I've simply put a resistor (with sufficient power dissipation) in the
+5V output. No problem so far.

Usually, the +5V output is regulated, and the other outputs (-5, +12,
-12) are not. They depend on the closed loop regulation of the +5V out.
So expect some fluctuations in this lines.


-----Mensaje original-----
De: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]
En nombre de Alan B. Pearce
Enviado el: lunes, 24 de marzo de 2003 10:09
Para: PICLIST@MITVMA.MIT.EDU
Asunto: Re: using a PC power supply


>We are trying to use a power supply from an old PC, and it looks like
>it needs a certain amount of load in order to operate.  Our application

>involves switching between several loads, and since some of the loads
>don't consume much power, the power supply simply shuts off.  Does
>anybody know of a way to modify the circuit, to avoid wasting energy?

This is one problem with some of the early PC power supplies. Often the
power supply fan was rated to draw sufficient power to be the minimum
load. It generally does not need a lot of current draw to keep the
supply working.

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