Jerry Reed Guitar A electric guitar pickup is actually just like a dynamic mike coil. For decades, energetic microphones have been wired with the voice coil attached with the primary of the microphone's transformer, and perhaps not introduced to soil (‘floating'). The microphone's situation is typically attached to the cable guard, which will be attached to the mike amplifier's soil (see Rane's site for more discussion).
By and big, vibrant microphones are very quiet units consequently of the mix of transformer solitude and balanced, flying sign lines throughout, as well as protected, humbucking coils.
Therefore why don't you instruments? Instruments are once plagued by noise. Humbucking pickups are only a partial (though crucial!) solution. Well-known answer is to move the guitar pickup to a balanced output, just like a microphone. A similar thought was published that 2001 patent application like this Jerry Reed Guitar?