Power Amplifier Zapco A best guitar pickup is basically similar to a vibrant microphone coil. For many years, energetic microphones have been wired with the voice coil attached with the primary of the microphone's transformer, and maybe not referenced to surface (‘floating'). The microphone's event is normally linked to the wire shield, that is linked to the microphone amplifier's ground (see Rane's web site for more discussion).
By and big, active microphones are extremely quiet products as a result of the mix of transformer isolation and healthy, flying transmission lines throughout, along with protected, humbucking coils.
Therefore why don't you guitars? Guitars are notoriously affected by noise. Humbucking pickups are only a partial (though crucial!) solution. The obvious answer is to float practicing the guitar collection to a balanced productivity, being a microphone. A similar strategy was printed this 2001 patent software like this Power Amplifier Zapco?