Roland Digital Piano Lx7 A electric guitar pickup is basically similar to an energetic mike coil. For decades, dynamic microphones have already been wired with the voice coil attached to the principal of the microphone's transformer, and not called to ground (‘floating'). The microphone's case is typically connected to the wire shield, that will be connected to the mike amplifier's surface (see Rane's site for more discussion).
By and big, vibrant microphones are very quiet devices as a result of the mix of transformer isolation and healthy, hanging indication lines for the duration of, as well as guarded, humbucking coils.
So you will want to instruments? Instruments are once overwhelmed by noise. Humbucking pickups are only a partial (though essential!) solution. The most obvious alternative is to float the guitar pickup to a healthy output, being a microphone. The same thought was published that 2001 patent request like this Roland Digital Piano Lx7?