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Frequency adjustable bandpass filter circuit

2017-02-24 20:13  
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Frequency adjustable bandpass filter circuit
Frequency adjustable bandpass filter circuit
The frequency adjustable bandpass filter circuit is as shown in the figure. This filter's resonance frequency can be adjusted through the coaxial potentiometer, and the Q value will not change when you are adjusting the frequency. The Q value of the active band-pass filter of the figure is about 30, the resonant frequency can be changed from 150Hz to 1.5kHz, in this range the changing range of Q is less than 5%. For ease of the calculation, you need to set the potentiometer to the top, the resonant frequency f0 and the bandwidth B are: Changing the position of the potentiometer is equivalent to add a voltage divider, so the current of R1, R2 and R3 reduce.