Latest Casio Digital Piano A best guitar pickup is basically similar to a vibrant mike coil. For decades, powerful microphones have now been sent with the voice coil attached with the principal of the microphone's transformer, and maybe not introduced to soil (‘floating'). The microphone's situation is typically linked to the cable guard, which will be linked to the mike amplifier's floor (see Rane's site for more discussion).
By and big, dynamic microphones are extremely quiet devices consequently of the combination of transformer isolation and healthy, flying sign lines throughout, as well as protected, humbucking coils.
Therefore why not guitars? Instruments are once affected by noise. Humbucking pickups are only a partial (though crucial!) solution. The most obvious solution is to move your guitar pickup to a balanced production, being a microphone. An identical idea was printed this 2001 patent program such as Latest Casio Digital Piano?