Pedaltrain Metro 16 A electric guitar pickup is basically just like a dynamic mike coil. For decades, vibrant microphones have now been wired with the voice coil attached to the primary of the microphone's transformer, and not referenced to ground (‘floating'). The microphone's situation is normally linked to the cable shield, which will be attached to the mike amplifier's floor (see Rane's internet site for more discussion).
By and big, dynamic microphones are very quiet products consequently of the combination of transformer isolation and healthy, hanging indication lines through the duration of, along with guarded, humbucking coils.
Therefore why not instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are just an incomplete (though important!) solution. The obvious option would be to float practicing the guitar pickup to a healthy result, as being a microphone. A similar thought was printed this 2001 patent request such as Pedaltrain Metro 16?