The electronic hobbyist news blog
This project shows how to build an Audio amplifier based on LM386 IC. The circuit is very simple and construction is easy on a breadboard. The circuit is found on this website.
LM386 Audio Amplifier – [Link]
The circuit is missing the very important capacitor and series resistor at the output of the LM386 amplifier that is shown on every circuit in its datasheet.
None of the many circuits in the datasheet have R1 that this circuit has. R1 steals much of the max output power and is not needed and not wanted.
Also R4 steals much of the max output power and is not needed and not wanted.
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