TUNABLE_NOTCH

Published:2009/7/2 22:01:00 Author:May | From:SeekIC

Opamp circuit requires only one pot (R1) to vary notch frequency. R2 is used to set noise rejection to maximum. With values shown, filter tunes from 170 Hz to 3 kHz, with 3-dB bandwidth of 230 Hz and notch rejection better than 40 dB over entire range. Circuit can be voltage-tuned by replacing R, with FET operated as voltage-variable resistor.-R. J.Harris, Simple Tunable Notch Filter, Wireless World, May 1973, p 253.



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