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Ultrasonic piezo buzzer

Discussion in 'Electronic Design' started by prizark, Aug 15, 2003.

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  1. prizark

    prizark Guest

    Hi guys

    I wanted to produce ultrasonic frequency sounds so I started off
    generating a square pulse at 40Kz from a 8051 and connected a normal
    piezo buzzer,rated at 112dB. All I could here is a continous annoying
    loud sound rom the buzzer but are the sounds really at ultrasonic
    frequencies.HOw else can I make a ultrasonic sound generator without
    buying some expensive ultrasonic transducers.Did anyone else did
    something else like this.

  2. Leon Heller

    Leon Heller Guest

    I doubt if you are getting much ultrasonic energy out of it.

    40 kHz piezo ultrasonic receiver/transmitter pairs are quite cheap. Buy a
    pair and you can use the receiver to test the transmitter. You could just
    put a sensitive scope across it - I tried this once. It would be interesting
    to see how much 40 kHz you are getting out of the original transducer.

    If you have access to one a cat makes a good ultrasonic tester; they can
    hear over 40 kHz. He/she will come over and investigate it if it is working.
    I tried this with a previous cat I owned.

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