Trumpets For Sale A guitar collection is essentially similar to a dynamic microphone coil. For decades, powerful microphones have been sent with the voice coil attached to the primary of the microphone's transformer, and not introduced to surface (‘floating'). The microphone's event is typically linked to the cable shield, that is linked to the microphone amplifier's surface (see Rane's internet site for more discussion).
By and large, active microphones are very quiet devices consequently of the combination of transformer isolation and balanced, hanging sign lines during, in addition to guarded, humbucking coils.
So why not instruments? Instruments are once plagued by noise. Humbucking pickups are merely an incomplete (though essential!) solution. The most obvious alternative would be to float your guitar collection to a healthy output, just like a microphone. The same strategy was published this 2001 patent application like this Trumpets For Sale?