How to correctly connect audio plug to LM386?
If you want both the left and right channels to provide audio you need to make a little mixer.

Two resistors (around 10KΩ) connected to the left and right inputs (pins 2 and 5), then joined together, will make a simple mixer.  Then you link that to the LM386's IN + through a capacitor (around 10µF is usually OK).

Pin 1 links direct to the IN - 

You ignore pins 3 and 4 - they are used to pass the audio through to another destination (internal speakers) when there is no plug in the socket.







simulate this circuit &ndash; Schematic created using CircuitLab