Guitar String Differences A best guitar pickup is actually similar to an energetic mike coil. For many years, vibrant microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and maybe not referenced to ground (‘floating'). The microphone's case is typically attached to the cable shield, which is linked to the mike amplifier's floor (see Rane's site for more discussion).
By and big, powerful microphones are very quiet units as a result of the mixture of transformer solitude and healthy, floating transmission lines throughout, in addition to guarded, humbucking coils.
Therefore why not instruments? Instruments are notoriously affected by noise. Humbucking pickups are merely an incomplete (though crucial!) solution. Well-known answer is to float the guitar pickup to a balanced output, just like a microphone. The same strategy was printed that 2001 patent request like this Guitar String Differences?