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Article #9136Re: 12V car --> 3V cd player
From: Roy Smith
Date: Thu, 27 Dec 1990 14:18
Date: Thu, 27 Dec 1990 14:18
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elrond@ccwf.cc.utexas.edu (hlista) writes:
> Does anyone have a schematic for a 12V DC to 3V DC 600 mA?
> Thanks for any help.
Seems like a perfect application for a 7803 three-terminal
regulator. Can't get much simplier than that. Should run you a couple of
bucks at Radio Schlock. If they don't have the 7803 (it's an unusual
value), they will probably have the variable version, which just requires
adding a couple of passive components to set the output voltage.
The only question is whether a 7803 is hardy enough to handle all
the horribleness that goes on in a automobile electrical system (I'm mostly
worried about voltage spikes). You might want to protect it with something
like a 20V zeiner across its inputs, and a 1-ohm power resister in series
with the input, after the zeiner.
--
Roy Smith, Public Health Research Institute
455 First Avenue, New York, NY 10016
roy@alanine.phri.nyu.edu -OR- {att,cmcl2,rutgers,hombre}!phri!roy
"Arcane? Did you say arcane? It wouldn't be Unix if it wasn't arcane!"
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Path: arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!clyde.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!rpi!sci.ccny.cuny.edu!phri!roy From: roy@phri.nyu.edu (Roy Smith) Newsgroups: sci.electronics Subject: Re: 12V car --> 3V cd player Message-ID: <1990Dec27.141809.2856@phri.nyu.edu> Date: 27 Dec 90 14:18:09 GMT References: <41842@ut-emx.uucp> Sender: news@phri.nyu.edu (News System) Organization: Public Health Research Institute, New York City Lines: 21