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On 8/18/06, Grant Sewell <dcglug@xxxxxxxxxxxx> wrote: . Is it possible to daisy-chain two PSUs so I have the extra > power I need? I know that the ATX PSUs don't work unless connected to a > motherboard and the power-switch was pressed... I'm guessing a couple of > pins on the mobo connector would need shorting? Hi Grant, By Dazy chain I assume you mean connect in parallel. DO NOT DO THIS, if you connect two power supplies together they can fight as they both are attempting to get a given voltage, if that voltage is not 100.000000% the same the regulation circuits will both attempt to compensate and you will just drive large amounts of current from one PSU to the other. It is possible to connect *some* times of PSUs in parallel but they are designed specificy for this (and are not PC power supplies) It would be possible to use seperate PSU's to power different devices as long as you have A COMMON GROUND. Ie the black wires (of the two PSUs) should be joined together in ONE place. It is necessary to join one pin of the 2nd PSU to ground as well (PS ON pin 14) This is what the MB does to the PSU when you press the button to enable the 12V and switched 5V supplies. You could also join the two pin 14( green wires) together so that the MB switched both PSUs on together. But i would not attempt this kind of hacking unless you are confident in electronics and have approprate test equipment. Best regards -- Robin Cornelius http://www.byteme.org.uk -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html