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    Hello,
    I was wondering if anyone had used the circuit diagram in the documentation to drive a speaker? If so what npn transistors did you use? Does anyone have other circuits for plugging the device into an external amplifier?
    Many thanks
    Martin

  • #2


    I would suggest a BC639 for the transistor.

    To connect to an external amp, try a 47k in series with 1uf cap off the positive speaker terminal.
    Depending on the sensitivity of the amp, you may need to adjust the 47k resistor.
    Regards,
    Dave

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