VARIABLE_FREQUENCY_AUDIO_BP_FILTER

Published:2009/6/16 2:53:00 Author:May | From:SeekIC

This variable-frequency, audio bandpass filter is built around two 741 op amps that are connected in cascade. Tro 741 op amps are configured as identical RC active filters and are connected in cascade for better selectivity. The filter's tuning range is from 500 Hz to 1500 Hz. The overall volt-age gain is slightly greater than 1 and the filter's is about 5. The circuit can handle input signals of 4 V peak-to-peak without being overdriven. The circuit's input impedance is over 200 kQ and its output impedance is less than 1 kQ.



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