Fender Duo Sonic 2016 A electric guitar pickup is actually just like a dynamic mike coil. For many years, vibrant microphones have already been sent with the voice coil attached to the primary of the microphone's transformer, and not recommended to floor (‘floating'). The microphone's case is usually linked to the cable guard, which will be attached to the microphone amplifier's ground (see Rane's site for more discussion).
By and big, dynamic microphones are extremely quiet products consequently of the mixture of transformer isolation and healthy, flying sign lines through the duration of, along with shielded, humbucking coils.
So why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are just an incomplete (though crucial!) solution. Well-known solution is always to float the guitar collection to a balanced production, as being a microphone. The same strategy was printed this 2001 patent application such as Fender Duo Sonic 2016?