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Thread: Powering it all

  1. #1
    Variable Bitrate
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    Question Powering it all

    I'm trying to figure out which power supply I should get to power everything:

    Mini Touch LCD display (from MoCoSo - 10W, 12V)
    Nettop - (30w-40w, includes internal power supply, needs only 12V)
    AMP9 Amplifier (4x50W, 12V)
    Directed HD radio (12V, not sure about power draw)

    So I'm pretty sure the Amp and the radio can be powered straight from the battery and won't need to be powered directly from the power supply (please tell me if I'm wrong)

    The thing is, it really doesn't look like I need a 20pin ATX connector at all. I just need 12V regulated for the monitor and the nettop. Can I still use the M3 power supply for this? I just won't plug in the 20PIN connector and use the molex splitters to power those 2 components. My only concern is that M3 power supply isn't made to work without being plugged into the motherboard.

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Have you looked in the FAQ yet?
    How about the Wiki?



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  3. #3
    Variable Bitrate
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    Thanks for the reply, however it doesn't answer my main question - will M3 car PSU work without being plugged into the motherboard (the main 20pin plug will not be plugged in anywhere). I'm only interested in the 12V power coming from the molex/sata plugs - I'm planning to use them for the nettop's 12V input line and the monitor. Is this a good idea?

  4. #4
    Neither darque nor pervert DarquePervert's Avatar
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    Can it be done? Yes, but it's a kluuge job.
    I wouldn't consider it a good idea.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  5. #5
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    What would you suggest otherwise? I've looked at DC-DC converters (cuz that's all I really need) and they are bigger than M3, slightly more expensive and less functional. I'm not sure why you think it's a hack to power 12V parts with 12V of power coming from a power supply Am I missing something big? M3 is rated to provide 72W on the 12V rail. That should mean that I would get those 72W from that Molex connector, right?

  6. #6
    Variable Bitrate Wayne613's Avatar
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    Quote Originally Posted by nivanov View Post
    What would you suggest otherwise? I've looked at DC-DC converters (cuz that's all I really need) and they are bigger than M3, slightly more expensive and less functional. I'm not sure why you think it's a hack to power 12V parts with 12V of power coming from a power supply Am I missing something big? M3 is rated to provide 72W on the 12V rail. That should mean that I would get those 72W from that Molex connector, right?
    I think he means due to it not being actually plugged in. This is ACPI, so you´d need to fool it into thinking it was actually plugged in, in which case you´d have to tap/splice/mangle the molex from the PSU (think the m3 is a single molex unit isn´t it?), then wire up another switch I think, unless you want it thinking the ¨motherboard¨ is still running all the time, and having the hard-off setting being the default off for the PSU.

    If you just need regulated 12v others are a better overall fit I think, not one specificially made to interface with a standardized motherboard to more or less control it´s functioning. Carnetix as an offhand example.
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  7. #7
    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by nivanov View Post
    What would you suggest otherwise?
    I linked you to that FAQ so you could answer that question yourself.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  8. #8
    Maximum Bitrate boelle's Avatar
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    on the 20 pin plug you need to short the pins that would be the green wire and the black one next to it....

    on a normal psu this would cause the psu to power up... so you have to compare with a normal psu

    i hope this works on the m3 also... if so then you can just solder on a switch at the board so you can use the ****ch to make the short...
    Blessed are the "cracked" for it is they who let in the light.

  9. #9
    Maximum Bitrate boelle's Avatar
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    hmm... a switch is not even needed... if i'm correct you want 12V but still want to have the power up and down function... so i would just leave the short on the 20 pin plug and let the psu power off based on acc input....

    i have powered amps off the 12V rail on bigger psu's this way.. no problem in that.. just make sure the 12V rail can feed what you attach to it..
    Blessed are the "cracked" for it is they who let in the light.

  10. #10
    Maximum Bitrate boelle's Avatar
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    Blessed are the "cracked" for it is they who let in the light.

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