The circuit diagram of frequency-adjustable band-pass filter (μA748)

Published:2011/8/9 2:40:00 Author:Felicity | Keyword: band-pass filter, frequency-adjustable | From:SeekIC

The resonant frequency of this filter can be adjusted by in-line potentiometer and Q can remain basically unchanged. Changing the position of the potentiometer is the same as adding a voltage divider. It can reduce the current that in R1, R2 and R3 which can be seen as increasing the resistance of R1, R2 and R3.As the potentiometer changed, the bandwidth and resonant frequency are also changed while Q remains basically unchanged. It’s because that the change of R1, R2, and R3 are the same. Changing the capacity of capacitor C1 can change the work frequency of the filter, but the adjustable extent of the bandwidth is not large.



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