how to make audio equalizer?

how to make an audio equalizer?

The audio equalizer is an important circuit for any amplifier. if we want to control the audio quality like bass, tone, high, low. normally all kinds of amplifiers got an audio equalizer. sometimes we need this equalizer circuit diagram.

This is a High low and mid control circuit diagram

This is 4 volume audio equalizer. It’s a mono audio equalizer. if we want stereo then we have to use 2 circuit

For making this PCB