Little Bone Fret File A best guitar pickup is basically much like a powerful mike coil. For decades, active microphones have now been wired with the voice coil mounted on the principal of the microphone's transformer, and not introduced to soil (‘floating'). The microphone's case is usually attached to the wire shield, that will be connected to the microphone amplifier's surface (see Rane's website for more discussion).
By and large, vibrant microphones are extremely quiet products as a result of the mix of transformer solitude and balanced, flying transmission lines through the duration of, in addition to guarded, humbucking coils.
So why not instruments? Guitars are notoriously plagued by noise. Humbucking pickups are merely an incomplete (though important!) solution. The most obvious alternative would be to float practicing the guitar pickup to a balanced result, just like a microphone. The same idea was printed that 2001 patent application like this Little Bone Fret File?