Twin-T Audio Oscillator circuit

Posted on Feb 7, 2014

The output of this circuit should be fed into a high-impedance load, say >100K, remembering that the impedance of C4 is around 3K. A PNP transistor can also be used, with the necessary changes to the supply voltage. An op-amp can also be used, connected as follows: Op-Amp Transistor Output Collector Inverting Input Base Non-Inverting Input Emitter

Twin-T Audio Oscillator circuit
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R1 = R2 R3 = 0.1 x R1 C2 = C3 C1 = 2 x C2 R4 = 3K3 (approx) C4 = 50nF (approx) Q1 = any NPN audio amplifier. e.g. BC108, etc Vcc is not critical, 6 to 12Vshould work fine. Higher or lower voltages may also work OK.

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