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Wien Bridge Sine-Wave Generator Circuit Composed of F007

2016-05-14 22:26  
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Wien Bridge Sine-Wave Generator Circuit Composed of F007
As seen in the figure is wien bridge sine-wave generating circuit. This circuit uses voltage stabilizing diode to stablize amplitude, and the oscillate frequency is 1kHz. If we replace the 1.5kΩ resistance with a coaxial duplex potentiometer, or change the capacitor value with a wave band switch, we can adjust the output frequency. The highest frequency of a circuit is decided by operational amplifier's frequency characteristic, while the low frequency terminal requires a larger resistance value, so the operational amplifier's input impedance should be as high as possible. In the voltage stabilizing diode branch, which is between the 680Ω and 3.9Ω resistance, there is a 30kΩ resistance to prevent the gain change from varying too quickly. If voltage stabilizing diode with soft breakdown characteristic is used, there will be less distortion, and the distortion rate can reach 0.5%.