Electronic Basics #22: Transistor (BJT) as a Switch

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In this episode of Electronic Basics I will show you how to use NPN and PNP Bipolar Junction Transistors as switches in order to turn on and off your electronic load with a control signal. This way you can, for example, use your Arduino to control loads that require more current than the output of the Arduino can handle.
Music:
Killing Time, Kevin MacLeod (incompetech.com)