Eric Johnson Tour A guitar pickup is essentially just like an energetic microphone coil. For decades, energetic microphones have been wired with the style coil attached to the principal of the microphone's transformer, and not introduced to floor (‘floating'). The microphone's case is typically connected to the cable shield, which is connected to the microphone amplifier's soil (see Rane's web site for more discussion).
By and big, active microphones are very calm units as a result of the combination of transformer solitude and balanced, flying sign lines through the duration of, along with shielded, humbucking coils.
Therefore why not guitars? Guitars are notoriously affected by noise. Humbucking pickups are merely a partial (though crucial!) solution. The obvious alternative is to float practicing the guitar collection to a balanced production, just like a microphone. A similar thought was printed this 2001 patent program such as Eric Johnson Tour?