Ashdown Ctm 30 A electric guitar pickup is basically much like a dynamic microphone coil. For decades, dynamic microphones have already been sent with the style coil attached to the primary of the microphone's transformer, and perhaps not called to floor (‘floating'). The microphone's case is typically linked to the wire shield, that is connected to the mike amplifier's floor (see Rane's site for more discussion).
By and big, energetic microphones are extremely calm devices as a result of the combination of transformer isolation and healthy, hanging transmission lines through the duration of, in addition to protected, humbucking coils.
Therefore why don't you instruments? Instruments are once plagued by noise. Humbucking pickups are only a partial (though crucial!) solution. The obvious answer is to float practicing the guitar collection to a balanced productivity, just like a microphone. The same thought was printed this 2001 patent request such as Ashdown Ctm 30?