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Transducer Piezoelectric Sounder
Small sounders use this effect to convert alternating voltages into mechanical vibrations and sound.
If an alternating voltage is applied to the conducting surfaces, the quartz vibrates and sound is produced.
Versions of this device exist with built-in electronics to produce the alternating voltage.
If you want the lower cost version, you have to build your own astable circuit to produce the alternating voltage.
These sounders are found in Christmas and birthday cards as well as low cost alarm clocks.
The effect is also used to focus the LASER that reads data from CD, DVD and Blu-Ray disks. Anti camera shake technology uses the effect too. Most surprising is the gas stove lighter where the quartz deformation produces a potential difference big enough to make a spark to light the gas.
Quartz is a very hard crystalline substance that shows the effect strongly.
Quartz is also mechanically and chemically stable so it doesn't change or deteriorate with time. A quartz crystal cut to the correct size and shape will ring like a tuning fork producing an AC output on a precise frequency determined by the dimensions of the crystal. This effect can be used to build an oscillator. They are used for extremely accurate frequency generation for radio transmitters.
Input: An alternating voltage at the frequency wanted for the sound waves.
Output: Pressure or sound waves, usually in air.
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