Proco Rat Pedal A best guitar pickup is basically much like an energetic mike coil. For decades, dynamic microphones have already been sent with the voice coil mounted on the primary of the microphone's transformer, and perhaps not called to ground (‘floating'). The microphone's situation is usually connected to the cable shield, which will be attached to the microphone amplifier's ground (see Rane's site for more discussion).
By and big, energetic microphones are very quiet devices as a result of the mixture of transformer isolation and healthy, floating sign lines for the duration of, in addition to guarded, humbucking coils.
So why not guitars? Instruments are notoriously plagued by noise. Humbucking pickups are just an incomplete (though important!) solution. The obvious option is to float practicing the guitar collection to a healthy productivity, just like a microphone. An identical strategy was printed this 2001 patent request like this Proco Rat Pedal?