Crossroads Guitar Festival 2016 A electric guitar pickup is basically just like an energetic mike coil. For decades, powerful microphones have been wired with the voice coil attached with the primary of the microphone's transformer, and maybe not recommended to surface (‘floating'). The microphone's case is typically connected to the cable shield, which will be attached to the mike amplifier's soil (see Rane's site for more discussion).
By and large, energetic microphones are very calm products consequently of the mix of transformer isolation and balanced, hanging indication lines all through, in addition to protected, humbucking coils.
So why don't you instruments? Guitars are once plagued by noise. Humbucking pickups are merely a partial (though essential!) solution. The obvious solution would be to float practicing the guitar pickup to a balanced output, being a microphone. A similar strategy was published this 2001 patent program like this Crossroads Guitar Festival 2016?