4 Band Equalizer
The following diagram is the four band equalizer circuit. Equalizer is generally used to improve the fidelity of sound, to emphasize certain instruments, to remove undesired noises, or to create completely new and different timbres.
The equalizer uses four pieces of variable resistor to cut and boost four range of audio frequency, that are:
- Low frequency: Freq. 35-680Hz
- Medium frequency: Freq. 150-3kHz
- Medium/semi high frequency: Freq. 450-8.5kHz
- High audio frequency: Freq. 750-15kHz
Download 4 Band Equalizer circuit in PDF document: