Robin Trower Music A guitar pickup is basically similar to a powerful microphone coil. For many years, powerful microphones have been wired with the style coil attached to the principal of the microphone's transformer, and maybe not introduced to surface (‘floating'). The microphone's case is typically attached to the wire shield, that will be connected to the microphone amplifier's ground (see Rane's web site for more discussion).
By and big, dynamic microphones are very quiet products consequently of the combination of transformer isolation and balanced, flying indication lines through the duration of, as well as protected, humbucking coils.
Therefore why not instruments? Instruments are once overwhelmed by noise. Humbucking pickups are only an incomplete (though important!) solution. Well-known alternative is to float your guitar collection to a healthy result, as being a microphone. A similar idea was printed that 2001 patent software like this Robin Trower Music?