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

2016-06-26

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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)


connecting the base straight to the supply voltage
/youtube/video/WRm2oUw4owE?t=124.869
calculate the necessary base current
/youtube/video/WRm2oUw4owE?t=150.82001
recalculate the base resistor value with a 5 volt control voltage
/youtube/video/WRm2oUw4owE?t=188.2