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Power Supply rigging

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February 19, 2003 1:05:28 PM

Hey all,

I've got a standard AT power supply that I want to rig for use as a regular power supply, i.e. for non-computer use. DOes anyone know how I would do that? (do i need to short certain pins on the motherboard connector or something? I couldn't jsut turn it on.)

-Kallenin

More about : power supply rigging

February 19, 2003 5:28:59 PM

at power supplys turn on with a regular switch. atx you have to short two pins on the atx connector. i think its the green wire and any black wire.

my computer is so fast, it completes an endless loop in less than 4 seconds!
February 19, 2003 7:25:02 PM

If there isnt a seperate switch, then it prolly means you got a weird AT OEM PSU, in which case you would need to find the pins to short out. You do mean AT, not ATX right?

<A HREF="http://service.futuremark.com/compare?2k1=5467618 " target="_new">Almost Breaking 12k!!</A>
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February 19, 2003 11:14:52 PM

So here's the detailed (albeit silly) situation:

I made an awesome fan array from case fans and power supply fans, and I want to hang it on my ceiling. I connected it to an AT power supply, and when I switched it on, the fans turned on briefly and then died. I tried plugging in the power supply to a motherboard, and then it didn't even turn on. I even tried connecting the 5V pin to the power good pin. Anyway, is the power supply probably funked up, or what? Could it have been wierded when I sprayed out the entire inside with a compressed air can? (ugh...dust everywhere...in thick globs...)

-Albert C.
a b V Motherboard
February 20, 2003 12:26:26 AM

Some late model AT power supplies had a smart switch which would detect the motherboard. I've tried for HOURS to figure out how to disable it. The other solution is to use an OLDER style AT power supply without the smart switch.

<font color=blue>Watts mean squat if you don't have quality!</font color=blue>
February 20, 2003 4:47:28 AM

Well here's an extra quirk:

When I turn it on without anything plugged in, it doesn't start up. However, the fan starts twitchting every second or so. I mean like literally twitchting. NOt going a few revolutions and stopping, but just a small twitch (or large quiver). Maybe a fuse is half-blown, or some capacitor is busted? It semms that maybe it isn't "charging up" properly? (the capacitor, that is)

-Kallenin
a b V Motherboard
February 20, 2003 5:43:40 AM

No, that's normal for an AT power supply that has the "smart" switch that tries to detect the board.

<font color=blue>Watts mean squat if you don't have quality!</font color=blue>
February 20, 2003 4:14:26 PM

You might want to try this to see if that by-passes the motherboard check: the first pin of the mobo plug is the power good wire, connect that one too the ground (black) and see if that works.

My dual-PSU PC is so powerfull that the neighbourhood dimms when I turn it on :eek: 
February 23, 2003 3:55:49 AM

AT suppies normally need a load of at least 1-2 amp on the +5V to operate, which you can provide with one 5 ohm, 20 watt resistor or a pair of 5 ohm, 20 watt resistors in parallel. 10 ohm, 10 watt resistors are more commona and can be combined in parallel for identical resistance and power ratings.
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