Here the 20 band graphic equalizer schematic diagram. This is stereo graphic equalizer, it should be 2×10 channel equalizer. Graphic equalizers device are popular with both domestic users and professional users. This equalizer is has simple design and easy to construct. It has no coil. It uses 15V split / dual polarity power supply to work (+15V / 0 / -15V). You may use search menu to find the circuit diagram of split / dual polarity / symmetrical power supply.
Equalizer allows the listener to correct deficiencies in the linearity of either his speaker system alone, or the combination of his speaker system and his living room.
20 Band Graphic Equalizer PCB design layout:
You can download the full explanation about how it’s work and also the detailed PCB layout and how to construct/assemble this equalizer circuit. Please download the document from the following link:
Good luck.. ðŸ™‚