Above schematic diagram is 1 Watt stereo audio amplifier based IC KA2209 can be used for small electronic device such as radio, smartphone, tablets or other gadgets which require little sound amplification 😀
This is the text book circuit for this IC in stereo mode. It is ideal for battery powered operation. Power output depends critically on speaker resistance & supply voltage. At 3V into 4 ohm speakers the power is 0.1W. At 6V into 4 ohm speakers it is 0.65W. At 9V it is over 1W.
This stereo amplifier module uses the Samsung KA2209 8-pin IC. This IC can be replaced with TDA2822. It is designed for portable casette players & radios. It has a wide operating supply voltage of 1.8V to 9V so it is suitable for battery operation.
R3, R4 : 4R7 yellow violet gold
R1, R2 : 10K brown black orange
C1 : 10uF mini
C4, C5 : 100uF/25V electrolytic capacitor
C2, C3 : 470uF/16V electrolytic capacitor
C6, C7 : 100nF box capacitor
8 pin IC socket
Download the circuit manual: