Bass Drum Head Hole A best guitar pickup is basically just like a vibrant microphone coil. For decades, active microphones have now been sent with the voice coil attached with the primary of the microphone's transformer, and perhaps not introduced to soil (‘floating'). The microphone's case is typically linked to the cable guard, that will be connected to the microphone amplifier's soil (see Rane's website for more discussion).
By and big, dynamic microphones are extremely quiet devices as a result of the mix of transformer isolation and healthy, suspended transmission lines throughout, along with protected, humbucking coils.
Therefore why don't you instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are only a partial (though essential!) solution. Well-known alternative is always to float the guitar collection to a balanced production, as being a microphone. An identical idea was published that 2001 patent program like this Bass Drum Head Hole?