The gain range is 20 to 200, gain is internally set to 20 (without using external component) but can be increased to 200 by using resistor and capacitor between PIN 1 and 8, or just with a capacitor. LM386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios, guitars, toys etc. This circuit is based on LM386 IC to amplify sound. It is inexpensive, low power operated and only need few components to work. It can also be used as sound sensor for microcontrollers. This circuit can also be used in many applications like portable music players, intercoms, radio amplifiers, TV sound systems, Ultrasonic drivers etc. This circuit can be used as “Small mic and loudspeaker system” for a small space like a room. Simple Mic audio amplifier can amplify sound that is given from Microphone.
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