Beatles Drum Heads A electric guitar collection is actually similar to a dynamic mike coil. For decades, active microphones have been wired with the voice coil mounted on the principal of the microphone's transformer, and not recommended to soil (‘floating'). The microphone's case is usually connected to the cable guard, which can be attached to the mike amplifier's soil (see Rane's site for more discussion).
By and large, active microphones are very calm products as a result of the combination of transformer solitude and balanced, hanging sign lines through the duration of, along with protected, humbucking coils.
Therefore why not instruments? Guitars are once overwhelmed by noise. Humbucking pickups are only an incomplete (though important!) solution. The obvious option would be to float practicing the guitar collection to a balanced production, being a microphone. A similar strategy was printed this 2001 patent application such as Beatles Drum Heads?