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PSU PC what voltages?

Discussion in 'Electronic Design' started by Dirk Bruere at NeoPax, Oct 26, 2011.

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  1. When the PC is "switched off" by the button connected to the mobo the
    PSU goes into a quiescent state, yet must supply voltage to the mobo.

    What voltages are active on the PSU, and what only comes up when the
    mobo powers up?
  2. Seems so - just been googling:

    I need a PC to turn on mains to an amplifier, so just connecting a mains
    relay to the 12V of the PSU ought to do it. When the PC is up, so is the amp
  3. Joerg

    Joerg Guest

    AFAIK only the +5V standby rail is present, all the rest comes up after
    you press the power button on the computer.
  4. qrk

    qrk Guest

    standby 5VDC, pin 9.
  5. Nico Coesel

    Nico Coesel Guest

    I'd use a 5V relay connected to a USB port. Doesn't require tinkering
    inside the PC and it will work with any PC.
  6. Yes, bomb makers always use international color coded wires.
    And bright red LED timers.

    The EOD guy never thinks to simply remove the explosive from around the
    (single) detonator.
  7. No, it's just an AV system based on a computer.
    So rather than have multiple power switches a mains relay actuated from
    the +12 should be sufficient to route power to the amps
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