This circuit IC1 TDA2822 number as your primary device. The Dual Amplifier IC or IC stereo gain at 40 dB. Bandwidth 120 kHZ. That is about 2 watts and watt power supply of 1.8 to 15 volts and a current 6 mA only
When using the power supply 9 volt into this circuit.VR1 and VR2 to adjust the signal level of the right and left, the pin 7 and pin 6 of IC1.The amplifier IC1 is out of the output pin 1 and pin 3, through the C4 and C5 coupling signals to the left and right speakers.The C6, R1 and C7, R2 is to reduce noise.