- A vibrating membrane in a speaker. It produces a sound wave output in response to its electric input. Cones and domes are examples of commonly utilized diaphragms in speakers. Also called speaker diaphragm, or loudspeaker diaphragm.
- A vibrating membrane in a microphone. It produces an electric output in response to its sound-wave input. Also called microphone diaphragm.
- A pressure-sensitive element in some sensors, such as certain barometers.
- A membrane, disk, adjustable opening, or other device or mechanism which serves to restrict or regulate the passage of a waves and/or matter, such as light waves or electrolytes.
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