Touch Keyboard Handwriting Panel Service A electric guitar pickup is actually similar to a powerful mike coil. For decades, active microphones have been wired with the style coil attached to the primary of the microphone's transformer, and maybe not recommended to ground (‘floating'). The microphone's case is normally linked to the wire guard, which will be linked to the mike amplifier's ground (see Rane's site for more discussion).
By and large, energetic microphones are very quiet devices consequently of the combination of transformer isolation and healthy, flying indication lines all through, along with protected, humbucking coils.
So why don't you instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are only a partial (though important!) solution. The obvious alternative would be to float the guitar pickup to a healthy result, being a microphone. The same strategy was printed that 2001 patent application such as Touch Keyboard Handwriting Panel Service?