One Knob Pumper A best guitar pickup is actually just like a dynamic microphone coil. For decades, active microphones have now been wired with the style coil attached with the principal of the microphone's transformer, and not referenced to floor (‘floating'). The microphone's situation is usually linked to the cable shield, which can be linked to the microphone amplifier's floor (see Rane's internet site for more discussion).
By and big, active microphones are extremely calm units as a result of the mixture of transformer isolation and healthy, flying transmission lines through the duration of, along with guarded, humbucking coils.
So why not instruments? Guitars are notoriously plagued by noise. Humbucking pickups are just an incomplete (though essential!) solution. The most obvious alternative is to move your guitar pickup to a balanced output, being a microphone. A similar strategy was printed that 2001 patent request like this One Knob Pumper?