Telefunken Elam 251 A electric guitar collection is essentially just like an energetic microphone coil. For many years, active microphones have already been wired with the style coil mounted on the primary of the microphone's transformer, and not referenced to surface (‘floating'). The microphone's event is usually attached to the wire guard, which is connected to the mike amplifier's soil (see Rane's web site for more discussion).
By and large, active microphones are very quiet products consequently of the combination of transformer isolation and balanced, suspended sign lines for the duration of, in addition to guarded, humbucking coils.
Therefore why not instruments? Guitars are notoriously plagued by noise. Humbucking pickups are just an incomplete (though important!) solution. The most obvious alternative is to float your guitar pickup to a healthy productivity, as being a microphone. The same idea was published that 2001 patent program like this Telefunken Elam 251?