Bottle Neck Slides A guitar pickup is actually just like a powerful mike coil. For decades, energetic microphones have been sent with the style coil attached with the principal of the microphone's transformer, and maybe not called to surface (‘floating'). The microphone's situation is usually linked to the cable shield, which will be connected to the mike amplifier's soil (see Rane's site for more discussion).
By and big, dynamic microphones are very quiet devices as a result of the combination of transformer solitude and balanced, hanging sign lines throughout, along with shielded, humbucking coils.
Therefore why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are merely a partial (though crucial!) solution. Well-known answer is to move the guitar pickup to a healthy production, as being a microphone. A similar strategy was published this 2001 patent program like this Bottle Neck Slides?