Bc Rich Jr V A guitar pickup is basically just like a powerful mike coil. For decades, active microphones have now been wired with the style coil attached to the primary of the microphone's transformer, and perhaps not introduced to floor (‘floating'). The microphone's event is normally connected to the wire guard, that is linked to the microphone amplifier's floor (see Rane's internet site for more discussion).
By and big, powerful microphones are extremely quiet units consequently of the mix of transformer isolation and balanced, hanging transmission lines through the duration of, as well as protected, humbucking coils.
Therefore why don't you instruments? Instruments are notoriously affected by noise. Humbucking pickups are just a partial (though crucial!) solution. Well-known answer is always to float practicing the guitar pickup to a balanced output, being a microphone. The same idea was printed this 2001 patent request such as Bc Rich Jr V?