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If Current = True Then Close This Circuit

Discussion in 'Electronic Components' started by [email protected], Nov 28, 2006.

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  1. Guest

    I am basically looking for a way to detect a small current that was
    intended to turn on a piezoelectric buzzer and if it senses a current
    there, to close a circuit on the same board.

    You matter how novel or noble my ideas are...they always
    sound like I'm trying to make a freaking bomb...
  2. PeteS

    PeteS Guest

    How small a current?

    Think sense resistor and amplifier.



  3. Or relay, or photocoupler. If you've got 3mA to work with, a photocoupler
    will probably do just fine. If you've got 50mA, an electromechanical relay
    will work.
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