Aguilar Tone Hammer Pedal A guitar collection is essentially similar to a dynamic microphone coil. For decades, energetic microphones have already been sent with the voice coil attached to the primary of the microphone's transformer, and perhaps not recommended to soil (‘floating'). The microphone's situation is normally linked to the wire shield, which can be connected to the microphone amplifier's ground (see Rane's internet site for more discussion).
By and big, energetic microphones are extremely quiet units consequently of the mix of transformer solitude and balanced, floating sign lines throughout, as well as protected, humbucking coils.
So why don't you instruments? Instruments are notoriously plagued by noise. Humbucking pickups are only a partial (though important!) solution. Well-known solution is always to move the guitar collection to a balanced output, just like a microphone. A similar strategy was published this 2001 patent request like this Aguilar Tone Hammer Pedal?