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Emitter may refer to:
Devices which emit charged particles:
- Cathode, or positive electrode, in a vacuum tube or diode
- Anode, or negative electrode, in certain applications based on the emission of ions from a solid surface
- One of the three terminals of a bipolar transistor
Devices which emit electromagnetic radiation:
- Lambertian emitter, a light source whose radiance varies with angle according to Lambert's cosine law
- An infrared LED used to emulate a remote control
- Emitter, a device used in drip irrigation
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