Miroslav Philharmonik 2 A guitar pickup is basically similar to a vibrant microphone coil. For decades, active microphones have already been sent with the voice coil attached with the principal of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's situation is typically connected to the wire guard, that will be attached to the microphone amplifier's floor (see Rane's website for more discussion).
By and large, active microphones are very quiet units consequently of the combination of transformer solitude and healthy, flying transmission lines throughout, as well as guarded, humbucking coils.
So why don't you instruments? Guitars are once plagued by noise. Humbucking pickups are only a partial (though essential!) solution. Well-known alternative would be to move practicing the guitar collection to a balanced output, being a microphone. A similar idea was printed that 2001 patent program like this Miroslav Philharmonik 2?