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How to determine supply voltage?

Discussion in 'Electronic Components' started by Impmon, May 1, 2007.

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  1. Impmon

    Impmon Guest

    I have an inverter board with a hard wired 50mm x 3mm CCFL. Picture is
    at: 133k, 640x480)
    and larger version at (600k, 56k warning)

    and schematic I drew based on it: (transformer coil
    diagram unknown but it's drawn by the pin number)

    Transformer has no marking other than high voltage. I am not able to
    figure out the wiring diagram of the transformer without de-soldering
    and removing it. 2 transistors are D1616, resistors are aprox 1/16w
    SMD. Inductor has no marking either but it appears to have iron core.
    Capacitor on the primary side has marking 1J100, and one on secondary
    side has marking 22 and 3KV

    Any idea what is the supply voltage? I think the typical inverter
    voltage of 12v is too much as the board looks like it may be from a
    small flash light type device.

  2. Baz

    Baz Guest


    I'd start off with say one cell, or 1.5volts and work my way up until the
    lamp is stable and then make sure nothing gets too hot. Then the choice is
    up to you.

  3. Impmon

    Impmon Guest

    My meter only goes to 3kv AC and it was off the scale by the time I
    got to 4v DC. But I got a nice steady light at 5v to 6v so I guess it
    was designed for 4 cell flashlight. After I let it run for about 10
    minutes, it was shut off nothing felt warm.
  4. Baz

    Baz Guest


    Nothing like a careful bit of testing to come up with an acceptable answer.
    If you're happy with the light output, I think you've solved your problem.

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