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Optocoupler
f-alpha.net » Electronics » Optoelectronics » Optocoupler » Let's go... » Experiment 1 - Optocoupler

Experiment 1 - The Optocoupler

You connect the internal LED of the PC817 optocoupler using pin 1 (anode) and 2 (cathode)...

You connect the internal phototransistor of the PC817 using pin 3 (emitter) and 4 (collector)...

This results in the circuit shown...

Circuit optocoupler. (Enlarge)

Circuit diagram optocoupler.

On pressing the pushbutton switch S1, LED1 lights up. On releasing S1, LED1 turns off.

Inside the optocoupler, the internal LED lights up upon pressing S1 The light shines internally onto the phototransistor, which turns on.

However, you will not find this circuit in practice...

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