Circuit diagram of the LM386 based audio amplifier is shown in the circuit. It is built around popular amplifier LM386 and 8-ohm, one-watt speaker (LS1), four capacitors and a few other components. Four electrolytic capacitors [two 10µF, 16V and two 220µF, 16V are used in this circuit. Before using this project, test it using the 6V battery. Connect the 8-ohm, one-watt speaker to output pin 5 of IC through 220uf . Switch on and keep VR to its mid position. Now, take a screwdriver and gently touch it on input terminal pin 3 of IC. You should hear a humming sound from the speaker. This will confirm that your circuit is working and ready to use.