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Thread: Two power supplies

  1. #1
    Join Date
    Jan 2007

    Two power supplies

    I've tested the power draw on my pc (M1-ATX, M10000) and when its running on its own its pulling about 3.2A onto the M1.

    When I put it into standby, its pulling about 0.18A onto the M1, and when I pull all the external USB devices, this drops down to 0.1A in standby.

    Now, 0.1A isn't a heck of a lot and with a 90AH battery in a car that gets used every day (longest period unused is 40 hours at the weekend - it "should" last 900 hours at 0.1A), I reckon I can put it into stanby and not have any real battery issues. This wouldgive me very rapid start times, without the hibernation issues (current best return from hibernation is a paltry 40s). For holiday periods I can always hibernate it/turn it off.

    Installing this in my car is not an issue per se, but running power to all of the peripherals - touchscreen, USB hub, external audio card, USB TV, bluetooth , external HD (NEO jukebox with all my MP3s on) from the existing M1 will overpower it.

    I want to have stabilised voltages to all the bits, so I'm considering getting EITHER

    an M2-ATX to replace the existing M1 and then tapping all the power supplies into the PC, but this would increase the standby current draw to 2 or 3x what it could be.


    Using an "external" M2 to drive all the peripherals is a neat solution as far as I can see, as I can set a "power off" delay and it'll give me enough amps at +12v to drive the screen,the NEO jukebox HD and possibly the radio tuner as well

    The neatest thing I thought of though is being able to cut the power supply to the external USB devices, which, although some of them have their own external +5V supply, they do draw power down the USB cables when the PC is in standby. So, by tapping into the USB +5V lead from the PC to the USB hub and using a relay to disconnect that when the IGN is off, I should be able to get back to the 0.1A current that the M10000 needs in standby.

    Are there any reasons why this wouldn't work?



  2. #2
    FLAC strohj's Avatar
    Join Date
    Aug 2004
    sounds like it should work.. and if it doesnt its easy enough to reverse your changes...

    I say go for it
    Pentium 4m 1.5GHz|MB896|Roadie Extreme|XM-Direct|Rikaline 6010|T-View 7"|Streetdeck|160gb Western Digital|1Gb DDR2-533 Ram

  3. #3
    MySQL Error MatrixPC's Avatar
    Join Date
    Sep 2003
    Beach City, Socal
    Just order a 5V POL from the store to power your usb devices by the POL instead of buying a complete PSU.
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
    89 Supra Turbo P3 600E@750/Abit BE6 II, Alpine M-BUS Car2PC.
    Y2K Accord Dell GX150
    RoadRunner is the best FE PERIOD
    EmoRebellion is a SCAMMER

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