Casio Privia Keyboard A best guitar pickup is actually just like a vibrant microphone coil. For many years, powerful microphones have already been wired with the voice coil attached with the principal of the microphone's transformer, and not recommended to soil (‘floating'). The microphone's situation is typically connected to the cable guard, that will be linked to the mike amplifier's ground (see Rane's web site for more discussion).
By and big, energetic microphones are very calm devices as a result of the combination of transformer isolation and balanced, hanging indication lines during, as well as shielded, humbucking coils.
Therefore why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are merely an incomplete (though crucial!) solution. Well-known answer would be to move your guitar pickup to a balanced production, just like a microphone. The same idea was printed this 2001 patent software such as Casio Privia Keyboard?