Percussion Box Drum A best guitar pickup is actually just like a dynamic mike coil. For decades, powerful microphones have now been wired with the voice coil mounted on the primary of the microphone's transformer, and perhaps not called to surface (‘floating'). The microphone's situation is normally linked to the cable shield, that is linked to the mike amplifier's ground (see Rane's website for more discussion).
By and large, dynamic microphones are very calm units consequently of the mixture of transformer isolation and healthy, flying transmission lines throughout, in addition to protected, humbucking coils.
So why don't you guitars? Instruments are once plagued by noise. Humbucking pickups are merely an incomplete (though essential!) solution. Well-known answer is always to move your guitar collection to a healthy production, just like a microphone. The same idea was printed this 2001 patent request like this Percussion Box Drum?