The Song Trouble A guitar collection is basically just like a dynamic microphone coil. For many years, vibrant microphones have now been sent with the style coil mounted on the principal of the microphone's transformer, and not referenced to floor (‘floating'). The microphone's case is usually attached to the wire shield, which can be linked to the microphone amplifier's surface (see Rane's site for more discussion).
By and big, active microphones are extremely calm products as a result of the mix of transformer isolation and healthy, flying transmission lines throughout, in addition to protected, humbucking coils.
So why not instruments? Guitars are notoriously affected by noise. Humbucking pickups are merely an incomplete (though crucial!) solution. The most obvious solution is to float your guitar pickup to a healthy output, being a microphone. A similar strategy was printed that 2001 patent application like this The Song Trouble?