1_kHz_THREE_FUNCTION

Published:2009/7/2 21:50:00 Author:May | From:SeekIC

Uses National LM324 quad opamp, with appropriate biasing for single supply of +5 to +25 VDC. Values of R1 and R2 establish fc at 1000 Hz, while R3 gives Q of 50. Values of R1 and R2 for other bandpass center and cutoff frequencies fc can be calculated from R = 15 ×107/fc. Fourth opamp may be used as output amplifier or for summing highpass and low-pass outputs. C1 is same as C2.-P. A. Lovelock, Discrete Operational Amplifier Active Filters, Ham Radio, Feb. 1978, p 70-73.



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