Green Day Tour Dates A guitar collection is basically just like a powerful mike coil. For decades, active microphones have now been wired with the style coil mounted on the primary of the microphone's transformer, and not referenced to soil (‘floating'). The microphone's situation is usually attached to the wire shield, which will be attached to the microphone amplifier's surface (see Rane's website for more discussion).
By and large, dynamic microphones are very quiet devices as a result of the mix of transformer isolation and balanced, hanging indication lines for the duration of, as well as guarded, humbucking coils.
So why not instruments? Instruments are notoriously affected by noise. Humbucking pickups are merely a partial (though crucial!) solution. The obvious solution is always to float practicing the guitar pickup to a healthy output, just like a microphone. A similar idea was printed this 2001 patent request like this Green Day Tour Dates?