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12 volt to 12 volt regulated Power Supply

Discussion in 'Hobby Electronics' started by David, Oct 21, 2003.

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  1. David

    David Guest


    I am new to this newsgroup, so please bear with me.

    I am trying to get a design for a 12 volt DC to 12 volt DC regulated power
    supply. The design is to provide 12 volts DC + or - 5% output from an input
    of between 8 volts and 16 volts DC.
    The purpose of this is to run a computer in a sail boat. The battery voltage
    in the boat may vary from 8 volts to 16 volts when it is charging.

    I currently have an ATX computer power supply that runs off 12 volts DC, it
    provides 3 and 5 volts nicely, but the 12 volt rail is actually the input
    voltage. So, when the input is 12 volts all is well, if it goes high, well
    that could be a real problem, and if it goes low, the computer will shut
    down. If you can help it would be much appreciated.
  2. KoRRupT

    KoRRupT Guest

    Probably don't need to design a 12V-12V dc/dc converter as there are plenty
    of dc/dc converters around. One place to start looking is
    They are a bit pricey, but definitely top quality stuff.

    I'm not sure what the power requirements for the 12V rail would be in an ATX
    PC... but one model I've used in the past was the FDC60 series from Amtex.
    9-18V input, 12V/5A +/-1% output (FDC60 - 12S12). Very pricey for small qty,
    but definitely sweet.
  3. David Tuff

    David Tuff Guest

    Thanks for that, I will give them a call and see what the price is...

  4. Derek Weston

    Derek Weston Guest

    Have a look at the Mk 2.5 at

    Its not exactly what you want, but perhaps it can be a source of ideas
    for you.
  5. Rod Speed

    Rod Speed Guest

    You're generally better to cut to the
    chase and use a laptop in that situation.
  6. David

    David Guest

    Been there, I still use the laptop as a backup. So far, the commercial unit
    available from AMTEX looks good, but I still would like a design I can build

  7. Mike Warren

    Mike Warren Guest

    If you are after a complete 12V ATX supply design I can probably help.

    I designed one about 12 months ago. PCB is about 5 x 6 inches.

  8. David

    David Guest


    That would be great. How can I get to look at the design?

  9. Mike Warren

    Mike Warren Guest

    Replied by email.

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