Optocoupler. In this video we learn how optocouplers work and also look at some simple electron circuits you can make yourself to understand how an optocoupler, opto-isolator, phototransistor, photocoupler works. Photo transistor
Correction
13:21 Upper text "220Ω" resistor should say "22Ω" calculation in lower screen is correct
0:38 Pin bottom right should be "3 Emitter" pin top right should read "4 Collector" numbering is wrong, wording is correct. Audio also contains error.
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