Power amplifier composed of LM2876

Single power supply crrL power amplifier circuit composed of LM2876. The external transistor VTf provides the midpoint level (pin 7)
for the LM 2876 in the form of an emitter output , ensuring the reliable operation of the noise suppression circuit in the IC and the bias of the related circuits.
Push button switch SA is a silent switch . Potentiometer RP is the volume control. Capacitor C4 is a 7-pin AC grounding capacitor . Its purpose
is to improve the common mode rejection ratio of the power amplifier and improve the sound quality of the power amplifier .