{762} Very Simple Optocoupler Testing, Opto-Isolator Test 

in this video number {762} i explained what is optocoupler opto-isolator and demonstrated Very Simple Optocoupler Testing of pc817. in this Opto-Isolator Test i used a multimeter and a 1.5 volt battery cell. how to check optocoupler.
#howto #test #optocoupler
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