There is a circuit of audio amplifer 80W as well, using IC TDA 2005 as a base circuit amplifier. The circuit of 2x40 Watt Audio Power Amplifier using TDA2005 can you see in the picture below.
Frequency Range: Approx. 20 Hz to 22 KHz.
Input Sensitivity: Approx. maximum 150 mV rms. .
Power supply: + 8 to 18 volts, approx. 3.5 Amps maximum per channel.