I managed to create a basic audio amplifier using the IC LM386. This post is just a walk through to the creation. LM386 is a very good audio amp, but sometimes it tends to oscillate at low frequencies hence producing a lot of unwanted noise. The basic circuit is
Put this on a bread board. And connect a 3.5mm jack to the other end to input Vin. Use a coupling capacitor of possibly 10uF. The 10K Pot is to control the intensity. Use Vcc of around 9V. I've used a 8ohm speaker.
There is one more mode according to the datasheet. This is supposed to provide a gain of 200.
Sometimes when the gain is more the output is distorted. Be sure to keep that in mind. It is not that powerful. I've always had a hard time handling it, lot of distortions and noise. Check out other modes, experiment, enjoy.