Simmons Sd5k Electronic Drum Set A electric guitar pickup is essentially much like an energetic microphone coil. For decades, energetic microphones have been wired with the style coil mounted on the principal of the microphone's transformer, and not referenced to surface (‘floating'). The microphone's event is usually linked to the wire shield, which can be attached to the mike amplifier's ground (see Rane's website for more discussion).
By and large, vibrant microphones are extremely quiet units consequently of the combination of transformer isolation and balanced, hanging transmission lines during, in addition to protected, humbucking coils.
Therefore why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are just a partial (though important!) solution. The obvious solution is to float practicing the guitar collection to a healthy result, being a microphone. The same idea was printed this 2001 patent software like this Simmons Sd5k Electronic Drum Set?