Wired Keyboard Nz A guitar pickup is essentially similar to an energetic mike coil. For many years, dynamic microphones have been sent with the voice coil mounted on the primary of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's case is typically attached to the cable shield, which can be attached to the mike amplifier's floor (see Rane's web site for more discussion).
By and big, powerful microphones are very quiet devices consequently of the combination of transformer isolation and balanced, flying sign lines through the duration of, along with protected, humbucking coils.
So why not instruments? Instruments are once affected by noise. Humbucking pickups are merely an incomplete (though essential!) solution. Well-known solution would be to float your guitar pickup to a healthy result, as being a microphone. A similar strategy was published this 2001 patent request such as Wired Keyboard Nz?