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Power Amplified Speakers from PC Power Supply

Discussion in 'Electronic Basics' started by CW, Aug 29, 2004.

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  1. CW

    CW Guest

    Greetings! I'd like to power my external PC speakers with my computer
    instead of using the bulky AC wall transformer/adapter that they were
    shipped with. The wall adapter is rated for +9VDC @ 1A. When I measured the
    output with a DMM, I get +12.5 Volts, so I presume the voltage goes way down
    once it is loaded. So, what I'd like to do is drill out a card slot blank,
    put in a cheap coaxial plug and wire that to one of the +12VDC PS connectors
    in my PC. What I don't know is whether or not my amplified speakers can take
    the somewhat regulated +12VDC. I really don't want to put a 3 Ohm, 3 Watt
    resistor in series with the speakers, and would prefer not to have to build
    up a DC to DC regulator circuit (i.e. LM317T). What I guess I'm looking for
    is whether or not someone has already done this, and what the results were.
  2. JeB

    JeB Guest

    Try measuring the wall wart with the amplifer on. If it's still close to
    12v then you might get away with it.

    I'd use the regulator myself.
  3. Why not use a 7809 reg ??
    You could just about hang it off the socket terminals, I would use a DC
    power socket and plug to avoid any confusion too :)
  4. CW

    CW Guest

    I've got a cigarette lighter adapter for an obsolete Escort radar detector
    that has the 12vdc to 9vdc converter built in to a housed module--has the dc
    power jack built-in also. It might look kinda funny, but I might just drill
    a hole in the back of the case and add a cigarette lighter socket. I think
    the old radar detectors had to use 9vdc because of the Gunn Diodes. Does
    anyone know if newer radar detectors use the 12 to 9 vdc converters? Or are
    they simply powered from 12 vdc now-a-days? This would be good to know in
    case I decide to modify any other cases. Thanks!
  5. Active8

    Active8 Guest

    My very antiquated radar detector ran off 12V. Note to self: get a
    more modern one.
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