Frequency adjustable bandpass filter circuit

Published:2011/6/23 22:05:00 Author:TaoXi | Keyword: Frequency adjustable, bandpass, filter | From:SeekIC

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.



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