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Thread: pico 90w and non ATX SBC

  1. 01-10-2008, 08:39 PM #1
    yonu
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    pico 90w and non ATX SBC

    hey all I have a semi stupid question I am rebuilding my car system using a P3 SBC it uses a standard 4pin molex for power rather than an ATX upon turning on power the board turns on so I am having a bit of trouble figuring out how to send the system into hibernate or cleanly powering off if anyone can suggest a PSU or a method I would be very appreciative

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    Yonu
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  2. 01-10-2008, 09:00 PM #2
    galvitron
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    What MB and power supply? My MB has the same P4 connector and I have used the M2-ATX (not ideal). You will have two choices:

    - Use a ATX PSU made for the car and use its featues. This requires some tricky switching on the 20pin to make the PSU think the MB is connected to it.

    - Use a DC-DC regulator and put 12V into both 12V pins on the MB and GND into GND pins on MB (making 4 pin P4 connector). You will have to figure out hibernate issues based on MB and PSU
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  3. 01-10-2008, 09:16 PM #3
    yonu
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    actually it uses a 4pin moles like a harddisk or cd drive
    and it is a flexstar pegasus board
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  4. 01-11-2008, 12:02 AM #4
    galvitron
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    OK, then regulated 12v into a molex that fits the MB. I have been told that the Carnetix line has some good options. An ATX Car PSU will work with trickery.
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  5. 01-11-2008, 08:34 AM #5
    yonu
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    thanks i just looked at the Carnetix stuff that would be great except the the 5v rail is not strong enough the board requires 5A on the 5v rail and .25A on the 12v ail go figure I actually can't even find an atx one that will putout the 5v with a few spare amps for the 5v stuff any suggestions would be great

    oh and it is a Flexstar Pegasus board
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  6. 01-11-2008, 01:08 PM #6
    galvitron
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    Are you sure the board needs 5V? I would double check that...it's a P3 system right?
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  7. 01-11-2008, 01:39 PM #7
    yonu
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    It is in the manufacturer spec sheet 5A on 5v 0.25A on 12v
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  8. 01-11-2008, 02:04 PM #8
    galvitron
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    Weird input voltages...

    I don't know one off of the top of my head, but you should be able to find a PSU. You know what to look for it seems...make sure that the 5V rail can handle it.
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  9. 01-11-2008, 04:58 PM #9
    yonu
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    that is the problem I have I like the idea of the Carnetix however the 5v rail can't handle it the closest i can find only puts out 8A on 5v think that might be enough as long as there isn't much in the way of USB?
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  10. 01-11-2008, 05:51 PM #10
    galvitron
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    Are you also putting a graphics card or using onboard graphics?
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