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From: al@qiclab.uucp (Al Peterman)
Newsgroups: sci.electronics
Subject: Re: 12V car --> 3V cd player
Message-ID: <1990Dec29.070556.7022@qiclab.uucp>
Date: 29 Dec 90 07:05:56 GMT
References: <41842@ut-emx.uucp> <1990Dec27.141809.2856@phri.nyu.edu>
Organization: SCN Research/QIC Laboratories of Tigard Oregon
Lines: 21

In article <1990Dec27.141809.2856@phri.nyu.edu> roy@phri.nyu.edu (Roy Smith) writes:
>
>	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.

I can't vouch for 7803's but I am using 7809's to run my garage door
openers in both cars.  Never a problem.  

BTW - It's really neat having a working button on the dash to raise the
door.  Ther's also the security angle that if you get power from a
source that turns on with the accessories, someone can't raise the
door by breaking into your car when it's parked in the driveway.  Also
no need to think about opener batteries...


-- 
Alan L. Peterman                                   (503)-684-1984 hm
                       cse.ogi.edu!qiclab!al