12W mono OCL power amplifier circuit

The figure below shows the 12 W mono OCL power amplifier circuit.

The IC uses the audio power amplifier integrated circuit TDA2006, with a closed-loop voltage gain of 30 dB, short-circuit protection and overheating protection, and a ±12 V dual power supply. The audio signal is input from pin ① of TDA2006 and output from pin ④ after power amplification. Pin ⑤ is the positive power supply terminal, and pin ③ is the negative power supply terminal.