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Any ideas for +12v regulator ?
Any ideas for +12v regulator ?
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Old 28th April 2003, 10:40 PM   #1
thylantyr is offline thylantyr  United States
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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
kevin gilmore is offline kevin gilmore  United States
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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
colwaiting is offline colwaiting
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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
ANTHONY2181 is offline ANTHONY2181  United Kingdom
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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 www.ti.com ..

Hope this helps

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Old 29th April 2003, 02:58 AM   #5
thylantyr is offline thylantyr  United States
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Thanks for the tips.
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Old 29th April 2003, 06:32 AM   #6
psychokids is offline psychokids
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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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