Guitar Fuzz Pedal A guitar pickup is basically just like a powerful microphone coil. For many years, dynamic microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and not introduced to soil (‘floating'). The microphone's case is normally attached to the wire shield, that is connected to the mike amplifier's floor (see Rane's internet site for more discussion).
By and large, powerful microphones are very quiet units as a result of the mix of transformer isolation and balanced, floating sign lines for the duration of, along with shielded, humbucking coils.
So why don't you guitars? Guitars are notoriously plagued by noise. Humbucking pickups are only an incomplete (though crucial!) solution. The obvious option is always to float the guitar pickup to a balanced production, being a microphone. An identical strategy was printed this 2001 patent application like this Guitar Fuzz Pedal?