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Thread: found a new dc to dc power supply for VIA EPIA owners

  1. #11
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    Quote Originally Posted by Rob Withey
    They do dc2dc - with a nice regulated 12v source.
    12 output is usually unregulated, so what goes in, comes out, straight into your mobo and drives.
    Although in theory you could just regulate the OUTPUT of the 12v rail using an LM7812, thus cleaning up that 12v nicely. I think the actual psu could cope with 14.4 input for the other voltages.
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  2. #12
    Maximum Bitrate gizmomkr's Avatar
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    I have a pw-70a / 120 (same thing, they just decided to rate it higher)

    So far, Im not too thrilled with it.
    Yes, it will work fine, yes it spits out +/- 3v , could damage something. yes you could easily regulate it, but - The first one I had died during testing... the replacement blew a fuse when I added my LCD (still well within the ratings for current draw)

    My pw70 is sitting in a box, and will continue to do so for the forseable future.

    I bought an opus
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  3. #13
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    gizmomkr
    u have a pm
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  4. #14
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    gizmomkr
    can you tell me what the third conector is for on the pw70 ?
    There's a connector to power a 3,5", the second one to power a 2,5" but the third one with 2 wires (red,black) ???

  5. #15
    FLAC guitar333's Avatar
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    wouldnt that either be the power input? If not then it must be a 5V/Ground
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  6. #16
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    yeah maybe...

  7. #17
    Maximum Bitrate gizmomkr's Avatar
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    Yeah ,its a 5v line.
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  8. #18
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    Quote Originally Posted by phil.45
    Although in theory you could just regulate the OUTPUT of the 12v rail using an LM7812, thus cleaning up that 12v nicely. I think the actual psu could cope with 14.4 input for the other voltages.
    In theory you can't do this. The LM7812 family needs a couple volt higher input to do any regulation at all. Even 14.4V isn't enough. Feeding it too low may cause the thing to oscillate, with all sorts of nasty side effects

  9. #19
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    Quote Originally Posted by scsirob
    In theory you can't do this. The LM7812 family needs a couple volt higher input to do any regulation at all. Even 14.4V isn't enough. Feeding it too low may cause the thing to oscillate, with all sorts of nasty side effects
    Er, Ok buddy. Perhaps you need to explain this to everyone on this board who has been using the LM7812 linear regs for years in their cars without any issues at all. For your reference in future, it needs 1 volt higher than the input, and at 11 volt input will continue to output 10volts quite happily, which incidently is more than enough for the 12v lines on most motherboards. Please, do some research before posting again.
    -------------------------------------------
    (=========-) 99% complete
    --------------------------------------------
    AMD K6/2 500 @ 450mhz to keep heat and power usage down, 64Mb, slim CDrom drive, 64mb USB pendrive for MP3 transfer, 10Gb 2.5" drive for MP3, USB>RS232
    All jammed in external CDROM drive case.
    Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
    ----------------------------------------------

  10. #20
    Raw Wave Rob Withey's Avatar
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    Yeah, I didn't understand the whole oscillation thing either. Was using a 7812 for ages with absolutely no problem. Have now switched to a TI ISR though.
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

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