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Colpitis oscillator

2016-08-22 22:05  
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Bias for the pnp bipolar transistor is provided by resistor voltage divider network R1/R2. The collector of the oscillator transistor is kept at ac ground by capacitor C5, placed close to the transistor.
Colpitis oscillator

Feedback is provided by capacitor voltage divider C2/C3.

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