14_kHz_TWIN_T_BANDPASS

Published:2009/7/2 21:08:00 Author:May | From:SeekIC

Combination of passive twin-T bandpass filter and 741 opamp gives simple audio filter for amplifying narrow frequency band (about 300 Hz wide) centered on 1.4 kHz. Filter ean be tuned to other frequencies by replacing R1 and R2 with 10K pots. Frequency is equal to 1/6.28RC where R is value in ohms of R1 and R2 and C is capadtance in farads of C1 and C2. R3 is half of R1.-F. M. Mims, Integrated Circuit Projects, Vol. 2, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 71-80.



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