Electro pneumatic converter keeps track of temperatures while mixing chemicals. Or a pneumatic transducer keeps track of pressure inside a tank or cylinder. Calipers or micrometers to carefully measure distance. Almost without exception, there is a standard trade off in choosing the best device.
The oscillation during the drive of capacitive loads can sometimes lead to distortion or damage of the amplifiers. They are quite advantageous in this regard. Actually, their utility is much higher than that of the ribbon based instruments. This answers the question why piezoelectric speakers are generally used in single frequency or non-critical applications.There are special circumstances where the piezoelectric speakers are used both as input and output devices. Sonar application is one such example. There the use is to generate underwater sound. One of the main disadvantages is that their frequency response, more often than not, is quite substandard in comparison to other prevalent technologies. This is the air pressure regulator and for input the use is to act as a sensing part.
The amount of charge depends upon the voltage of the battery, the respective surface area of the diaphragm and the air regulator, and on the distance between them. The greatly-liked type is the condenser type. Here the air regulator is mounted close to a rigid back plate and a battery is connected to the plate, thereby creating an electric charge between them.
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