Power Amplifier Transformer A electric guitar pickup is basically just like a dynamic mike coil. For decades, energetic microphones have already been wired with the style coil mounted on the primary of the microphone's transformer, and maybe not referenced to floor (‘floating'). The microphone's situation is normally connected to the cable guard, which can be linked to the mike amplifier's surface (see Rane's site for more discussion).
By and large, active microphones are very quiet products as a result of the combination of transformer solitude and healthy, suspended indication lines all through, as well as guarded, humbucking coils.
Therefore why not guitars? Instruments are notoriously affected by noise. Humbucking pickups are merely an incomplete (though important!) solution. Well-known alternative is to move the guitar pickup to a balanced production, just like a microphone. A similar idea was published that 2001 patent request like this Power Amplifier Transformer?