Published:2009/7/3 2:58:00 Author:May | From:SeekIC
Uses RC notch circuit as feedback element for active-filter opamp. With tuning pot set for center frequency of 1000 Hz, 3-dB bandwidth is 23 Hz and 10-dB bandwidth is 68 Hz. At 1000 Hz, voltage gain is 36 dB. High-frequency rolloff is good, being 43 dB down at 2000 Hz, so circuh converts 1000-Hz square wave into sine wave. Artide gives design equations.-C. Hall, Tunable RC Notch Filter, Ham Radio, Sept. 1975, p 16-20.
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