Samson Synth 7 A best guitar pickup is essentially similar to a dynamic mike coil. For decades, active microphones have already been sent with the voice coil attached to the primary of the microphone's transformer, and maybe not recommended to soil (‘floating'). The microphone's case is usually linked to the wire guard, that will be attached to the microphone amplifier's floor (see Rane's site for more discussion).
By and large, vibrant microphones are very calm products as a result of the combination of transformer isolation and healthy, flying transmission lines for the duration of, in addition to shielded, humbucking coils.
So why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are only a partial (though crucial!) solution. Well-known answer is to float practicing the guitar collection to a healthy result, as being a microphone. An identical idea was printed this 2001 patent application such as Samson Synth 7?