Midi Keyboard With Weighted Keys A guitar pickup is actually similar to an energetic microphone coil. For many years, dynamic microphones have now been sent with the voice coil mounted on the primary of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's event is typically attached to the cable guard, that will be attached to the microphone amplifier's soil (see Rane's site for more discussion).
By and big, vibrant microphones are extremely calm units consequently of the combination of transformer isolation and healthy, suspended sign lines all through, along with shielded, humbucking coils.
Therefore why not instruments? Guitars are once plagued by noise. Humbucking pickups are only an incomplete (though important!) solution. The most obvious solution is to move practicing the guitar collection to a balanced output, just like a microphone. The same thought was published that 2001 patent request like this Midi Keyboard With Weighted Keys?