300_3000_Hz_TUNABLE_FOUR_FUNCTION

Published:2009/7/3 3:00:00 Author:May | From:SeekIC

Provides choice of high-pass, bandpass, low-pass, and tunable notch outputs. Uses National LM324 quad opamp. Tuning pots are ganged 500K 2-W carbon with reverse log taper. Notch of -35 dB is 200 Hz wide at -3 dB points. Notch output has unity gain with respect to input signal, but other three outputs provide gain.-P.A. Lovelock, Discrete Operational Amplifier Active Filters, Ham Radio, Feb.1978, p 70-73.



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