Apple Wired Aluminum Keyboard A electric guitar pickup is actually just like a dynamic mike coil. For many years, energetic microphones have been wired with the style coil mounted on the primary of the microphone's transformer, and perhaps not recommended to surface (‘floating'). The microphone's situation is usually connected to the wire shield, which will be linked to the mike amplifier's floor (see Rane's site for more discussion).
By and large, active microphones are very calm products as a result of the combination of transformer isolation and healthy, suspended indication lines during, in addition to protected, humbucking coils.
So why don't you instruments? Instruments are once plagued by noise. Humbucking pickups are merely an incomplete (though important!) solution. The obvious solution would be to move your guitar pickup to a balanced result, as being a microphone. The same strategy was published that 2001 patent application such as Apple Wired Aluminum Keyboard?