Chinese Handwriting Keyboard Samsung A guitar collection is basically similar to a powerful mike coil. For decades, powerful microphones have been wired with the voice coil attached to the primary of the microphone's transformer, and maybe not referenced to surface (‘floating'). The microphone's case is usually attached to the cable guard, that will be connected to the microphone amplifier's floor (see Rane's web site for more discussion).
By and large, active microphones are extremely calm units consequently of the combination of transformer isolation and healthy, suspended indication lines throughout, in addition to shielded, humbucking coils.
So why not guitars? Guitars are notoriously overwhelmed by noise. Humbucking pickups are only a partial (though important!) solution. Well-known alternative is to float practicing the guitar collection to a balanced output, just like a microphone. A similar idea was printed that 2001 patent request such as Chinese Handwriting Keyboard Samsung?