Working principle of rack-mounted optocouplers

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An optocoupler moves signals between two circuits using light instead of electricity. That way, the input and output stay electrically separate; there is no direct connection, just light doing the job. Unlike transformers or capacitors, which can only transfer AC signals across the isolation barrier, optocouplers can. Photocouplers (also known as optocouplers) generate light by using a light-emitting diode (LED) to generate a current which is conducted through a phototransistor. Internal Equivalence Circuit Here, we will describe how a general-purpose photocoupler with this basic structure is used.

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