Mini Hand Truck A electric guitar pickup is essentially much like an energetic mike coil. For many years, energetic microphones have already been wired with the voice coil attached to the principal of the microphone's transformer, and not referenced to surface (‘floating'). The microphone's event is typically linked to the cable shield, which will be connected to the mike amplifier's ground (see Rane's internet site for more discussion).
By and big, energetic microphones are very quiet products as a result of the mixture of transformer isolation and balanced, flying indication lines throughout, as well as shielded, humbucking coils.
Therefore why don't you instruments? Instruments are once plagued by noise. Humbucking pickups are merely a partial (though important!) solution. Well-known option is to float the guitar collection to a balanced output, as being a microphone. A similar strategy was published this 2001 patent application such as Mini Hand Truck?