This variable-frequency, audio bandpass filter is built around two
741 op amps that are connected in cascade. Two 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 voltage 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 kohm and its output impedance is less than 1 kohm
Variable-Frequency Audio Bandpass Filter Circuit Diagram
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