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.

Components List:

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
IC KA2209
8 pin IC socket

Download the circuit manual:

CK704 - 1W Stereo Amplifier Module

1 file(s) 179.22 KB

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