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Showing posts from December, 2021

What is Opto-coupler?

  Ø   Opto-coupler is an electronic component that transfers electrical signals from one circuit to another circuit with isolation Ø   These are also known as Opto-isolator, photo coupler, and optical isolator     Uses Ø   Isolation between circuits Ø   It prevents damage in one circuit due to damage in another circuit Ø   Prevention of unwanted noise Ø   Both circuits can work on different voltage levels   Opto-coupler: PC 817 Ø   It has four pins Ø   Pin-1 is Anode & 2 is Cathode of the LED Ø   Pin-3 is Emitter & 4 is Collector of the Photo Transistor Ø   When light of LED falls on the Phototransistor base it conducts Ø   If there is fault in either circuit, another circuit will remain safe Ø   This is 4 pins opto-coupler component Ø   Pin-1 is Anode & 2 is Cathode of the LED Ø   Pin-3 is Emitter & 4 is Collector of the Photo Transistor Ø ...