Celestion Alnico Cream A electric guitar pickup is actually similar to a powerful microphone coil. For decades, energetic microphones have now been wired with the voice coil attached with the primary of the microphone's transformer, and perhaps not called to floor (‘floating'). The microphone's event is typically attached to the wire shield, which can be linked to the microphone amplifier's ground (see Rane's website for more discussion).
By and large, energetic microphones are very calm units as a result of the mix of transformer isolation and balanced, floating sign lines through the duration of, in addition to shielded, humbucking coils.
So why not instruments? Instruments are notoriously affected by noise. Humbucking pickups are just an incomplete (though crucial!) solution. The most obvious answer would be to move the guitar pickup to a balanced result, as being a microphone. A similar strategy was published this 2001 patent application like this Celestion Alnico Cream?