How Fuzz (audio effect) works?
And of course, how fuzz works (in general).


In words, adding fuzz is adding harmonics to the original signal.  Harmonics are frequencies that are higher than the original signal but are tonally related.

More technically, this circuit essentially converts a sine wave



to something resembling a square wave



A sine wave is a pure tone which sounds dull



but a square wave contains the pure tone as well as odd order harmonics



which sounds more interesting.