Any Love for the LM386?

[duck_arse]

your 100uF cap is always backwards. the (+) end of the cap ALWAYS goes to the more positive voltage. in this instance, supply is more positive than ground, 0V, earth. so that means the (-) end of the electro, which always goes towards the more negative voltage, goes to ground/0V.

if you don't know which will be the more and less positive than, use your multimeter. measure. one will read higher, one lower -- especially when you are supply bypassing.

and that gain cap between pin 1 and 8 is a special case -- look up the datsheet***, and see how they orient that cap. follow what they tell you, cause they know.




*** what am I saying, of COURSE you have all the datasheets right there in front of you already, don't you.

[GibsonGM]

https://www.ti.com/lit/ds/symlink/lm386.pdf

[Box_Stuffer]

Do you have the cap off of pin 7? In some designs it ends up being critical.

So - I bridged a 10nf cap from pin 7 to ground. No difference. 

[FiveseveN]

Should be 10uF, 1000 times bigger.

[brett]

+1 for needing a cap from Pin 7 to ground.  It provides an AC ground in the power supply that rejects supply-related feedback. 
Maybe not necessary at minimum gain (20), but essential at higher gain.