Power Ampli Mini Tda 2030 A electric guitar pickup is essentially similar to a dynamic mike coil. For decades, energetic microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and not recommended to floor (‘floating'). The microphone's situation is typically linked to the cable shield, that is linked to the mike amplifier's floor (see Rane's web site for more discussion).
By and large, powerful microphones are extremely quiet products consequently of the mixture of transformer isolation and balanced, flying sign lines throughout, in addition to protected, humbucking coils.
So why not instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are merely a partial (though crucial!) solution. The most obvious solution is to move your guitar collection to a balanced result, being a microphone. A similar idea was printed that 2001 patent application like this Power Ampli Mini Tda 2030?