June 2nd 05, 01:40 AM
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On 1 Jun 2005 17:16:26 -0500, wrote:
For testing purposes, I'd like to make an PC power supply operate when
NOT installed in a PC. I've heard that the AT supply needs at least
SOME load on its 5-volt output before it will operate; is an ampere
or two sufficient?
For ATX supplies, I visited a friendly computer-repair store today and
examined the "cheater" into which they plugged UNconnected ATX supplies;
it had three pairs of connections:
1) A jumper from Ground to PS-ON
2) an LED and resistor from PowerOK to Ground
3) two wires from +5V and ground going into something about the size
of a small box of matches which was shrink-wrapped to the cable
They wouldn't let me disassemble it !-)
Was there probably a 5-ohm resistor in that box?
I recall about a year or so ago, one of the ham magazines had an
article about converting PC power supplies for use as a radio PS.
Might be CQ or QST. The article gave specs on what youe are looking
for, but I do not remember details. If you are an ARRL member, you can
do a search on past QST articles on their website.
Happy trails,
Gary (net.yogi.bear)
--
At the 51st percentile of ursine intelligence
Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom
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