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Old 28th April 2003, 11:40 PM   #1
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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
capability.

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
regulator...
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Old 29th April 2003, 12:24 AM   #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.
((100-12)*1)

You need a different idea...
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Old 29th April 2003, 12:26 AM   #3
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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, 01:00 AM   #4
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Send a message via Yahoo to ANTHONY2181
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

Anthony
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Old 29th April 2003, 03:58 AM   #5
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Thanks for the tips.
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Old 29th April 2003, 07:32 AM   #6
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Location: Kent, WA
hello,

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.

-chris
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