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ACDC converter

Discussion in 'Electronic Basics' started by AnthonyO, Sep 18, 2003.

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  1. AnthonyO

    AnthonyO Guest

    Can anyone please help.

    Dismantled an old office PBX system the other day and came up with a
    couple of chunky AC mains converters to 12volt (exact specs say Input
    240v 0.8A 50hz Output 12V 3.4A / 12V 4.7A CT)

    I thought I'd use one to power a Car Tape/Radio for my sons' bedroom ( I
    have a number of older ones lying around) just for fun. He loves lying
    around listening to old Cliff Richard tapes - sigh, hope he grows out of

    But of course output is AC.

    How can I convert? And if I can - would that be a correct supply for a
    car radio/cassette?

    Answers in simple english please - or even a part number from Maplin ;-)

    Thanks a lot.

  2. CFoley1064

    CFoley1064 Guest

    I thought I'd use one to power a Car Tape/Radio for my sons' bedroom ( I
    It will be fairly difficult to get from your 240VAC to 12VAC transformer to the
    13.8VDC supply you will need for the car radio. You would need a bridge
    rectifier, a big capacitor, and some kind of regulator to keep the output DC
    voltage in the range you want. You would also need some kind of overcurrent
    protection to protect the transformer, and ditto for the radio. It might be
    easier to just buy a solution.

    In the Maplin A - Z listing for their website, look under Power Supplies (Radio
    Communication). There are a number of fixed-output 13.8VDC supplies available
    in a variety of current ranges. Pick one that will supply more current than
    your radio/amp needs, plug it in, and you're good to go. For a "standard" car
    radio, the Palstar PS-04 should be sufficient. It's good for 4 amps, and will
    reliably drive a car radio with small speakers. If you've got a heavy-duty amp
    and lotsawatts, try the Palstar PS-15. Both have foldback current protection
    (you won't be popping fuses all the time).

    Good luck.
  3. AnthonyO

    AnthonyO Guest

    (CFoley1064) wrote in
    Thanks a lot - you've been a great help.
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