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OSCILLATOR
CRYSTAL OSCILLATORS - 14181_100

Neets Module 09-Introduction to Wave-Generators and Wave-Shaping Circuits
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2-35 The ARMSTRONG OSCILLATOR is used to produce a sine-wave output of constant amplitude and fairly constant frequency. An oscillator in which dc power is supplied to the transistor through the tank circuit, or a portion of the tank circuit, is SERIES FED. An oscillator in which dc power is supplied to the transistor through a path separate and parallel to the tank circuit is PARALLEL or SHUNT FED. The HARTLEY OSCILLATOR is used to produce a sine-wave output of constant amplitude and fairly constant frequency. The COLPITTS OSCILLATOR is used to produce a sine-wave output of constant amplitude and fairly constant frequency within the rf range. The identifying features of the Colpitts oscillator are the split capacitors. The RESISTIVE-CAPACITIVE (RC) FEEDBACK OSCILLATOR is used to produce a sine- wave output of relatively constant amplitude and frequency. It uses RC networks to produce feedback and eliminate the need for inductors in the resonant circuit.






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