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Can I substitute a 6v for a 4.5v power supply?

Discussion in 'Misc Electronics' started by Gary, Nov 12, 2003.

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  1. Gary

    Gary Guest

    I just bought a portable CD player whose specs call for a 4.5V/300mA power
    adapter. The player doesn't come with an adapter, just two AA batteries. I
    found a couple of adapters in my house that are 6V/300mA. Can I (safely) use
    these adapters in place of the 4.5V the specs call for?

  2. No, this would probably damage your CD player. However, if you splice a
    a resistor into the low voltage line, 5 ohm half watt, you have made
    yourself an unregulated 4.5 volt/300 mA adapter.

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  3. Gary,

    Something does not fit. Two AA batteries account for 3V max. Most of the
    time it will be less. For 4.5V you would need three batteries. So if your
    battery box only has place for two batteries - and the CD player works fine
    with it - 6V will be a substantial overkill. It may even worse when the
    converter is unregulated. If you have a regulated 6V converter you can
    nevertheless use it but you have to use three diodes - let's say 1N400x - in
    series. If you have an unregulated supply, you have to add a regulator
    circuit. A new converter will be much easier and even cheaper.

  4. jriegle

    jriegle Guest

    It does seem strange, but my CD player uses 2 AAs and it is marked 4.5 volts
    on the DC input and, in fact, came with a 4.5v wall wart. My digital camera
    uses a 3.7 Li-ion battery and comes with a 5v AC adapter.

    These devices have an internal power supply that converts to several
    voltages as a computer's PSU for the various electronics inside. While the
    OP's CD player may work with the 6volt adapter, the dissipation may be
    excessive and damage the player.
  6. Mjolinor

    Mjolinor Guest

    Which is why he posted in the first place.
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