![]() The coil kicks back the stored energy during the oscillations, magnifying the generated AC across it. The oscillations produced at the collector of the transistor is dumped into the coil, saturating the coil with magnetic inductions. The center tap from the piezo transducer plays an important role in sustaining the oscillations and therefore in this particular design we need a three terminal piezo rather than a two terminal one. The transistor reverts to its original state and the cycle repeats, generating oscillations or the required “buzzing” frequency. When a voltage is introduced in the circuit, the transistor conducts, operating the piezo element across the buzzer coil, however this also leads to the grounding of the base of the transistor through the center tap of the piezo element, this instantly switches off the transistor and in turn the piezo also switches off, releasing the base of the transistor. Referring to the above buzzer circuit diagram we find that the transistor T1 along with the inductor forms the heart of the circuit.īasically the coil which is specifically called the buzzer coil, is in fact positioned for amplifying the created oscillations while the actual feed back is provided by the center tap of the three terminal piezo element used for the present application. Instead of the normal working concept employed by other forms of oscillators which require resistor and capacitor networks for generating the oscillations, this circuit use inductive feedback for the required operations. The simple piezo buzzer circuit described here actually works in a quite unique way. ![]() Just a single transistor, a ferrite inductor, and a piezo transducer, that's all you will need to make this circuit “buzz” or rather “twit” for you, with an output that may be quite loud and ear piercing. A buzzer is a high frequency oscillator circuit used for generating a buzzing sound through a transducer or speaker output. ![]()
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