TDA2003(Dual ) based 18W Bridge Amplifier circuit with explanation

The following schematic diagram is the diagram of 18W power amplifier. This amplifier built using 2 pieces of power ICs of TDA2003 with bridge connection (dual TDA2003). A TDA2003 gives 10W power output.
Circuit design:
18W TDA2003 bridge amplifier circuit
PCB layout:

TDA2003 18W bridge Amplifier PCB layout
Download TDA2003 Datasheet