This is how transistor 13001 works as an oscillator in a switched-mode power supply

Simple 13001 Transistor Audio Amplifier Circuit

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9 Types of Transistors and How They Work ⚡ How a Transistor Works (Part 2)

Transistors Explained | Switches, Amplifiers & How Transistors Work #transistors #engineering

Anatomy of a Transistor | BJT and MOSFET | Transistors Explained #electroniccomponents #transistors