Piezo buzzers are small electronic devices that emit sounds when driven by low voltages and currents. They are also called piezoelectric buzzers. They usually have two electrodes and a diaphragm. The diaphragm is made from a metal plate and piezoelectric material such as a ceramic plate.
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Piezo buzzers operate using the piezoelectric effect. A voltage that is applied to the leads causes the piezoelectric element to shrink or stretch. This makes the diaphragm vibrate as it bends, thereby producing sound waves. Piezoelectric elements are made from crystals, such as quartz or Rochelle salts.
The sounds emitted may be extremely low or ear-piercing. They may be made loud enough to cause hearing loss. These sounds include noises such as buzzing, chirping, ringing, sirens, and beeps.
Piezo buzzers are popular in hobby circuits. Depending on the nature of the design, they may be substituted in place of LEDs and hobby motors, for example. They are sometimes added to projects in order to produce sound effects.
Piezo buzzers are used in security devices or to sound warnings and alerts. These include burglar alarms, watch alarms, smoke detectors, telephones, microwaves, and the like.
Piezo buzzers are found in toys, greeting cards, and are popular in robotics. They are also used as sensors, and can even function as speakers.
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