Acoustic Guitar Microphone A electric guitar pickup is actually just like a dynamic mike coil. For decades, active microphones have now been wired with the voice coil mounted on the primary of the microphone's transformer, and not recommended to soil (‘floating'). The microphone's event is usually linked to the wire shield, which is attached to the microphone amplifier's surface (see Rane's site for more discussion).
By and big, powerful microphones are very calm products as a result of the mixture of transformer isolation and healthy, hanging indication lines all through, as well as protected, humbucking coils.
So why not instruments? Instruments are notoriously affected by noise. Humbucking pickups are merely a partial (though crucial!) solution. The obvious solution is to float the guitar collection to a healthy production, being a microphone. The same strategy was published this 2001 patent software like this Acoustic Guitar Microphone?