Guitar Pedal Equalizer A guitar pickup is actually similar to a dynamic microphone coil. For many years, powerful microphones have been wired with the voice coil attached to the primary of the microphone's transformer, and maybe not referenced to ground (‘floating'). The microphone's situation is usually connected to the wire shield, which can be attached to the microphone amplifier's surface (see Rane's internet site for more discussion).
By and large, powerful microphones are extremely calm devices consequently of the mix of transformer isolation and balanced, suspended sign lines all through, along with guarded, humbucking coils.
Therefore why don't you instruments? Guitars are notoriously affected by noise. Humbucking pickups are just an incomplete (though essential!) solution. The obvious answer would be to float your guitar collection to a balanced output, being a microphone. An identical idea was printed this 2001 patent application such as Guitar Pedal Equalizer?