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2.5kHz Wien Bridge Signal Generator Circuit

2016-05-16 22:46  
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2.5kHz Wien Bridge Signal Generator Circuit
This signal generator is a kind of RC Wien Bridge oscillator Circuit. As seen in the figure, secondary direct-coupling amplifier is composed of triode VT1 and VT1. The input is in a form of bootstrap, making the input impedance much higher to reduce effects on phase-shifting circuit RC. As to the T-type attenuator connected to the output terminal, on one hand, it can meet the demands of output impedance, on the other hand it can reduce the effects that loads have on RC. In this case, the frequency stability of the oscillator depends on that of RC. Because of low-temperature coefficient of RC, the frequency of this oscillator is stable(25℃±15℃, change range ≤±5Hz).