What you will see in the following schematic diagram is Active Bandpass Filter Circuit using LM324 Low Power Quad Operational Amplifier. This active bandpass filter circuit uses semiconductors such 3 Lm324 op amps, Resistors (100 kOhm, 470 kOhms, 10 MOhms, 10 kOhms), Capasitors (330pF, 10uF), Fo= 1kHz, Q= 50 and Av= 100 (40dB).
This is an audio bandpass filter circuit which will filtering the audio frequency from 300Hz to 2500Hz.. The lower and higher audio frequency will be cut off. Download the explanation here