Feedback oscillator

  
Circuit oscillates because the transistor shifts the phase of the signal 180° from the base to the collector. Each of the RC networks in the circuit is designed to shift the phase 60° at the frequency of oscillation for a total of 180°
Feedback oscillator - schematic

The appropriate values of R and C for each network is found from f = l/2Vr3TrRC); that equation allows for the 60° phase shift required by the design.




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