Guitar Center Pedal Power Supply A guitar pickup is actually just like an energetic microphone coil. For decades, energetic microphones have now been sent with the voice coil attached to the principal of the microphone's transformer, and not called to floor (‘floating'). The microphone's event is usually connected to the cable guard, which will be attached to the microphone amplifier's ground (see Rane's web site for more discussion).
By and large, energetic microphones are very calm devices as a result of the mix of transformer solitude and healthy, hanging transmission lines throughout, in addition to shielded, humbucking coils.
So why not instruments? Instruments are notoriously affected by noise. Humbucking pickups are only an incomplete (though essential!) solution. The most obvious solution is always to move the guitar pickup to a healthy output, being a microphone. A similar thought was published this 2001 patent application such as Guitar Center Pedal Power Supply?