Audio equalizer circuit diagram 7 band:

This is an audio equalizer circuit diagram, 7-band. It’s an audio graphic equalizer board. It’s a mono board. It has 7 audio graphic controllers. needs AC 18-0-18 voltage.positive, negative, and ground voltage. one input and one output. Every amplifier needs this type of board to control the sound.

DIY amplifier circuit using STK4141:

This is a DIY amplifier circuit using STK4141. We can get 25-0-25 watts using this diagram. We can use 15-0-15 voltage to a maximum of 24-0-24 voltage. The voltage depends on the IC quality. STK is the best sound quality amplifier. Sony Sound is making maximum use of the STK IC. It’s a stereo audio diagram. This diagram also includes a bass tone circuit with a pre-amplifier. The pre-amplifier uses the 4558D IC.