What is piezzo buzzer?

Piezo buzzer is an electronic device used to produce sound or audible signals in electronic circuits. The device is based on the piezoelectric effect, which causes an electric voltage to be generated when a certain type of crystal is mechanically deformed. In a piezo buzzer, a piezoelectric crystal is driven by an electronic oscillator, which generates an AC voltage at a specific frequency that causes the crystal to vibrate. This vibration produces sound waves that are radiated through a diaphragm or resonant cavity to create an audible sound. Piezo buzzers are commonly used in electronic devices such as alarms, timers, appliances, and toys due to their high reliability, low cost, and simple construction. They are also preferred over magnetic buzzers because they consume less power, are less sensitive to electromagnetic interference and can produce a wider range of sounds.