Evans Drum Head Chart A electric guitar pickup is basically similar to a dynamic mike coil. For many years, powerful microphones have been sent with the voice coil attached to the primary of the microphone's transformer, and maybe not recommended to floor (‘floating'). The microphone's event is usually attached to the wire guard, which is connected to the microphone amplifier's floor (see Rane's site for more discussion).
By and large, active microphones are extremely calm units as a result of the mix of transformer isolation and balanced, hanging indication lines throughout, in addition to shielded, humbucking coils.
Therefore why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are merely an incomplete (though crucial!) solution. Well-known answer would be to float practicing the guitar collection to a balanced production, being a microphone. A similar idea was published this 2001 patent application such as Evans Drum Head Chart?