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Q: feed wall wart device from OPUS

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  • Q: feed wall wart device from OPUS

    Say, I have a device powered by wall wart (12VDC) at home and I want to power it from OPUS or similar PSU in a car, and this device draws more than OPUS has on -12 rail. How do I feed it using +12 only? TIA!
    Asus K8S-MX ~ Athlon 64 2800+ ~ Kingmax MPXD42D-2K 1Gb ~ Seagate ST960822A 60Gb ~ PSK-3100 PS/2 kbd ~ MR-350 GPS ~ Hawking HSB1AP ~ Buffalo WLI-USB-G54 ~ 8" Dynamix TS LCD ~ DSATX ~ XCard ~ TVedia ~ some LCD TV ~ Vista ~ MapPoint 2006 ~ iGuidance 2.*

  • #2
    come again? why do you need -12V? 'Cause the +12V should be the one used for the 12V... usually. Unless you have some amazing unusual device.
    I have found you an argument; I am not obliged to find you an understanding.

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    • #3
      Well in any case, for external device that would only be fed from Opus GND and -12V outlet GND would actually appear as +12V to device and -12V as GND. This is of course only valid assuming Opus and that "misterious device" do not share same physical ground connection (which I assume thgey do not).
      In fact, saying your external device requires (only) GND and -12V volts is nonsence.
      So... does it require symetrical power instead (+12V, GND, -12V)?

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      • #4
        Oops, silly me, I assumed it requires symmetrical power, while it most probably doesn't. The "mysterious device" is a home-type LCD which I wanted to use before (or instead of, if money runs tight) picking up a touch screen. Thanks, guys!
        Asus K8S-MX ~ Athlon 64 2800+ ~ Kingmax MPXD42D-2K 1Gb ~ Seagate ST960822A 60Gb ~ PSK-3100 PS/2 kbd ~ MR-350 GPS ~ Hawking HSB1AP ~ Buffalo WLI-USB-G54 ~ 8" Dynamix TS LCD ~ DSATX ~ XCard ~ TVedia ~ some LCD TV ~ Vista ~ MapPoint 2006 ~ iGuidance 2.*

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