At2020 Mic Stand A electric guitar collection is essentially much like a powerful microphone coil. For many years, active microphones have now been sent with the voice coil attached to the primary of the microphone's transformer, and maybe not called to surface (‘floating'). The microphone's case is normally linked to the wire shield, that is linked to the mike amplifier's ground (see Rane's site for more discussion).
By and big, vibrant microphones are extremely quiet devices as a result of the combination of transformer isolation and healthy, flying sign lines during, in addition to protected, humbucking coils.
So why don't you instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are just an incomplete (though crucial!) solution. Well-known solution would be to float the guitar collection to a healthy output, as being a microphone. An identical strategy was printed that 2001 patent program like this At2020 Mic Stand?