Yamaha Keyboard Pedal A electric guitar pickup is actually much like a powerful microphone coil. For many years, powerful microphones have already been sent with the voice coil attached with the principal of the microphone's transformer, and maybe not referenced to floor (‘floating'). The microphone's case is normally attached to the cable shield, which will be attached to the microphone amplifier's ground (see Rane's site for more discussion).
By and large, dynamic microphones are very calm units consequently of the combination of transformer solitude and balanced, flying indication lines for the duration of, along with guarded, humbucking coils.
So why don't you instruments? Guitars are once affected by noise. Humbucking pickups are merely a partial (though crucial!) solution. Well-known solution is to float the guitar collection to a balanced output, just like a microphone. A similar idea was published that 2001 patent application like this Yamaha Keyboard Pedal?