Describe your view about piezoelectric generator.

Piezoelectric generator:

A slab of piezoelectric crystal is acquired and using that parallel plate capacitor is made. After that with other electronic components an electronic oscillator is designed to generate electrical oscillations > 20 kHz. Usually one can generate ultrasonic waves of the order of MHz by using piezoelectric generators.
Quartz slabs are preferred since this possesses rare physical and chemical properties. As a typical circuit diagram is demonstrated below:

The tank circuit has a variable capacitor 'C' and an inductor 'L' that selects the frequency of the electrical oscillations. While the circuit is closed current rushes by the tank circuit and the capacitor is charged, after completely charged no current passes through similar. After that the capacitor starts discharging by the inductor and therefore the electric energy is into the form of electric and magnetic fields connected with the capacitor and the inductor respectively. Therefore we obtain electrical oscillations in the tank circuit and along with the help of the other electronic components with a transistor, electrical oscillations are produced continuously. It is fed to the secondary circuit and the piezoelectric crystal (into our case a slab of properly cut quartz crystal) vibrates, as this is continuously subjected to varying (alternating) electric field, and generates sound waves. While the frequency of electrical oscillations is into the ultrasonic range in that case ultrasonic waves are generated. While the frequency of oscillation is matched along with the natural frequency of the piezoelectric slab in that case it will vibrate along with maximum amplitude. The frequency generated is demonstrated below:

f = p/2l (√E/ρ)

Here p = 1, 2, 3, ..., l is the thickness of the piezoelectric plate, ρ- the density of the piezoelectric material and E- the Young's modulus of the piezoelectric material.