Tda 2030a is a 19W audio amplifier. I have connected a 25W 4ohm subwoofer to it. I have done the soldering and the circuit is working successfully but I want to understand the working and the calculation behind each component. The diagram is from the datasheet of the respective opamp of the company. The link is attached below.
I want to know why there is a potential divider at the start (fig 1) and the gain of the opamp consist of resistor in series with capacitor (fig 2) and the fig 3 doesn't make any sense to me to all.
I also want to know the calculations behind all of this. I know for sure that all of this has been done to reduce noise and improve gain but I do not understand how exactly everything is working.Can anyone help me ?!! Thank you so much for your contribution!!
Datasheet link: Tda2030a