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Old June 23rd, 2003, 10:12 PM   Digg it!   #1 (permalink)
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ATX PSU pinout question.

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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Old June 23rd, 2003, 10:15 PM     #2 (permalink)
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So you want a hot at all times? Not just when the PSU is on?
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Old June 23rd, 2003, 10:23 PM     #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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Old June 23rd, 2003, 10:28 PM     #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.

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Old June 23rd, 2003, 10:37 PM     #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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Old June 23rd, 2003, 10:38 PM     #6 (permalink)
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neat
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Old June 23rd, 2003, 10:41 PM     #7 (permalink)
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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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Old June 23rd, 2003, 11:12 PM     #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.

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Old June 24th, 2003, 12:26 AM     #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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