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You can build a simple circuit - bias the led and measure the transistor when LED is ON and OFF. If it is an open or gapped opto-coupler you can even try to introduce an obstacle and to see how the output changes.
You can build a simple circuit - bias the led and measure the transistor when LED is ON and OFF. If it is an open or gapped opto-coupler you can even try to introduce an obstacle and to see how the output changes.
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