Straightpoint Wireless Handheld Plus A best guitar pickup is actually just like an energetic mike coil. For many years, energetic microphones have been wired with the style coil attached with the primary of the microphone's transformer, and maybe not recommended to soil (‘floating'). The microphone's event is typically linked to the cable shield, which is attached to the mike amplifier's surface (see Rane's site for more discussion).
By and large, energetic microphones are extremely quiet units consequently of the mixture of transformer isolation and healthy, floating transmission lines all through, as well as guarded, humbucking coils.
Therefore why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are merely an incomplete (though important!) solution. The obvious option would be to float the guitar pickup to a healthy output, just like a microphone. A similar thought was published that 2001 patent request such as Straightpoint Wireless Handheld Plus?