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Thread: M4-ATX 250 as a regulated PWR supply for various 12v and 5v devices in my truck

  1. #1
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    M4-ATX 250 as a regulated PWR supply for various 12v and 5v devices in my truck

    Hello, it's been years since I looked at the M4's I bought, and now I want to use one to provide a regulated 12v and 5v rail for a lot of various equipment.

    I have a relay already wired to the 12v cig that is switched by the key, so this will hard UP and DOWN anything I want to switch when starting and running my truck.

    The plan is to just wire the M4 12v input through that relay contact and let the PSU do it's thing. Turn the key off and BAM all pwr is cut to the M4 and all those devices.

    The next consideration is to snag a 12v rail, maybe the "(B) 12V-ATX power output connector 4 pin". Then find the 5v.

    I saw a post here from back in 2008 where it was advised to use the AWOK? to make the PSU come on, can someone please be gracious enough to tell me which pin and color I need to snag?

    On a regular psu I would grab the purple, I haven't identified this on the M4.

    So on the face of it, with the supply to this both switched and fused, and the fan connected, and this going ON and OFF via a relay, is there anything else you can think of in using this as a regulated PSU for many low current devices?


    Thanks in advance for your time and efforts!



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  2. #2
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    Check out one of the "use a PC power supply as a lab power supply" there is much good information there...

    Just do a google search. Since the M4-ATX is essentially a PC power supply designed to run off automotive 12volts you should be able to follow most of the information given.

    Also note that people have had issues with noise with the M4-ATX power supply. You MAY be better off with a different power supply designed to just output a set voltage. But I would check out the links telling you how to make a PC supply into a lab supply and you should be set.

    Rodney

  3. #3
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    Thanks for the quick reply.

    I have some high efficiency DC-DC converters and I could use them for the 12v and 5v, but this is rated for Amps and would kill more birds with less stones. A couple of DC-DC converters switched off the relay and spread around inside my jeep might do the trick nicely, they're not expensive and not noisy in any respect. I think it's more difficult to find DC-DC converters that run off 13.5 - 14.5 down to 12v than it is for the Tobsun 5v ones.

    Cam someone still tell me which wire is the start up switch for this? I do still have some mini PCs that require a 12v with 3.5mm input, so this PSU might still do for those. THX

    Pin 16 - which goes to the green wire in the harness?

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    Last edited by Anonymous1; Yesterday at 11:18 AM.

  4. #4
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    Quote Originally Posted by kibble View Post
    The purple wire should have 5V for the standby power. The green is the one that gets grounded on the mobo end so that the power supply will turn on. Check it and see if you are getting 5V on the purple wire.
    I think I found the answer.



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  5. #5
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    As it turns out, I only have a slow blinking green LED status and no output with the pins set to OFF and the proper pwr connection.

    So no worky. Wasted $.

    I'm hard pressed to buy a couple of M2's to replace this at the current prices.

    I need a basic 12v regulated board, not for a PC. Any suggestions?

    Variable 12 - 14v in, and smooth 12v out, 10A should be sufficient.







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    Last edited by Anonymous1; Today at 01:16 AM.

  6. #6
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    I ended up just ordering 3 supplies for my truck needs.

    Qty =1 of the MEAN WELL DC/DC Power Supply Single Output 5 Volt 10A 50W 5-Pin

    Qty = 2 of the MEAN WELL DC/DC Power Supply Single Output 12 Volt 4.2A 50.4W 5-Pin

    Jameco has the lowest price and these MEAN WELL PSU have a 2 year warranty. I spoke with MEAN WELL at length and studied the specs etc. I might put some 120mm fans on them, but not required.

    So for under $100 I have 12v@9A and 5v@10A regulated filtered PSUs with variable input 9.2 to 18.

    Cheers



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