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From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: 12V car --> 3V cd player
Message-ID: <1990Dec27.214353.10618@athena.cs.uga.edu>
Date: 27 Dec 90 21:43:53 GMT
References: <41842@ut-emx.uucp> <1990Dec27.141809.2856@phri.nyu.edu> <1739@sun13.scri.fsu.edu>
Organization: University of Georgia, Athens
Lines: 12

Well done. One can add that...

(1) There is no such thing as a 7803.

The circuit with the LM317 looks good. Another alternative would be
to use a 7805 followed by a series of diodes, each introducing about
0.6V additional drop.

(2) The 317 does not absolutely require a capacitor across the
output, but putting one there will help to reduce noise.

(3) If you're worried about meltdown, put a fuse upstream from the 317.