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Transistor being affected by nearby oscillator

Discussion in 'General Electronics' started by, Nov 11, 2003.

  1. I have a piezo buzzer that is controlled via a pic microcontroller, through
    a transistor. Problem is, when I designed a newer circuit to make the
    beeper louder, I now have the buzzer making a quiet tone all the time when
    the transistor should be 'off.' The newer circuit replaces a straight up
    +VDC to the positive terminal of the buzzer, with a voltage doubling IC from
    fairchild. Everything seems like it would work if the transistor were a
    physical switch, but I don't understand enough about them to know what is
    going wrong. Could I simply replace the transistor with a solid state
    relay, or am I missing something here? Thanks,

    -- Jeff

    Pic --> Transistor -->Gnd
    ______^ ^
    | |
    Buzzer <-- Voltage doubler circuit <-- VDC+


  2. Hello Jeff,
    try using the IC CD4066. It will solve ur problem.

    Mukesh tatiya
  3. Robert Baer

    Robert Baer Guest

    The "voltage doubler" is doing the deed; first check bypassing against
    what the data sheet recommends.
    Also re-check on how you have the beastie connected.
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