Usb Audio Interface Problem A guitar pickup is actually much like a powerful mike coil. For decades, active microphones have already been sent with the voice coil attached with the primary of the microphone's transformer, and not introduced to soil (‘floating'). The microphone's event is typically attached to the cable guard, which is connected to the mike amplifier's floor (see Rane's site for more discussion).
By and big, energetic microphones are very calm devices consequently of the combination of transformer isolation and healthy, suspended indication lines all through, in addition to guarded, humbucking coils.
So why don't you guitars? Guitars are notoriously plagued by noise. Humbucking pickups are merely an incomplete (though important!) solution. The obvious answer would be to move practicing the guitar pickup to a balanced production, just like a microphone. The same idea was printed this 2001 patent program such as Usb Audio Interface Problem?