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Wattage output of LM386N-1

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You didn't look very hard. I googled "LM386" and it was the first hit.
 

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The datasheet lists the output power at a horrible-sounding 10% clipping distortion.
The amplifier is clipping because its volume control is turned up way too high to make more output power as square-waves.

With a 6V supply and an 8 ohm load, 325mW is listed but the graph of its distortion shows that it clips at an output power of only 200mW.
 

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