Receivers {microphone}| can change sound to electric current. In some microphones {ceramic microphone}, sound pressure makes voltage in a crystal {piezoelectric effect}. In some microphones {dynamic microphone}, sound pressure moves a magnet unidirectionally or omnidirectionally in a magnetic field.
Practical Affairs>Machine>Kinds>Electronic>Sound
7-Machine-Kinds-Electronic-Sound
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Date Modified: 2022.0224