Piano Digital Yamaha Dgx 630 A best guitar pickup is basically much like a powerful microphone coil. For many years, active microphones have now been sent with the voice coil attached to the primary of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's event is typically linked to the wire shield, which is attached to the microphone amplifier's floor (see Rane's website for more discussion).
By and big, active microphones are extremely calm products consequently of the mix of transformer isolation and healthy, hanging transmission lines during, as well as protected, humbucking coils.
So why don't you instruments? Instruments are once overwhelmed by noise. Humbucking pickups are only a partial (though important!) solution. The most obvious answer is always to float your guitar pickup to a balanced result, being a microphone. An identical idea was published this 2001 patent program like this Piano Digital Yamaha Dgx 630?