The amplifier has three stages, the first stage is a differential amplifier that amplifies the difference between two input voltage, in this case the output voltage of the amplifier (this is negative feedback to stabilize the amplifier) and the input voltage. The output voltage from the differential amplifier is fed to the common emitter amplifier which is the second stage. The output of the second stage is fed to the class AB push-pull which is the final stage. The capacitors in the amplifier acts to eliminate dc from ac. The R1 :IE 470ohm and R2 :IE 470ohm are voltage divider, they biased the differential amplifier. R8 IE 4.7K from the feedback, limits the current from the output. R7 :IE 470ohm biased Q2. the diodes D1 and D2 biased the push-pull Class AB. R6 :IE 470 ohm is the load of the common emitter amplifier. Again note to all new comers to Everycircuit. If you click “in Chrome” or tap “in app” on a user names you will see their profile and a list of their public circuits for viewing.
