This is 2x1W stereo audio amplifier circuit based on single IC KA2209. IC KA2209 is an equivalent IC to the TDA2822, you can use TDA2822 if you can’t find KA2209. 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.
R1 R2_______10K R3 R4_______4R7 C1__________10uF mini C2, C3______470uF/16V C4, C5______100uF/25V C6, C7______100nF IC__________KA2209/TDA2822 IC socket___8 pin
The kit for this circuit is available at elektronickits.com
Download 2x1W Stereo Audio Amplifier with IC KA2209 circuit tutorial HERE
[...] circuit is an amp from a a small computer speaker set I had. It is based on two KA2209 chips. I could have made my own, but this one was perfect. These can take quite a bit of [...]