Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!pasteur!helios.ee.lbl.gov!ncis.llnl.gov!oodis01!uplherc!wicat!m5!keith
From: keith@m5.UUCP (Keith J. McQueen)
Newsgroups: sci.electronics
Subject: Powering PC from +12
Message-ID: <00112@m5.UUCP>
Date: 31 Jan 89 00:58:13 GMT
Organization: WICAT Systems Inc. Orem, Utah (Engineering-R & D)
Lines: 26


Does anyone out there have a circuit for producing the
necessary +12, -12, +5, -5 for powering an IBM PC from
a single lead acid battery?  The supply should provide
enough current to run a loaded PC with a hard disk drive,
and a 12 volt monitor.

The application is to run a packet radio Bulletin Board
System entirely from a single DC supply.  (We are using
low power trancievers... < 5 watts).

Ideally, the circuit should be fairly efficient, and 
handle low voltage (ie. less than +12 input) as the
battery runs down.

If possible, I would like to have the battery float
charging all of the time, with current draw only happening
when the power goes out.

I realize that I could probably get a UPS to do this,
but that is quite expensive, and not near as much fun.
I also believe that, since the computer runs on DC
anyway, a more efficient way can be found.

Any Ideas?


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| Keith McQueen, N7HMF            Organization: Wicat Systems, Inc.   |
| 1116 Graff Circle               Work (801)224-6605x422              |
| Orem, Utah 84058                Packet:    N7HMF @ NV7V             |
| Home (801)224-9460              Voice: 147.340 MHz or 449.675 MHz   |
|           Opinions are all mine...                                  |
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