Takamine Jasmine S35 A guitar pickup is actually much like an energetic mike coil. For decades, active microphones have already been sent with the style coil attached to the primary of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's case is usually attached to the cable shield, which will be connected to the microphone amplifier's soil (see Rane's website for more discussion).
By and large, active microphones are very calm units as a result of the combination of transformer isolation and balanced, flying indication lines during, along with shielded, humbucking coils.
Therefore why not guitars? Instruments are once plagued by noise. Humbucking pickups are only a partial (though essential!) solution. The obvious solution would be to float your guitar pickup to a balanced output, as being a microphone. The same strategy was printed this 2001 patent software such as Takamine Jasmine S35?