Casio Upright Digital Piano A best guitar pickup is basically similar to a powerful microphone coil. For decades, vibrant microphones have already been wired with the style coil attached with the principal of the microphone's transformer, and perhaps not introduced to ground (‘floating'). The microphone's situation is usually connected to the wire guard, which can be connected to the mike amplifier's floor (see Rane's web site for more discussion).
By and big, vibrant microphones are extremely quiet products as a result of the mix of transformer solitude and healthy, hanging transmission lines for the duration of, along with guarded, humbucking coils.
So why don't you instruments? Instruments are once affected by noise. Humbucking pickups are only a partial (though essential!) solution. Well-known option is always to move your guitar pickup to a balanced production, just like a microphone. The same idea was printed that 2001 patent application like this Casio Upright Digital Piano?