Dynamic microphones work on the principle of inductance, in which electric current is created, or induced, by a wire or any conductor as it moves within a magnetic field (see Figure 5.2).
Figure 5.2. In this diagram, showing inductance in a dynamic microphone, the magnet, which is attached to the diaphragm, moves through a wire coil, which creates an electrical signal analogous to the original sound wave. Image courtesy of Shure.
There are two types of dynamic microphones, moving coil and ribbon, although when someone refers to a dynamic microphone her or she is usually discussing the more common moving coil variety, which ...