ABSTRACT
Phantom powering is a commonly encountered method of providing power to an audio circuit such as a microphone or DI box. Transducers come in a wide variety across many application areas. An audio amplifier needs to be able to amplify the positive and negative portions of an audio signal equally well. A moving coil loudspeaker can be thought of as a resistor and an inductor in series. In common with dynamic microphones and moving coil loudspeakers, coil pickups operate on the principle of electromagnetic induction. Piezoelectric material has a very simple, very useful two-way behaviour. A spring reverb pan is not strictly speaking a transducer; it takes as its input an electrical signal and produces as its output another electrical signal.
