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 Mark on top-left, shows that pin counting starts from here

Ø SMD version is also available in markets

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