The circuit shown on the Picture 1 is phase-shift oscillator. The conditions for this circuit to start the oscillations are R1 = R2 = R3 = R and C1 = C2 = C3 = C and the feedback resistor is Rfb = 29R. The frequency of the oscillations and the conditions are defined with the formulas shown on Picture 2.
Picture 1: Phase-shift Oscillator circuit
Picture 2: Frequency of oscillations for phase-shift oscillator circuit
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