There are also disadvantages: some amplifiers can oscillate when driving capacitive loads like most piezoelectrics, which results in distortion or damage to the amplifier. Piezoelectric speakers have several advantages over conventional loudspeakers: they are resistant to overloads that would normally destroy most high frequency drivers, and they can be used without a crossover due to their electrical properties. They are also used for producing ultrasound in sonar systems. Piezoelectric speakers are frequently used to generate sound in digital quartz watches and other electronic devices, and are sometimes used as tweeters in less-expensive speaker systems, such as computer speakers and portable radios. Typically they operate well in the range of 1-5 kHz and up to 100 kHz in ultrasound applications. Ĭompared to other speaker designs piezoelectric speakers are relatively easy to drive for example they can be connected directly to TTL outputs, although more complex drivers can give greater sound intensity. The prefix piezo- is Greek for 'press' or 'squeeze'. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and this motion is typically converted into audible sound using diaphragms and resonators. When fixed to a metallic diaphragm and excited with an alternating voltage, the diameter of the disc varies by a small amount, this causes dishing of the diaphragm which gives a much louder sound.Ī piezoelectric speaker (also known as a piezo bender due to its mode of operation, and sometimes colloquially called a " piezo", buzzer, crystal loudspeaker or beep speaker) is a loudspeaker that uses the piezoelectric effect for generating sound. The white ceramic piezoelectric material can be seen fixed to a metal diaphragm.
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