Electronic Drum Trigger Pad A guitar pickup is essentially just like a dynamic microphone coil. For decades, active microphones have now 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 case is typically connected to the wire guard, that will be connected to the mike amplifier's floor (see Rane's website for more discussion).
By and big, active microphones are very quiet products as a result of the combination of transformer isolation and balanced, flying sign lines through the duration of, along with shielded, humbucking coils.
So why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are just a partial (though important!) solution. The most obvious option is always to move practicing the guitar pickup to a balanced result, as being a microphone. The same strategy was printed that 2001 patent application such as Electronic Drum Trigger Pad?