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Help Please Electric Toothbrush

Discussion in 'Electronic Repair' started by Peter O, Aug 22, 2003.

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  1. Peter O

    Peter O Guest

    My rechrgeable "Braun" electric toothbrush has finally given up.
    It will not hold a sufficient charge to manage even a quick tooth clean.
    Bummer................ I had got used to the idea it would last forever.
    To be fair, for a price equivalent of US$15, it has been a spectacular
    demonstration of the best in modern technology, lasted about 3 or 4 years.

    So I thought ........... lets power this with a Wallwort & dispense with the
    Ni-Cd rechargeable.
    Well my 3.6vdc/0.15amp wallwort drives the motor (alone) but will not power
    up the brush when assembled.
    I have a 5vdc power unit with 10amp capacity & this really powers up the
    brush but I doubt the unit would last long at this voltage.

    My question: what would the Ni-Cd rechargeable be capable of delivering, I
    thought about 3vdc at maybe 0.25 amps but that's a straight guess.
    If I can find or buy a wallwort with about the same capacity I can get on
    with this little project.
    BTW the Ni-Cd battery is a Panasonic unit with no ID or volt marks, which
    looks as thought its really two units in series.

    I'd appreciate a little help from those of you who "know things".
    Thanks

    Pete
     
  2. NiCds can easily supply AMPs so you'll really have to measure the
    current drawn by the motor at about 2.4 V. Put enough high power low
    ohms resistors or diodes in series with the 5 V to get 2.4 V and measure
    the current under load.

    You could also replace the dead cells.

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  3. Jerry G.

    Jerry G. Guest

    They way it is designed, you need to replace the battery (cells). It
    will probably be cheaper to replace the unit. This is a very low cost
    device.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    ==============================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    Instruments http://www.zoom-one.com/glgtech.htm
    ==============================================
    My rechrgeable "Braun" electric toothbrush has finally given up.
    It will not hold a sufficient charge to manage even a quick tooth clean.
    Bummer................ I had got used to the idea it would last forever.
    To be fair, for a price equivalent of US$15, it has been a spectacular
    demonstration of the best in modern technology, lasted about 3 or 4
    years.

    So I thought ........... lets power this with a Wallwort & dispense with
    the
    Ni-Cd rechargeable.
    Well my 3.6vdc/0.15amp wallwort drives the motor (alone) but will not
    power
    up the brush when assembled.
    I have a 5vdc power unit with 10amp capacity & this really powers up the
    brush but I doubt the unit would last long at this voltage.

    My question: what would the Ni-Cd rechargeable be capable of delivering,
    I
    thought about 3vdc at maybe 0.25 amps but that's a straight guess.
    If I can find or buy a wallwort with about the same capacity I can get
    on
    with this little project.
    BTW the Ni-Cd battery is a Panasonic unit with no ID or volt marks,
    which
    looks as thought its really two units in series.

    I'd appreciate a little help from those of you who "know things".
    Thanks

    Pete
     
  4. Jim Adney

    Jim Adney Guest

    Why not just replace the dead cells. Even if they are soldered in they
    are rather easy to replace. There are small appliance repair shops in
    most cities who can do this, and even some battery shops can, too.

    -
     
  5. Dave D

    Dave D Guest

    Time to buy a new one. Replacing cells in items as cheap as these is pretty
    pointless, especially as there is likely considerable wear on the mechanical
    parts by now. If you were to get it re-celled professionally, it would cost
    you more in parts and labour than a new one.

    Dave
     
  6. kc8adu

    kc8adu Guest

    find out what type cells they are and replace them.
    easy job.
    many online sellers of cells cheap.
    www.batterystation.com
    is a honest and reliable source.
    they are likely nicads or nimh.
     
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