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Thread: Desktop PSU rating

  1. #1
    Maximum Bitrate buurin's Avatar
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    Desktop PSU rating

    I modded my desktop PSU to connect it to my m1atx... I needed 2 12V(Pwr and Ign) lines, and a gnd.

    I took a 12V and gnd from one of the 4pin molexs, and another 12V from another molex

    I wired the 12V ign through a switch so I can turn the pc on/off. I turn the PSU on by shorting some pins on the big atx connector

    This setup worked once... Now the PSU turns on(fan runs), and there is 12V on the lines I have wired up but the PC does not come on. I was wondering if perhaps the 12V lines I took from the 4pin molex does not source enough current to run my pc... Should I take the 12V from the big atx connector?

    Thanks
    B Smoov
    Project Status: 90% Complete

    Next Step: TIVO for Radio

    Ampie Case :: MII10000 Mobo :: M1-ATX PSU :: 512MB RAM :: 2.5" HD, 60GB, 5400rpm, 16MB Buffer :: DWW-700H :: Centrafuse

  2. #2
    Maximum Bitrate mushin's Avatar
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    Your problem may be elsewhere... Because the way most PSUs are designed (to save cost), they are not capable of outputting their full rating on the 12V rail unless the 5V rail is also adequately loaded. This has been causing some problems in standard system with high-end graphics cards too, where the 12V load far outstrips other loads.

    Still, I find it odd that it stays on and you're reading 12V. The problem may be with your m1atx. Does it still work off your car batt?

  3. #3
    Maximum Bitrate buurin's Avatar
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    Yeah it works on my car battery... I was scared it wouldnt after it stopped working w/ the desktop PSU.

    Interresting info about the 5V rail load... Hmm.. That sucks...

    Any ideas for easily powering up my CarPC in my house? Ideally using a desktop PSU, but i suppose I am open to alternatives (except buying a car battery to sit in my living room )
    B Smoov
    Project Status: 90% Complete

    Next Step: TIVO for Radio

    Ampie Case :: MII10000 Mobo :: M1-ATX PSU :: 512MB RAM :: 2.5" HD, 60GB, 5400rpm, 16MB Buffer :: DWW-700H :: Centrafuse

  4. #4
    Fusion Brain Creator 2k1Toaster's Avatar
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    The 12volt off the big ATX connector should supply enough juice. Try that. You can get a 20pin ATX pin voltage chart from here I believe.
    You could also try a 12v transformer from Radio$hack for pretty cheap or rip one out of an old dying piece of electronics. That should give quite a bit of current, but you would want some way to regulate it.

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