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Wien bridge sine-wave generator

2016-05-15 08:06  
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Wien bridge sine-wave generator
Oscillation frequency of the circuit shown in the figure is about lkHz, and it uses the regulator 2DW78 to stabilize amplitude. Ifl. 5kΩ resistors in the bridge isreplaced bycoaxial double potentiometer, the band switch needs to access different capacitors, the output signal frequency can be adjusted continuously. The maximum frequency of oscillation circuit is decided by the characteristics of operational amplifier F007. And the greater resistance, capacitance on low frequency end will cause instability or leakage, so the input impedance of operational amplifier should be as high as possible.