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An optocoupler is a semiconductor device, an electronic component that transfers electrical signals between two isolated circuits by using light. Optocouplers prevent high voltages from affecting the electronic system receiving the signal. These are also known as opto-isolator, photocoupler, or optical-isolator. Two parts are used in an optocoupler: an LED that emits infrared light and a photosensitive device that detects light from the LED.

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