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A crystal oscillator generates electrical oscillation of constant frequency based on the _________ effect.
- a)ultrasonic
- b)magnetic
- c)piezoelectric
- d)photoelectric
Correct answer is option 'C'. Can you explain this answer?
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A crystal oscillator generates electrical oscillation of constant freq...
Crystal Oscillator:
- It operates on the principle of the inverse piezoelectric effect in which alternating voltage applied across the crystal surfaces causes it to vibrate at its natural frequency.
- It is these vibrations that eventually get converted into oscillations.
- These oscillators are made of Quartz crystal Rochelle salt and Tourmaline.
- Quartz is inexpensive, naturally available, and mechanically strong when compared to others.
- In crystal oscillator, the crystal is suitably cut and mounted between two metallic plates as shown in the figure.
Rs → Low value
Ls → Large value
Cs → small value
Cp = Capacitance of electrode
- In reality, the crystal behaves like a series RLC circuit
- The Inductor L, capacitor C, and Resistor R are the analogous of mass, the compliance (reciprocal of spring constant), and the viscous damping factor of the mechanical system.
- Due to the presence of Cp, the crystal will resonate at two different frequencies.
(1) Series resonant frequency - 
(2) Parallel resonant frequency - 
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A crystal oscillator generates electrical oscillation of constant frequency based on the _________ effect.a)ultrasonicb)magneticc)piezoelectricd)photoelectricCorrect answer is option 'C'. Can you explain this answer?
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