Stingray Bass Dimensions A guitar pickup is basically much like a vibrant mike coil. For decades, vibrant microphones have been sent with the voice coil attached with the principal of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's case is typically connected to the cable shield, which can be linked to the mike amplifier's floor (see Rane's internet site for more discussion).
By and large, active microphones are very calm products consequently of the mixture of transformer isolation and balanced, suspended indication lines throughout, as well as shielded, humbucking coils.
So why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are only a partial (though essential!) solution. The obvious solution is always to float your guitar collection to a healthy result, just like a microphone. A similar idea was published that 2001 patent request such as Stingray Bass Dimensions?