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Optocoupler is an electrical optical electrical converter device that transmits electrical signals with light as the medium, which is referred to as optocoupler for short. It consists of a light source and a light receiver. The light source and the light receiver are assembled in the same closed shell and isolated from each other with transparent insulator. The pin of the light-emitting source is the input end, the pin of the light receiver is the output end, the common light-emitting source is the light-emitting diode, and the light receiver is the photodiode, photosensitive triode, etc.

For the switching circuit, it is often required to have a good electrical isolation between the control circuit and the switching circuit, which is difficult for the general electronic switch, but it is easy to realize by using the optocoupler.


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