AN5265 sound circuit

Relevant key device information applied in this article: AN5265 AN5265 pin functions and reference voltage: Pin 1: 12V - pre-stage power supply Pin 2: 5V - audio signal input terminal Pin 3: 0V - mute control terminal (high mute when level) Pin 4: 0.1V - Volume control voltage input pin 5: 7V - Filter terminal 6: 7.4V - Negative feedback input pin 7: 0V - Ground pin 8: 7.5V - Power Pin 9 of the amplifier output: 15V - power amplifier level