Acoustic Guitar Cases A guitar pickup is basically similar to a powerful microphone coil. For decades, energetic microphones have already been wired with the voice coil attached with the principal of the microphone's transformer, and not introduced to floor (‘floating'). The microphone's case is typically linked to the wire shield, that is linked to the microphone amplifier's floor (see Rane's website for more discussion).
By and big, dynamic microphones are very calm devices consequently of the mix of transformer isolation and balanced, floating transmission lines for the duration of, as well as shielded, humbucking coils.
Therefore why not instruments? Instruments are once affected by noise. Humbucking pickups are only a partial (though crucial!) solution. The most obvious alternative is always to float your guitar collection to a balanced result, being a microphone. A similar strategy was published that 2001 patent program such as Acoustic Guitar Cases?