Transistorised Wein Bridge Oscillator
Model No. HV-EXP2465
Positive feedback in Wein-Bridge Oscillator is to use two stage RC coupled Amplifier. Since first stage of the RC-Coupled amplifier introduces a phase shift of 180 degree. Second stage introduces phase shift of 360 degree. Positive feedback network makes the input Vin and output Vout in the same phase. The frequency of oscillator. In addition to the positive feedback the circuit is also provided with negative feedback to make the oscillations stable. Observe the output waveform on CRO. By varying the resistor R1 the frequency will change..
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