![]() Piezo disc sensors in microphones detect sound waves. Piezoelectric disc buzzers are extremely useful elements for generating sound. The vibration creates sounds of all tones, pitches, and volumes found in clock alarms, smoke alarms, doorbells, telephones and much more. When an AC voltage is applied to the two electrical contacts on the face of the piezo disc, the piezoceramic vibrates at the applied frequency to produce the desired sound. Piezo disc actuators bend back and forth very rapidly when an electrical signal is applied, oscillating and vibrating. Let’s first explore piezo disc buzzers as piezo actuators in sound production. The beauty of piezoceramics is they can perform as a piezoelectric actuator and produce sound, or as a piezoelectric ceramic sensor and detect sound. We will explore the detailed mechanics of piezo buzzers and piezo discs in sound production and detection below. Piezoelectric discs capture sound waves and convert them into an electrical signal, such as in contact microphones. A piezo disc alone has the opposite effect of a piezo buzzer. Piezoceramics that produce sound are usually known as piezo buzzers, which consist of a piezoelectric disc attached to a housing driving circuit. The sound generated will have different pitches and sounds at different frequencies. Depending on the frequency of the voltage, the oscillation of the piezoceramic produces an audible sound. ![]() ![]() When a voltage is applied to a piezo disc, the piezo disc oscillates. Piezoelectric discs are most used in this application. Piezoelectric ceramics have long been used in microphones and sound production as a compact, yet effective means of capturing and producing sound. ![]()
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