Turner 99 D Cardioid
This 99D rugged microphone is popular when the
program calls for close-up talking or a windy
outdoor location. Velocity ribbon microphones
could easily be damaged from either environment
while dynamic microphones are quite durable.
Dynamic mics have a moveable coil that are
driven by the air pressure on the diaphragms.
The movement of the coil over the pole-piece of
the magnet causes a small voltage to be
generated across the coil. A transformer amplifies
this voltage and provides impedence matching.