Ryan Weihl wrote:
Michael R. Kesti wrote:

Frank wrote:

I have a large board which asks for three power supplies, +3V, +3.3V and
+-5V.


If I read you correctly, that's four supplies: +3V, +3.3V, +5V, and -5V.

First two can be easily satisfied with two HP power supplies (each
has its own
GND pin also). Regarding +-5V, can I replace with an HP power supply
set to
10V, -5V pin connect to HP's ground and +5V to power?


No. Doing so would provide zero volts to the board's -5V rail and
+10V to
its +5 rail.

You need four supplies.

will an ATX supply not do?
rw

Maybe not. Compound switchers need a load on the main supply in order to
come up, and the auxiliary supplies aren't always well regulated.

Jerry
--
Engineering is the art of making what you want from things you can get.
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