Tool And A Perfect Circle A guitar pickup is actually just like a dynamic microphone coil. For many years, energetic microphones have now been wired with the style coil mounted on the principal of the microphone's transformer, and not called to soil (‘floating'). The microphone's case is typically connected to the cable guard, which will be connected to the microphone amplifier's surface (see Rane's site for more discussion).
By and large, active microphones are very calm products consequently of the mix of transformer solitude and healthy, flying indication lines for the duration of, in addition to protected, humbucking coils.
So why not instruments? Guitars are notoriously affected by noise. Humbucking pickups are merely an incomplete (though essential!) solution. Well-known answer would be to move practicing the guitar pickup to a healthy result, being a microphone. An identical idea was printed this 2001 patent application such as Tool And A Perfect Circle?