Audio Technica Wireless Mic A guitar collection is essentially similar to a powerful microphone coil. For decades, active microphones have already been sent with the voice coil mounted on the primary of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's event is typically connected to the cable guard, that is linked to the mike amplifier's floor (see Rane's website for more discussion).
By and big, dynamic microphones are very calm devices consequently of the combination of transformer isolation and healthy, suspended indication lines all through, in addition to shielded, humbucking coils.
So why don't you instruments? Instruments are notoriously affected by noise. Humbucking pickups are merely an incomplete (though crucial!) solution. The most obvious option is to float your guitar pickup to a healthy production, being a microphone. An identical idea was printed this 2001 patent software such as Audio Technica Wireless Mic?