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Dividing circuits

Discussion in 'Electronic Basics' started by John Craig, Sep 9, 2005.

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  1. John Craig

    John Craig Guest

    I am building a free pendulum clock, and am hoping to get pulses at
    the rate of one per second from a photoelectric cell in the path of
    the pendulum.
    Where can I find a circuit which will count these, and give out a
    signal after 30 pulses?
    This would be used to drive the clock hands, and also power a magnet
    to keep the pendulum swinging.
    Thanks for any help,
    John
     
  2. This should do what you want:

    http://www.terrypin.dial.pipex.com/Images/Pendulum-Divide30.gif

    Choose mono RC values to suit your needs. Drive next stage via
    transistor or relay as appropriate. Supply can be 4 to 16 V.
     
  3. Jasen Betts

    Jasen Betts Guest

    there's a milion different ways to do that... a small microcontroller could
    be programmed to emit a pulse evert 30 clock cycles, or you could build a
    divider from discrete logic... (eg a couple of decadee counters in series
    the first wired as divide by 3 the second as divide by 10) or set up a 29.5
    second monostable triggered by the pendulum - every thirty seconds the
    pendulum will re-synchronise it.

    Bye.
    Jasen
     
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