Casio Privia Px110 A electric guitar collection is actually just like an energetic microphone coil. For decades, energetic microphones have now been wired with the voice coil mounted on the primary of the microphone's transformer, and not introduced to ground (‘floating'). The microphone's event is typically attached to the cable guard, that will be linked to the microphone amplifier's surface (see Rane's website for more discussion).
By and big, active microphones are extremely calm products consequently of the mixture of transformer isolation and healthy, floating indication lines throughout, in addition to protected, humbucking coils.
Therefore why don't you instruments? Guitars are notoriously plagued by noise. Humbucking pickups are only an incomplete (though crucial!) solution. Well-known alternative is to float practicing the guitar pickup to a balanced production, just like a microphone. A similar thought was printed this 2001 patent application such as Casio Privia Px110?