Akg D5 Microphone A guitar pickup is basically just like a powerful mike coil. For decades, energetic microphones have been sent with the voice coil mounted on the principal of the microphone's transformer, and maybe not recommended to floor (‘floating'). The microphone's case is normally connected to the wire shield, which will be connected to the mike amplifier's floor (see Rane's site for more discussion).
By and large, dynamic microphones are extremely quiet devices consequently of the combination of transformer isolation and healthy, flying transmission lines for the duration of, along with guarded, humbucking coils.
Therefore why don't you guitars? Guitars are notoriously affected by noise. Humbucking pickups are only a partial (though important!) solution. Well-known option would be to float practicing the guitar pickup to a healthy production, being a microphone. An identical idea was printed this 2001 patent request such as Akg D5 Microphone?