PSN-L Email List Message

Subject: Re: computer power supply
From: "Raul J. Alvarez" ralvarez@........
Date: Wed, 05 Jan 2000 09:28:30 -0700


Christain,

I suspect that you would have a lot of problems with hash (electrical noise)
from this supply. This type of supply is a switcher.  You probably be better off
getting a +- 12 or 15 volt transformer type supply.

Raul Alvarez

Bellvue, CO

Christian Parker wrote:

> Has anyone here ever tried to use the power supply from an old PC to power
> their seismometer electronics?  I have one laying around so I was going to
> give this a try.  The power supply outputs +12vdc and -12vdc from one of the
> connectors that normally connects to the motherboard.  The pinouts of this
> connector are as follows:
>
> Pin   Name    Color    Description
> 1     PG      Orange   Power Good, +5 VDC when all voltages has stabilized.
> 2     +5V     Red      +5 VDC (or n/c)
> 3     +12V    Yellow   +12 VDC
> 4     -12V    Blue     -12 VDC
> 5     GND     Black    Ground
> 6     GND     Black    Ground
>
> I'm wondering if this power is suitable for powering op amps?
>
> Christian Parker
> Boulder, CO
> cparker@...............
>
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Larry Cochrane <cochrane@..............>