Power generation when given pressure (piezoelectric transducer) use crystals of quartz or Roberto chenson (rochelle salt is salt, sodium and potassium rotkhong Tateyama) lot adjacent to the diaphragm. When electricity is available through the crystals will cause vibration. In contrast, if there is travelling is diaphragm will cause a power-up that the surface of the crystals. Transducers, this model is suitable for use in monitoring the direct listen that wave has no force, and the crystals are easy. If the voltage through the crystals too strong.
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