Simple Wien-Bridge Oscillator

  
Incandescent lamp has been used to reduce harmonic distortion in sine oscillator circuit. The nonlinear resistance characteristic of the lamp filament help the circuit to shape the signal to approximate the ideal sine wave. Here is the classic Wien-bridge oscillator circuit using the incandescent lamp..

Simple Wien-Bridge Oscillator - img1

You can change the frequency of the oscillator by modifying the R1 (and R2), or C1 (and C2).



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