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battery chargers fried ...

Discussion in 'Electronic Repair' started by RS, Apr 7, 2005.

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  1. RS

    RS Guest

    Preamble:

    ************************************

    While travelling and visiting friends in rural India recently, I was using
    NiMH "AA" cells, and Rayovac rechargeable alkaline "AA" cells to power my
    digital camera.

    To recharge them I was using a "GP" brand (model GPKB34P) charger , and
    a Rayovac Model PS1 charger. Both are 117v 60Hz devices, and I was running
    them through a 220 > 110 volt transformer.

    Power outages were common in the area and sometimes a farm tractor with a
    jury-rigged generator running off the "power take off" shaft, was used to
    supply electricity to the farm house. During one evening when I was away
    visiting other relatives of theirs, it seems there was a "brown-out" sort of
    situation due to the tractor running at an unusually slow speed for several
    hours. I saw the flickering honey-color tungsten lamps in the house when I
    returned and realized that my chargers were not getting proper voltage !

    The chargers both appear to be dead. The transformer survived, according to
    subsequent tests with a volt meter.

    ***********************************

    Question: Are either of these 2 chargers likely to be easily repairable?

    Thanks !

    -RS-
     
  2. sofie

    sofie Guest

    If the transformers are indeed good (proper AC voltage at the secondary)
    then there ain't much more to the charger than at most a secondary fuse, a
    diode or two, resistors or possible a regulator semiconductor. Get your
    multi-meter back out of the tool box and perform some simple testing of
    components.
     
  3. jakdedert

    jakdedert Guest

    Huh uh, Dan. He was referring to the 220-110v stepdown transformers he had
    in series with the chargers. Those survived. The chargers are Li-ion, so
    there's gonna be some active electronics in there...perhaps as little as a
    timer circuit; but AIRC, these things go for as cheap as $10, so there's
    little hope or profit in trying to fix them anyway.

    jak
     
  4. NSM

    NSM Guest

    It wasn't low voltage that fried them. It was low frequency. 50 cycle would
    have done it if the voltage wasn't reduced from 120 to 100. The internal 110
    to (12?) transformers are probably dead.

    Can you fix them? Yes, if you can get the parts.
     
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