The buzzers use the reverse piezoelectric effect to make a piezoelectric plate vibrate and generate sound. The mono-tone buzzer can be used straightforwardly.
Working principle
The piezoelectric effect refers to the process of producing an electric current when piezoelectric materials are deformed by external force. Conversely, an electric current going through piezoelectric materials causes the materials deformed, which is called reverse piezoelectric effect.
A buzzer consists of a piezoelectric ceramic disc and a metal plate. When an alternating current is applied to the piezoelectric disc, it alternately stretches and shrinks due to the reverse piezoelectric effect. The disc repeatedly bend in both directions like a vibration, generating sound waves
Mono-tone buzzer is an active buzzer that has a built-in oscillator converting constant direct current into alternating current. This allows the buzzer to continue sounding with only a DC voltage supply. when a DC voltage is applied to it. However, it also limits the produced sound to a particular frequency (pitch).
Specification
Rated Voltage: 5V
Rated Frequency: 3000Hz
Min Sound Output: 85 dB
Operating Temperature: -40~+85
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