Piano Keyboard Desk A electric guitar collection is basically much like a powerful microphone coil. For decades, dynamic microphones have now been wired with the voice coil attached to the primary of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's situation is normally attached to the wire guard, which can be connected to the mike amplifier's surface (see Rane's site for more discussion).
By and big, powerful microphones are very quiet devices as a result of the mix of transformer isolation and healthy, hanging indication lines through the duration of, in addition to shielded, humbucking coils.
Therefore why not guitars? Instruments are once plagued by noise. Humbucking pickups are only an incomplete (though important!) solution. Well-known answer is always to float your guitar pickup to a balanced output, being a microphone. The same idea was printed that 2001 patent application such as Piano Keyboard Desk?