Beginning Classical Guitar A electric guitar pickup is actually similar to a vibrant mike coil. For many years, active microphones have been wired with the voice coil mounted on the principal of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's case is normally linked to the wire shield, which will be attached to the mike amplifier's soil (see Rane's website for more discussion).
By and big, vibrant microphones are very calm devices as a result of the mixture of transformer solitude and healthy, hanging sign lines all through, in addition to guarded, humbucking coils.
So why not instruments? Guitars are notoriously plagued by noise. Humbucking pickups are only a partial (though essential!) solution. The most obvious alternative would be to move your guitar pickup to a healthy productivity, being a microphone. A similar idea was published this 2001 patent application like this Beginning Classical Guitar?