ATX PSU pinout question. 
June 23rd, 2003, 09:12 PM
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#1 (permalink)
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Anybody know which pin/wire on an atx psu is always hot when it is plugged in? I'm working on a little mod here and it would come in handy  | 
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June 23rd, 2003, 09:15 PM
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#2 (permalink)
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Join Date: Feb 2003 Location: Buckhannon, WV
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So you want a hot at all times? Not just when the PSU is on?
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June 23rd, 2003, 09:23 PM
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#3 (permalink)
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Yeah, I need the one that is +v when it is plugged in. I have an old keyless entry system from a car and I am going to see if I can get it to start my computer  | |
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June 23rd, 2003, 09:28 PM
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#4 (permalink)
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Keyless entry from a car to start a computer? Easy!
Wire up the receiver to a NO momentary relay and have the relay close the "power switch" poles on the mobo.
-Kc2iLq | |
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June 23rd, 2003, 09:37 PM
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#5 (permalink)
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Kc2iLq, Thanks, but I have that part figured out. I just need to know how to get power to the receiver when the pc is off  | |
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June 23rd, 2003, 09:38 PM
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#6 (permalink)
| | Ultimate sumfin i guess
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June 23rd, 2003, 09:41 PM
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#7 (permalink)
| | Did you try Google yet?
Join Date: Feb 2003 Location: Buckhannon, WV
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Get out your trusty DVOM and start checking. Shouldnt take but a few min to find it. I found a PDF of the ATX spec but its overly technical. | |
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June 23rd, 2003, 10:12 PM
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#8 (permalink)
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Pin #9, +5VSB (purple wire), max current 1.5 amps on a 300W power supply. This can be found in section 3.3.3 of the ATX12v Power Supply Design Guide. You can download the .pdf at www.formfactors.org.
Mike
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Last edited by Xeroid : June 23rd, 2003 at 10:15 PM.
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June 23rd, 2003, 11:26 PM
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#9 (permalink)
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Thanks Xeroid, It seems to be the right wire, but it's not enough juice to close my 12v relay  I guess I am going to have to try to find a 5v somewhere.. | |
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