Grover Rotomatic Tuners A best guitar collection is basically similar to a powerful mike coil. For decades, dynamic microphones have now been sent with the voice coil mounted on the primary of the microphone's transformer, and maybe not recommended to soil (‘floating'). The microphone's case is usually connected to the cable guard, which can be linked to the mike amplifier's floor (see Rane's website for more discussion).
By and big, active microphones are very quiet units as a result of the mix of transformer solitude and healthy, flying transmission lines all through, in addition to protected, humbucking coils.
Therefore why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are only a partial (though important!) solution. Well-known answer is always to float your guitar pickup to a balanced productivity, being a microphone. The same thought was published this 2001 patent application like this Grover Rotomatic Tuners?