Takamine 12 Cuerdas A electric guitar pickup is essentially much like a dynamic mike coil. For many years, active microphones have already been wired with the style coil attached to the primary of the microphone's transformer, and maybe not recommended to soil (‘floating'). The microphone's case is typically linked to the cable shield, that will be connected to the microphone amplifier's floor (see Rane's web site for more discussion).
By and large, powerful microphones are very quiet units consequently of the combination of transformer solitude and healthy, hanging transmission lines all through, as well as protected, humbucking coils.
Therefore why don't you instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are only an incomplete (though essential!) solution. The most obvious solution is to float the guitar pickup to a healthy result, as being a microphone. A similar idea was printed this 2001 patent software such as Takamine 12 Cuerdas?