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  • ATX auto power on

    Is there any way to get an ATX motherboard to automatically power on when power is applied to it if there isn't such a setting in the BIOS? I know there are MB's that have a setting like the in the BIOS, but mine doesn't, and it's a pain to open the trunk every time and power it on.

  • #2
    Find the motherboard power-on pins (which the power-on switch connects to). You can either lengthen the old switch, or use a totally different switch (single pull single throw) The motherboard just needs a short connection between these two pins. I figured this out by taking a peice of soder and using it to connect the m/b pins.

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    • #3
      This doesn't work. It's the equivalent of holding in the power button. Any other ideas?

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      • #4
        Check back with me in a week. I am working on a modification to my powerup/powerdown board to have a small onboard relay that is momentarily activated for turning on ATX motherboards. See http://www.dschmidt.com/autooff.html for the current version of this powerup/down board.

        Dave

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        • #5
          how about a relay where the coil is powered from 12 volts but with a resistor/capacitor network powering the coil sothat it takes a little time for the coil to energise and short the relay contacts. time delay is 5 times the r c time constant.
          just an idea hope it works...should do...
          Volvo V40 Phase 2 2002. T4 turbo upgrade.... currently no mp3 or carputer..... researching options

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          • #6
            Hi all,

            I found a couple of circuits at the websites below that may just do what we want here! Have a look....
            http://www.aaroncake.net/circuits/relaytim2.htm or http://ourworld.compuserve.com/homep....htm#delay.gif


            Nev.

            [This message has been edited by nevb (edited 01-25-2000).]
            Nev.

            Squeezing MP3 technology into a Mazda MX5
            Web: http://www.neddynet.co.uk/mp3
            Email: [email protected]

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