Eric Clapton Autographs A electric guitar collection is basically similar to a dynamic microphone coil. For many years, powerful microphones have now been wired with the voice coil attached to the primary of the microphone's transformer, and maybe not introduced to surface (‘floating'). The microphone's case is typically attached to the wire guard, that will be connected to the microphone amplifier's surface (see Rane's site for more discussion).
By and large, active microphones are extremely quiet units as a result of the mix of transformer solitude and balanced, floating indication lines through the duration of, along with protected, humbucking coils.
So why not instruments? Guitars are once plagued by noise. Humbucking pickups are just an incomplete (though important!) solution. The obvious alternative would be to float practicing the guitar pickup to a balanced result, being a microphone. A similar idea was printed this 2001 patent application like this Eric Clapton Autographs?