, 10:40 PM   #1
diyAudio Member
Join Date: Feb 2001
Location: Mars
Default Any ideas for +12v regulator ?

I need a regulator idea, voltage input is 100 volts, need
12v out, 1 ampere. Preferably not taking up much printed
circuit board space.

Most of the common regulators I find have only 30v input

The regulator will power some op-amps and comparitors
for amplifier protection circuits and also drive a +12v relay.

I probably don't really need 1 ampere, but just in case.

Got any clues?

The only thing that comes to mind is a zener/resistor/transistor
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Old 28th April 2003, 11:24 PM   #2
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Join Date: May 2002
Location: wheeling illinois
Unless you plan on building a switcher which would be really
bad for audio use, the linear pass regulator no matter how
it is designed is still going to dissipate 88 watts of heat.

You need a different idea...
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Old 28th April 2003, 11:26 PM   #3
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Location: boston Ma.
Default 12 V

You need a few resistors (maybe 1W) for a divider network, get it to 40 V., or some such.
I would get a wall-wart for that relay! seriously!
You have no need for the interference it would cause. That way your current will be maybe 40 ma, and the regulation will be a drop kick. 90 V is too far to drop at 1 amp. A 9V wart, since they usually have overvoltage, will probably work too!
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Old 29th April 2003, 12:00 AM   #4
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Default TL783

You could try a TL783 regulator this is a high voltage varible regulator it will take upto 150 v DC in and varable from 1.25 v - 125v DC at a quoted 700 ma properly cooled of course you should at least get half an amp from this regulator.
check the ti website out for more info ..

Hope this helps

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Old 29th April 2003, 02:58 AM   #5
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Location: Mars
Thanks for the tips.
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Old 29th April 2003, 06:32 AM   #6
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Join Date: Nov 2002
Location: Kent, WA

id either go with a small switching supply (the circuit isnt actually in the signal chain if its like most circuit protectors, so having a non-audiophile power supply shouldnt be too big of a deal), or i remember that theres a way to use lm317's to lower any voltage regardless of the input, but you can only have a difference of up to 35 volts between in and out. to get 100 to 12, you could use 3 or 4 of those in series. check a 317 datasheet to find how. a few opamps and a relay probably wont draw more than 100 ma, so the heat should be managable. good luck on the project.

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