Best Quiet Wired Keyboard A guitar pickup is actually just like a dynamic mike coil. For many years, powerful microphones have now been wired with the voice coil attached to the principal of the microphone's transformer, and maybe not called to surface (‘floating'). The microphone's situation is typically attached to the cable guard, that will be attached to the mike amplifier's soil (see Rane's website for more discussion).
By and large, dynamic microphones are very calm units consequently of the mixture of transformer isolation and balanced, hanging indication lines throughout, along with shielded, humbucking coils.
So why not guitars? Instruments are notoriously affected by noise. Humbucking pickups are just an incomplete (though essential!) solution. Well-known answer is to move your guitar collection to a healthy output, being a microphone. The same idea was printed that 2001 patent application like this Best Quiet Wired Keyboard?