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  How to 'jumper' a PC power supply? 
 
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Al James Aug 05, 2005, 06:30pm EDT Reply - Quote - Report Abuse
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I have a joemeek compressor (for music) and wish to power this using a power supply unit I salvaged from an old PC. (in case you're wondering the Joemeek unit was for an internal PC bay and requires the standard 4pin PC power supply to work).

The problem I am having is that I need to 'jumper' the bit of the power supply that attached to the motherboard but not sure how to do this? CAn anyone please point me in the direction of resources on the internet where I can learn how to do this?

Alternatively? Is it possible to power the joemeek just from, say, a kettle lead? I know the PC power supply carries 2black a yellow and a red wire but not sure how to do this, if at all possible?

Hope to hear from someone either way.

Thanks

Al James


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FordGT90Concept Aug 05, 2005, 06:39pm EDT Reply - Quote - Report Abuse
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Edited: Aug 05, 2005, 06:45pm EDT

 
>> Re: How to 'jumper' a PC power supply?
If I recall correctly, the red is a 12v, blacks are ground, and the yellow is a 5v. You could maybe take a 12v AC to DC converter and a 5v AC to DC converter and make your own but you need to make sure it can handle the amps. You could also try an older PSU that has has it's own power switch prior to motherboard controlling it (AT I think).

According to my motherboard manual, PS-ON# is pin 15 on 24 pin connections. PWR OK is on number 8. Not sure which grounds though.

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Reason   Aug 05, 2005, 06:40pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
i *think* this will help you; if i'm understanding correctly, you want the PSU to turn on without the computer, correct? if so, check out this link:
http://www.pc-mod.com/articles/atx/

fyi, the picture in that link is of the mobo ATX connector, not the PSU ATX connector.

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Al James Aug 05, 2005, 06:51pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
Thanks both of you for replying.

I should have said I am a novice with this stuff it sounds way too complicated.

Would this however work...if I were to take out the old PC motherboard and cut around the connector (for the power supply) of the motherboard with a stanlet knife then connect up the power supply to the cut down connector, i.e. discard most of the motherboard, and then lump it all together in a home made shackled together project box?

I know that the power supply does power up ok when I connect to the motherboard so I suppose my question is, can I cut away all the bulk of the motherboard and will it still work?

Al

FordGT90Concept Aug 05, 2005, 06:51pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
So for 20-pin, it's 14 and 15. For 24-pin, it's 16 and 17. Just like hot wiring a car (almost). ;)

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FordGT90Concept Aug 05, 2005, 06:53pm EDT Reply - Quote - Report Abuse
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Edited: Aug 05, 2005, 06:54pm EDT

 
>> Re: How to 'jumper' a PC power supply?
You should be able to just take a wire and stick it in those pin holes to see if it will start up. You might have to rig up a switch on the power on ones too.

I'll scan this image in if you think it'll help (mine is of the motherboard aswell).

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Al James Aug 05, 2005, 06:54pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
But to actually jumper do I actually 'cut' the relevant two wires? or what? I'm not sure like I say Im the village idiot here.

Al

FordGT90Concept Aug 05, 2005, 06:55pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
I wouldn't until you know that will work. Just take a wire with the sleeve cut off on both ends and stick it in the holes. Be careful you have the right ones though.

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Al James Aug 05, 2005, 06:57pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
okay I'll give it a go, many thanks for your help.

Al

Greg M Aug 05, 2005, 07:21pm EDT Reply - Quote - Report Abuse
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Edited: Aug 05, 2005, 07:28pm EDT

 
>> Re: How to 'jumper' a PC power supply?
Use a paper clip (bent 180) to connect the green and black cables on the end of the motherboard plug (WHILE THE PSU IS OFF and un-plugged!). They should be the 2 to the left of the little clip on the clip side (rounded edges).

Pic:
http://gandmcomputers.com/atxsoft.gif

EDIT: GREEN

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Max Steiner Aug 05, 2005, 08:20pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
In computer electronics & wiring, this is the following color codec:

+12v = yellow
+5v = red
+3.3v = orange
ground = black
-12v = blue
-5v = white
+5v (standby) = purple
POK = gray
PC-ON = green

So, to run the power supply without a motherboard present, you link the green (PS-ON) wire to any black (GND). I've used a plastic-jacketed twisty-tie with the ends exposed to test PS's... If you want something more permanent, cut the green and a black from the 20-pin ATX block, expose the ends, and either twist-cap them, or get a wire joiner.

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Al James Aug 05, 2005, 08:31pm EDT Reply - Quote - Report Abuse
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>> Re: How to 'jumper' a PC power supply?
Wow! what a wealth of knoledge, I really appreciate it all, thanks a lot. Will try it at the weekend.

Al


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