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If you want to control the audio loudness level that means the volume control, you need to connect a 10 KΩ Potentiometer at the audio input, by connecting the potentiometer or POT you will adjust the audio loudness as required Additionally, a small capacitor at input should be connected in series with the for filtering purpose.

Must read Security Alarm Light using PIR Sensor This circuit produces a mono output from a stereo input.įor a stereo audio source you can also make two separate circuit of same- one for left and another for right channel audio input. But you can use the stereo to mono converter circuit to combine both audio channels to one.

But LM386 is a Mono Audio Amplifier, so we need to connect either the Left audio or the Right Audio from the source along with the ground. NOTE: Simple 3.5mm connector (without a microphone) will have three connections: Left Audio, Right Audio and Ground.We have given the audio input from a mobile phone using the 3.5mm connector.

The input can be given from any audio source like a mobile phone or a microphone. Note that the maximum power supply for LM386 is 15V. First, connect the power supply pins (Pins 6 and 4) to 12V and Ground respectively. The design of LM386 Audio Amplifier Circuit is very simple.Proper filtering must be done before connecting the output to a speaker as any DC signal might permanently damage the speaker. Pin 7 sets the path for decoupling and a capacitor must be connected between Pin 7 and Ground.We have used a 12V Power supply in this project. The maximum power supply to LM386 is 15V. Pins 6 and 4 are the power supply pins.The inverting input (Pin 2) of LM386 ic is connected to the Ground.Audio source connected at the audio input by using any audio player like mobile phone, laptops, music player or by using a microphone. Pins 2 and 3 are the inverting and non – inverting inputs of the amplifier (internally, they are connected to an OP-AMP).