Keyboard Music Stand A best guitar pickup is essentially similar to an energetic microphone coil. For decades, active microphones have already been sent with the style coil attached with the principal of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's situation is normally connected to the cable guard, which is connected to the mike amplifier's floor (see Rane's site for more discussion).
By and large, energetic microphones are very quiet products consequently of the combination of transformer isolation and balanced, hanging transmission lines through the duration of, along with guarded, humbucking coils.
Therefore why not instruments? Guitars are once affected by noise. Humbucking pickups are merely a partial (though essential!) solution. Well-known alternative is to float the guitar collection to a healthy result, just like a microphone. The same idea was printed this 2001 patent application like this Keyboard Music Stand?