Piano Digital Korg B1sp A guitar pickup is basically much like a dynamic microphone coil. For decades, vibrant microphones have been wired with the voice coil mounted on the principal of the microphone's transformer, and maybe not recommended to floor (‘floating'). The microphone's situation is typically connected to the cable guard, that will be connected to the mike amplifier's soil (see Rane's web site for more discussion).
By and large, energetic microphones are very calm devices as a result of the combination of transformer isolation and healthy, hanging sign lines through the duration of, along with protected, humbucking coils.
So why don't you guitars? Instruments are once overwhelmed by noise. Humbucking pickups are just a partial (though essential!) solution. The most obvious answer would be to float the guitar pickup to a healthy output, being a microphone. A similar strategy was printed this 2001 patent application such as Piano Digital Korg B1sp?