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Thread: two m2-atx

  1. #11
    Low Bitrate PSYKO_Inc's Avatar
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    it'd probably be best to use one M2 for the motherboard, and use the +12V rail to trigger a relay to turn on the second M2 (in dumb mode) which would power the HDD, monitor, USB hubs, etc. Hopefully there wouldn't be enough of a delay from when the second M2 receives power till the HDD starts spinning to cause problems with bootup.
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  2. #12
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    So no one has been successful in implementing this?

    Has anyone been successful in implementing any of the DC-DC PSUs with turn on and what not in the car environment?
    Jan Bennett
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  3. #13
    Low Bitrate JPMG's Avatar
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    I should work ... (maybe) ... you might as well try it.
    The M1 specs say that the PSU comes up, then waits a second until it activates the boot switch. So may 6 seconds from when you turn on until boot starts. So with a small relay you could activate the second one in dumb mode. Nothing more complicated than in the old days when ther were external cases for hard disks and SCSI drives.

    But ... watch the power lines between the two. That is, treat everthing on the second PSU as "external devices". Best bet would be to power the monitor and external USB hub and disks. All that would connect the two would be the signal cables.

    And ... watch ground line issues. It may not be a problem but to be safe make sure both PSUs are close and you ground both to the same spot (preferrably clode to the PSU).

    Let me know how it works .... I had planned to do something similar for a truck install and want to see how yours works out.

    Cheers!
    ... Mike ...

  4. #14
    Low Bitrate rjankowski's Avatar
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    i would think that it would work fine, just so long as the M2 powersupplies are isolated (meaning there is some break in physical connection such as a transformer or inductor) otherwise, i would just see it pulling from the PS with the least resistance to it.
    but im no expert, didnt spend enough time in electronics in college (altho i wanted to)
    im intrested to see if it does work too, not for any particular reason, just sounds cool

  5. #15
    FLAC W3bMa5t3r's Avatar
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    Ok guys... you all were trying to think too hard about it. No need to splice all the wires together. I drew up this diagram which will allow you to hook up 2 M2-ATX power supplies together. Wire the first one up as illustrated below, set to MODE 0 - ATX Dumb Mode. The +12vdc splice is from the first power supply off a yellow (+12) line. There will be next to nothing for power draw, since a normal relay doesn't pull much current, so it's not going to hurt your supplies. The second one which powers your motherboard should be strapped (with the jumpers - see the M2-ATX manual -here-) to whatever MODE you are using for your startup/shutdown mode. I use MODE 1. Hope this helps

    /EDIT: Removed misleading diagram so there is no confusion.

    NOTE: IF YOU'D LIKE A LARGER VIEW OF THIS DIAGRAM, CLICK -[ HERE ]-

  6. #16
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    slight technicality

    ok that diagram is sweet but wouldnt when you turn off the car it would shutdown the first power supply which would cut power to your h/d b4 the m/b on the second supply had shutdown, suppose if you had the h/d connected to the second power supply itd probably be ok, correct me if im wrong.

    p.s. id h8 2 look stupid concidering this is my first post on this forum please go easy on me

  7. #17
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by hitekdigital View Post
    ok that diagram is sweet but wouldnt when you turn off the car it would shutdown the first power supply which would cut power to your h/d b4 the m/b on the second supply had shutdown, suppose if you had the h/d connected to the second power supply itd probably be ok, correct me if im wrong.

    p.s. id h8 2 look stupid concidering this is my first post on this forum please go easy on me
    Actually, you're right. But what I also meant to tell w3b, was that both the M2's should be in the same mode or with the first one in a greater mode. SO basically the second one with the mobo, will send the by by signal (on/off) switch which....

    new train of thought....

    Just connect the 2 on/off pulses! Then the accessory M2 will send an on/off pulse to the first which will send an on/off pulse to the motherboard and both will start shutting down. The accessory one should still be on for "longer". For instance, if the mobo is on 5s/45s, then the acc one should be on 30s/xxx just to be sure. And the ign sensor for the mobo m2 should be the 12v+ yellow from the first.
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  8. #18
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    Next attempt

    ok heres our next attempt thanks to all the posters





    im not certain but u may have to connect both on/off switches, if the accessories power supply dont fire up u may have to simply place a connection between both "Optional On/Off switches" but what ever you do dont jump in and do this without a few of the other guys here saying it is ok cause i dont want to be the one that fries your h/w

  9. #19
    FLAC W3bMa5t3r's Avatar
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    Hey guys.. lol sorry just made it back. Been a crazy day. Yeah I thought something wasn't looking quite right when I posted the last update, but it looks like you all figured it out Looks good and even simpler than my design. Good stuff

  10. #20
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    Question, will the motherboard see 150w or 300w? I tried powering my motherboard with a 200w PSU at home and the bios displayed low power warning.

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