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Old Dec 12, 2005, 01:58 PM
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Germany
Joined Apr 2003
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Question
Starting PC Power Supply (AT)

Hi all!

I have an AT style PC Power supply. I used to use the entire computer it came from as a power supply simply tapping power from it (it was useless for anything else). This summer i had to move and threw the computer away only keeping the power supply to save space.

Now I want to start to use this PSU again, but I can not figure out how to start it. I've read at least 10 tutorials but none of them tells me what to do with the four wires the went to the power switch when the unit was installed in a computer. The colours are white, black, blue and brown. I suppose I want to short two of them to simulate me pressing the power button on the computer?

I hope my question was clear enough!

- David
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Old Dec 12, 2005, 05:03 PM
Master of 1 point landing
Naperville, IL
Joined Jul 2005
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An AT power supply or ATX? AT's generally stay on by themselves for an atx - jumper the plug as shown (red lines)
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Old Dec 12, 2005, 05:23 PM
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Western KY
Joined Sep 2003
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You can either short the wires or add a DPST switch.

The wires are:

Brown and Blue: Live and neutral feed wires coming from the 120v power cord to the power supply. When the power supply is plugged in, these will be HOT.

Black and White: These carry the AC feed back to the power supply when the switch is turned on.

Brown ------------->Black
............SWITCH.............
Blue --------------->White

When the switch is ON, Brown shorts to Black, Blue shorts to White.

Hope this helps.
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Old Dec 13, 2005, 03:05 AM
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Germany
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Exactly what I was looking for, thanks a lot!

Now, where's my soldering iron

- David

Quote:
Originally Posted by Andrew0820

Brown ------------->Black
............SWITCH.............
Blue --------------->White

When the switch is ON, Brown shorts to Black, Blue shorts to White.

Hope this helps.
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Old Dec 13, 2005, 04:16 AM
Fidler & twidler
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Cranfield U.K.
Joined Mar 2004
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Quote:
Originally Posted by bergfalke4
Exactly what I was looking for, thanks a lot!

Now, where's my soldering iron

- David
Some AT PSU's need a load on the 5v to keep it going - a 10w auto lamp should do it.
Mike
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Old Dec 13, 2005, 12:26 PM
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Germany
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It works! I had to put a 8 ohm 10 watt resistor between 5 volt and ground to increase and stabilise the voltage. I'm really happy, thanks for all advice!

- David
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Old Dec 13, 2005, 04:01 PM
Fidler & twidler
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Cranfield U.K.
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Quote:
Originally Posted by bergfalke4
It works! I had to put a 8 ohm 10 watt resistor between 5 volt and ground to increase and stabilise the voltage. I'm really happy, thanks for all advice!

- David
good
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Old Dec 13, 2005, 05:21 PM
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this worked for me with an atx style psp

http://www.rcgroups.com/forums/showthread.php?t=368639
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Old Dec 23, 2005, 09:27 PM
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USA, NM, Belen
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I have a Compaq supply, series PDP-115. I can't get it to start. It has a different plug from the one in the above post, two rows of 7 pins,Marked P1,a 4 pin marked P2, and then 2 4 Pin in series. It has 5v and 3v, but no 12v and the fan does not run. Does someone know how to start this one. Thanks Mike
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Old Dec 23, 2005, 10:08 PM
just look at it smokin'
z-matrix's Avatar
Joined Dec 2005
1,233 Posts
Quote:
Originally Posted by ImaBiggles
An AT power supply or ATX? AT's generally stay on by themselves for an atx - jumper the plug as shown (red lines)
i was only using ps_on (green) to ground and it worked perfectly...
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Old Dec 24, 2005, 03:25 PM
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USA, NM, Belen
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Compaq PS

I got the compaq to work and it will run my Apache 2500 OK. The green wire is +5v. I jumped it to the white wire and the +12v would come on but it would cycle on and off at about 1hz. Put a 10 ohm load on the 5v as some one suggested and the power supply is stable although the cooling fan does not run. Nothing got hot while I charged a 1300 2cell. I am happy and thanks to all on this thread.

Mike
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Old Dec 24, 2005, 03:47 PM
Fidler & twidler
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Cranfield U.K.
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Quote:
Originally Posted by zbend
I got the compaq to work and it will run my Apache 2500 OK. The green wire is +5v. I jumped it to the white wire and the +12v would come on but it would cycle on and off at about 1hz. Put a 10 ohm load on the 5v as some one suggested and the power supply is stable although the cooling fan does not run. Nothing got hot while I charged a 1300 2cell. I am happy and thanks to all on this thread.

Mike
Glad we helped.
Mike
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Old Dec 24, 2005, 03:54 PM
Fly it like you stole it..
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Florence, Al
Joined Oct 2000
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I always just plug an old hardrive into the PSU and it thinks it's up and running..
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