Yamaha C7 Piano A electric guitar collection is essentially just like an energetic mike coil. For many years, powerful microphones have now been wired with the voice coil attached to the principal of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's case is typically connected to the wire guard, that will be connected to the microphone amplifier's floor (see Rane's site for more discussion).
By and big, energetic microphones are extremely calm units consequently of the mix of transformer isolation and balanced, floating indication lines during, as well as protected, humbucking coils.
So you will want to guitars? Instruments are once plagued by noise. Humbucking pickups are only an incomplete (though important!) solution. The obvious answer would be to float the guitar pickup to a balanced result, just like a microphone. The same idea was printed this 2001 patent application such as Yamaha C7 Piano?