Easy Ways to Use a Transistor: 14 Steps (with Pictures) - wikiHow
What is a Phototransistor? - Tech-FAQ
Transistors - SparkFun Learn
What is a Transistor?
What is a Transistor? | Working Principles of Transistors | RealPars
Basics of Phototransistor
Vishay Intertechnology BPW77NA Phototransistor Silicon Chip, NPN Transistor, Visible Light, 850 nm 3-Pin, 5.5 mm W x 6.15 mm H x 5.5 mm L (Pack of 2): Amazon.com: Industrial & Scientific
Transistor - Definition, Working Principle, Types, Transistor Diagram