Mxr Bass Di A electric guitar pickup is actually just like a vibrant mike coil. For decades, dynamic microphones have already been wired with the voice coil attached with the primary of the microphone's transformer, and maybe not called to floor (‘floating'). The microphone's case is typically attached to the wire guard, which will be connected to the microphone amplifier's soil (see Rane's website for more discussion).
By and big, powerful microphones are extremely calm devices as a result of the mixture of transformer isolation and balanced, suspended transmission lines all through, along with protected, humbucking coils.
So why don't you instruments? Guitars are notoriously affected by noise. Humbucking pickups are only an incomplete (though essential!) solution. Well-known option is to move the guitar pickup to a healthy output, being a microphone. An identical thought was published this 2001 patent request like this Mxr Bass Di?