Whats the third wire on a piezo buzzer


Posted on Feb 5, 2014

The piezo effect works both ways: if you apply a voltage the piezo stretches, but also if it stretches it creates a voltage. This principle is used to create a feedback signal which drives the oscillator. The advantage of the self drive is that it will automagically work at its resonance frequency, where it produces the loudest sound. In 2-wire circuits the oscillator`s frequency is


Whats the third wire on a piezo buzzer
Click here to download the full size of the above Circuit.

independent of the piezo`s resonance frequency, and it`s the designer who has to make that they`re close.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Fan Failure Detector circuit
    6V to 220V inverter schematic Schematic Diagram
    tv transmitter circuit
    phone hold circuit
    Thermocouple amplifier gain circuit
    SR63 holiday lights ASIC
    12kHz IF oscillator circuit diagram



    Top