Left Handed Fender Bass A guitar pickup is essentially much like a vibrant mike coil. For many years, energetic microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and not recommended to surface (‘floating'). The microphone's event is usually linked to the wire guard, which can be connected to the mike amplifier's ground (see Rane's web site for more discussion).
By and big, dynamic microphones are extremely calm units as a result of the combination of transformer isolation and balanced, floating sign lines through the duration of, as well as shielded, humbucking coils.
So why not instruments? Guitars are once affected by noise. Humbucking pickups are only an incomplete (though essential!) solution. Well-known alternative is always to float the guitar pickup to a balanced production, just like a microphone. The same idea was printed this 2001 patent application such as Left Handed Fender Bass?