Electric Guitar Repair Book A electric guitar pickup is essentially much like a powerful microphone coil. For decades, powerful microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and maybe not introduced to floor (‘floating'). The microphone's case is typically linked to the wire guard, which is connected to the mike amplifier's floor (see Rane's internet site for more discussion).
By and big, dynamic microphones are very calm devices consequently of the mixture of transformer isolation and balanced, hanging indication lines during, as well as guarded, humbucking coils.
So why not guitars? Instruments are once plagued by noise. Humbucking pickups are only an incomplete (though essential!) solution. The most obvious alternative would be to float the guitar pickup to a balanced production, being a microphone. A similar idea was printed this 2001 patent request like this Electric Guitar Repair Book?