CHAPTER 12
MICROPHONES AND DIRECT BOXES
Microphones convert acoustical energy into electrical energy.
TYPES OF MICROPHONES 
A dynamic microphone has a diaphragm in a strong magnetic field. Sound waves that strike the surface of the microphone cause the coil to move in the magnetic field. The movement generates a voltage that corresponds to the sound pressure on the surface of the diaphragm.
A condenser microphone (Figure 12–1) involves electrostatic principles rather than the electromagnetic principles of a dynamic microphone. A condenser microphone has a diaphragm placed adjacent to a backplate, and capacitance varies with sound pressure. Condenser ...
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