Xref: utzoo rec.ham-radio:22050 rec.ham-radio.packet:4120 sci.electronics:12929 Path: utzoo!attcan!uunet!samsung!usc!apple!vsi1!teda!ardai From: ardai@teda.UUCP (Mike Ardai) Newsgroups: rec.ham-radio,rec.ham-radio.packet,sci.electronics Subject: Re: Running a PC on 12V Message-ID: <11362@teda.UUCP> Date: 17 Jul 90 14:08:34 GMT References: <31677@cup.portal.com> Reply-To: ardai@teda.UUCP (Mike Ardai) Followup-To: rec.ham-radio Distribution: na Organization: Teradyne, EDA Lines: 19 In article <31677@cup.portal.com> dbell@cup.portal.com (David J Bell) writes: >[...] the electronics requires both +5 and -5 volts. Before going crazy hacking a -5 volt source, make sure that something in the machine really uses it. It was originally used as the substrate bias voltage for the 4116 (16K) DRAMs that were on the original motherboard. The only card that I have seen lately that uses the -5 volt supply is the MicroMint imagewise PC frame grabber. Same with the 12 volt supplies, but they are used for serial ports. I would regulate the 12 volt supply, and as for anything that goes into a car, use a noise filter and big zener clam or crowbar, since you can get some really nasty spike. /mike >Dave dbell@cup.portal.com -- \|/ Michael L. Ardai Teradyne EDA East --- ------------------------------------------------------------------------- /|\ ...!sun!teda!ardai (preferred) or ardai@bu-pub.bu.edu