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Wien bridge sine wave generator composed of F007

2016-05-15 02:58  
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Wien bridge sine wave generator composed of F007
Figure shows the Wien bridge sine wave generator circuit. The regulator circuit is the Wien bridge oscillator circuit which is used to achieve steady increases, the oscillation frequency is 1kHz. If it uses coaxial double potentiometer to replace the l.5kΩ resistor of bridge, or changes the capacitor values by band switch, the output frequency can be adjusted. The highest frequency of the circuit is decided by the operational amplifier's frequency characteristics, while the low frequency side requires a larger resistance value, so the requirements of the op amp's input impedance should be as high as possible. Connecting in series with a 30kΩ resistor in a voltage-regulator tube branch, the branch is connected to between the 680Ω and 3.9kΩ resistor in order to make gain changes be not too fast. The use of soft breakdown characteristic regulator can reduce the distortion. Distortion can be up to 0.5%.