1 Tutorial: How to design a transistor circuit that controls low-power devices
A tutorial on using a transistor to switch a load that an Arduino pin cannot drive directly, commonly suggested for relays, motors and LED strips.
Topic
base resistor
3 videos. Ranked by independent recommendations, not by views.
2 Using Transistors with the Raspberry Pi (Part 2 of 2)
The second part of a two-video introduction to switching loads with transistors from a Pi's GPIO, used by beginners building things such as fan controllers.
3 PNP Transistor Tutorial (with the Raspberry Pi)
A Raspberry Pi focused explanation of switching with a PNP transistor and calculating its base resistor, offered to newcomers and followed by people designing their own circuits.
