Eric Clapton I Still Do A electric guitar collection is actually much like a powerful mike coil. For decades, dynamic microphones have been wired with the style coil attached with the primary of the microphone's transformer, and maybe not introduced to soil (‘floating'). The microphone's situation is typically connected to the cable guard, which is connected to the microphone amplifier's ground (see Rane's website for more discussion).
By and big, energetic microphones are extremely quiet devices as a result of the mixture of transformer isolation and balanced, floating indication lines throughout, in addition to guarded, humbucking coils.
So why don't you instruments? Guitars are once affected by noise. Humbucking pickups are merely a partial (though essential!) solution. The obvious answer is always to float the guitar pickup to a balanced production, as being a microphone. An identical strategy was printed this 2001 patent software such as Eric Clapton I Still Do?