Re: Using a PC PowerSupply as a bench power supply.


sid wrote:

I went out to our warehouse last evening and dug the PS out of two old
Compaq EVO (Convertible Mini/Desk top) units.
For the first time I found units that have specs on the outside of the
unit. Most of the small form factors that we have been using on
desktops for a couple of years don't have specs on the PS. (Sorry if
I was annoying anyone)

The units are rated at 250W with several of the legs being redundant.
Example:
+5v 11A
+3.3v 17A
+12v 5A
-12v 0.15A
+12v 7.5A
+5.05v 1.7A Aux <- ( I am assuming this is the stand by power)
+3.3v 2.2A Aux

From reading this I have two 12v legs with 5A and 7.5A. Can I use
those together to drive one circuit 12.5A ? Or should I keep them
separate ? The only reason that I ask before about the current on the
5v stand-by was because the one diagram show "max 10ma", and I wasn't
sure if that was enough to drive an Led.
Now that Compaq has been acquired by HP, I wouldn't even know where to
look for specs on a unit like this.

Thanks


Use a ohm meter to check for low resistance (less than an ohm)
between the two 12 VDC outputs. If it is low, they are the same supply,
and the current limits are due to the wire size.

As far as the '+5.05v 1.7A Aux <- ( I am assuming this is the
stand by power)', plug the supply in and see if you get five volts.

10 ma will light some LEDs, but why do you want to use the standby
output? It is always on, as long as the supply is plugged in. (If the
supply has a power switch mounted on the back of the case it has to be
on.) Compaq was good for using non standard power supplies, so I'm not
surprised by the 1.7 A rating. That power supply doesn't meet the
current ATX power supply, like a lot of cheap power supplies.

As far as finding specs, sometimes you can find someone selling the
same power supply, how lists the specs. What you listed above is most of
them, other than the rated operating temperature and humidity levels.
If there is a sticker with the OEM's name, see if you can find a
website, if you need more information. Generally, all they products are
the same in the product line, other than the individual current ratings.


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