Gretsch 12 String A guitar pickup is basically similar to a powerful microphone coil. For decades, energetic microphones have already been wired with the voice coil mounted on the principal of the microphone's transformer, and maybe not recommended to soil (‘floating'). The microphone's event is usually linked to the wire guard, that will be attached to the microphone amplifier's ground (see Rane's site for more discussion).
By and big, active microphones are very quiet devices as a result of the combination of transformer solitude and healthy, hanging transmission lines through the duration of, as well as protected, humbucking coils.
Therefore you will want to guitars? Guitars are once affected by noise. Humbucking pickups are just a partial (though important!) solution. The obvious option is to float practicing the guitar pickup to a balanced result, just like a microphone. An identical thought was printed this 2001 patent application such as Gretsch 12 String?