Bigger Crash Cymbals A guitar pickup is essentially much like a dynamic mike coil. For many years, energetic microphones have now been wired with the style coil attached with the primary of the microphone's transformer, and not referenced to surface (‘floating'). The microphone's case is normally attached to the cable guard, which is connected to the microphone amplifier's surface (see Rane's website for more discussion).
By and big, dynamic microphones are very calm products as a result of the mix of transformer isolation and healthy, floating sign lines all through, along with shielded, humbucking coils.
So why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are merely an incomplete (though important!) solution. The obvious alternative would be to move the guitar pickup to a balanced result, just like a microphone. An identical idea was printed this 2001 patent application such as Bigger Crash Cymbals?