Twins Tickets Today A guitar pickup is actually just like a dynamic mike coil. For decades, active microphones have been sent with the voice coil mounted on the principal of the microphone's transformer, and not called to floor (‘floating'). The microphone's event is normally linked to the cable shield, which is connected to the microphone amplifier's soil (see Rane's web site for more discussion).
By and big, powerful microphones are very quiet products consequently of the mix of transformer isolation and balanced, suspended transmission lines all through, along with shielded, humbucking coils.
Therefore why not instruments? Guitars are notoriously affected by noise. Humbucking pickups are only an incomplete (though important!) solution. Well-known option is to move the guitar collection to a balanced production, just like a microphone. A similar strategy was published this 2001 patent application such as Twins Tickets Today?