60_Hz_TUNABLE_NOTCH

Published:2009/7/3 3:39:00 Author:May | From:SeekIC

Can be used to minimize hum pick up from AC line. Circuit tunes from 40 to 120 Hz with single pot. Artide gives design equations. With unmeasured ceramic disk capacitors and 5% resistors, notch depth at 60 Hz was 44.5 dB. By selecting capacitors with equal values and replacing 333K with 500K trimpot, careful adiustment increases notch depth to 57 dB.-C. Hall, Tunable RC Notch Filter, Ham Fladio, Sept. 1975, p 16-20.



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