Yamaha Foot Pedal A electric guitar pickup is essentially similar to a vibrant microphone coil. For decades, active microphones have now been wired with the style coil mounted on the principal of the microphone's transformer, and not called to surface (‘floating'). The microphone's case is typically attached to the wire guard, that is attached to the microphone amplifier's ground (see Rane's internet site for more discussion).
By and large, vibrant microphones are extremely quiet products consequently of the combination of transformer isolation and balanced, suspended sign lines during, along with protected, humbucking coils.
So why don't you guitars? Instruments are once affected by noise. Humbucking pickups are merely an incomplete (though essential!) solution. The most obvious solution is always to move practicing the guitar collection to a balanced production, just like a microphone. The same idea was printed that 2001 patent application like this Yamaha Foot Pedal?