John Mclaughlin Painter A guitar pickup is essentially just like an energetic mike coil. For decades, vibrant microphones have been wired with the style coil attached with the primary of the microphone's transformer, and maybe not introduced to floor (‘floating'). The microphone's case is normally attached to the cable shield, which will be linked to the mike amplifier's surface (see Rane's internet site for more discussion).
By and big, dynamic microphones are extremely calm products consequently of the combination of transformer isolation and balanced, flying sign lines through the duration of, in addition to protected, humbucking coils.
So why don't you guitars? Instruments are notoriously plagued by noise. Humbucking pickups are only an incomplete (though essential!) solution. The obvious answer is to move the guitar pickup to a balanced result, being a microphone. An identical idea was printed this 2001 patent request like this John Mclaughlin Painter?