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    Ultrasonic transducer alternative

    can you please help me find an alternative transducer for MA40L1S?? its an ultrasonic transducer (above 20kHz). Can a tweeter be an alternative? thanks in advance:)
  2. N

    Mosquito Repeller

    does this circuit work? i tried a circuit like this before and does not have any effect on any mosqito. BTW 15kHZ is still audible by humans.