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Can a regular AC-DC wall adapter be replaced with a more efficient power supply?

Discussion in 'Electronic Basics' started by SA Development, Nov 9, 2005.

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  1. Hi,

    I have 3 or 4 devices in my wiring closet that all use 12V. Some of the
    power adapters are rated for more and some less, lets say for example 200ma,
    500ma, 800ma.

    My first question is, can I buy a larger 12V power supply (regulated) and
    wire them all in parallel if I add up the sizes (1.5a in my above example)?

    My second question is, would a switching power supply produce less heat and
    work with devices that are typically powered by a wall brick?

    Thanks for the help!

  2. Rich Grise

    Rich Grise Guest

    Yes. I'd recommend that you run each thing's 12V cable back to a terminal
    block at the PS, so they aren't sharing each other's power wires.
    Yes, if the output is quiet enough. (and has the current capability).

    Have Fun!
  3. Bob Eldred

    Bob Eldred Guest

    Yes it's possible but your savings will only be a couple of watts, if that,
    and you'll spend $bucks to do it. There are many better ways to conserve
    electricity like getting rid of incandescent lamps.
  4. Pooh Bear

    Pooh Bear Guest

    There may be issues with common ground connections.

  5. Using bus bars and wiring from same in parallel, as opposed to running
    a daisy chain, should alleviate those issues.
  6. Dan Hollands

    Dan Hollands Guest

  7. Bob Masta

    Bob Masta Guest

    I think what Pooh Bear was referring to is the
    connections to the outside world. In the normal
    situation with the wall-wart, the device is isolated... the maker
    can choose to tie +12 to the ground of an output connector,
    for example. If another device ties the supply ground to the
    output ground (a more normal situation) then there will be
    smoke if you interconnect these.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    Home of DaqGen, the FREEWARE signal generator
  8. Pooh Bear

    Pooh Bear Guest

    You're correct. There is no way to tell the internal wiring of the unit.

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