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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Watch these:
Transistors : https://youtu.be/J4oO7PT_nzQ
Diodes: https://youtu.be/Fwj_d3uO5g8​
Capacitor: https://youtu.be/X4EUwTwZ110​
Battery: https://youtu.be/PXNKkcB0pI4​
Voltage regulator: https://youtu.be/d-j0onzzuNQ

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Links - MUST WATCH!!
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ELECTRICAL ENGINEERING
How electricity works: https://youtu.be/mc979OhitAg
Three Phase Electricity: https://youtu.be/4oRT7PoXSS0
How Inverters work: https://youtu.be/ln9VZIL8rVs
How TRANSFORMER works: https://youtu.be/UchitHGF4n8
How 3 Phase electricity works: https://youtu.be/4oRT7PoXSS0
How Induction motor works: https://youtu.be/N7TZ4gm3aUg
What is a KWH: https://youtu.be/SMPhh8gT_1E
How induction motor works: https://youtu.be/N7TZ4gm3aUg

CHILLER ENGINEERING
Chiller Efficiency improvements: https://youtu.be/8x3MiO5XjhY
Chilled water schematics: https://youtu.be/ak51DHAiuWo
Chiller crash course: https://youtu.be/K0xAKzdROEg
Chiller types: https://youtu.be/gYcNDT1d30k
Chillers/AHU/RTU: https://youtu.be/UmWWZdJR1hQ
Water cooled chiller Part1: https://youtu.be/0rzQhSXVq60
Water cooled chiller Part2: https://youtu.be/3ZpE3vCjNqM
Water cooled chiller advanced: https://youtu.be/QlKSGDgqGF0
Air cooled chiller: https://youtu.be/0R84hLprO5s
Absorption Chiller : https://youtu.be/Ic5a9E2ykjo
Chiller/Cooling tower/AHU: https://youtu.be/1cvFlBLo4u0
Chiller flow rate: https://youtu.be/tA1_V6-dThM
Chiller fault troubleshooting: https://youtu.be/Zu0LVVNNVSw
Chiller COP calculation: https://youtu.be/h5ILlZ8nyHE
Chiller cooling capacity calcs: https://youtu.be/BZxXIdxVKeY
Chiller compressors: https://youtu.be/7Bah__spkTY
Chiller expansion valve: https://youtu.be/dXiV5YzTZQ4
Chiller surge: https://youtu.be/DQK_-vxObiw
Chiller condenser: https://youtu.be/p5uuPsyqnwU
Chiller evaporator: https://youtu.be/W3w7FpX9j9k
Chiller compressor centrifugal: https://youtu.be/PT0UIqAGacg
Chiller cooling capacity: https://youtu.be/f-N4isgQRGQ

HVAC ENGINEERING
HVAC Basics: https://youtu.be/klggop60vlM
Boilers/AHU/FCU: https://youtu.be/lDeuIQ4VeWk
How Heat Pump works: https://youtu.be/G53tTKoakcY
Heat pumps advanced: https://youtu.be/G53tTKoakcY
Fan Coil Units: https://youtu.be/MqM-U8bftCI
VAV Systems: https://youtu.be/HBmOyeWtpHg
CAV Systems: https://youtu.be/XgQ3v6lvoZQ
VRF Units: https://youtu.be/hzFOCuAho_4
Cooling load calculations: https://youtu.be/0gv2tJf7nwo
Pulley belt calculations: https://youtu.be/yxCBhD9nguw
Pump calculations: https://youtu.be/99vikjRrlgo
Fan and motor calculations: https://youtu.be/rl-HQRzL-kg
HVAC Cooling coils: https://youtu.be/oSs-4Ptcfhk
Cooling towers: https://youtu.be/UzHJWNL2OtM

REFRIGERATION SYSTEMS
How refrigerants work: https://youtu.be/lMqoKLli0Y4
Thermal expansion valves: https://youtu.be/oSLOHCOw3yg
Refrigeration design software: https://youtu.be/QqP5aY6liAg
Design refrigeration system: https://youtu.be/TPabv9iDENc
Reversing valve: https://youtu.be/r8n1_6qmsKQ
How A/C units work: https://youtu.be/Uv3GfEQhtPE



DATA CENTERS
Data Center cooling: https://youtu.be/xBxyhxmhigc