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Car Adapter Voltages

Discussion in 'Electrical Engineering' started by Tama Harbor, Nov 16, 2003.

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  1. Tama Harbor

    Tama Harbor Guest

    I have a portable MP3 player with a 5.0 volt DC input battery charger.

    I have a car DC adaper, with 4.5 and 6.0 volt DC outputs (no 5.0

    Can I 'successfully' use the 4.5 or 6.0 volt car adapter to power the
    5.0 volt device?

    Thank you in advance.
  2. Guest

    Assuming the 4.5 and 6V adapters truly give you those
    voltages, and assuming they provide enough current for
    the MP3 player:
    You might get away with using the 4.5 volt adapter.
    The 6V adapter will work if you put a diode in series
    with it.

    However - you probably could make an adapter the you
    KNOW will work at very little cost. Post the current
    requirements for the MP3 and the current specs for
    the charger and we'll tell you how. My guess is that
    the MP3 has very low current requirements < 50 mA - in
    which case a cigarette lighter plug, some wire and a 7805
    is all you need.
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