Chris Stapleton Live A best guitar pickup is essentially just like a dynamic mike coil. For many years, vibrant microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and maybe not introduced to surface (‘floating'). The microphone's situation is typically linked to the cable guard, that will be connected to the mike amplifier's ground (see Rane's website for more discussion).
By and big, dynamic microphones are very calm products as a result of the mix of transformer isolation and healthy, flying transmission lines throughout, along with shielded, humbucking coils.
Therefore why not instruments? Instruments are once affected by noise. Humbucking pickups are only a partial (though important!) solution. The most obvious solution is always to float practicing the guitar collection to a healthy output, just like a microphone. An identical thought was printed this 2001 patent request such as Chris Stapleton Live?