Wien Bridge Oscillator Schematic. The wien bridge oscillator is based on the bridge circuit it consists of four resistors and two capacitors and it is used for the measurement of impedance. For oscillator that can provide frequency more than 1mhz lc network is used.
The figure below shows the transistorized wien bridge oscillator which uses two stage common emitter transistor amplifier. Each amplifier stage introduces a phase shift of 180 degrees and hence a total 360 degrees phase shift is introduced which is nothing but a zero phase shift condition. The circuit diagram of wien bridge oscillator is shown in the figure below.
The figure below shows the transistorized wien bridge oscillator which uses two stage common emitter transistor amplifier.
The phase shift across the network lags with increasing frequency and leads with decreasing frequency. The t1 is fet that is used as the variable resistors as the feedback of ic2 the gain of op amp is controlled by the voltage and changing the control voltage of t1 by p2. The figure below shows the transistorized wien bridge oscillator which uses two stage common emitter transistor amplifier. The wien bridge oscillator is widely used for generating sinusoids in the frequency range below 1 mhz.
