Testing a BJT Transistor

This post is a blog on how to test a Bipolar Junction Transistor (BJT). The BJT transistor tested in the video is a PNP type. The majority of the BJTs that you come across will be NPN type transistors. Also, I uploaded some pics on what the voltage readings for both types will be with the multimeter set in the diode mode. Afterall, a Bipolar Junction Transistor has a makeup of two diodes put back to back, but sharing a common material (either the N or P material). PNP share the N (negative) material while NPN share the P (positive).

Going back, why are NPN transistors more common? PNP type transistors are difficult to bias as well as difficult to grasp lending quite a bit of confusion when you try to wrap your head around a circuit that contains one. This video only shows basic testing of a PNP type transistor not contained in a circuit. I know its a little difficult to see because I was using my new camera head-mount device (camera not included), but I hope you like it.

Here are the pics of the figures from an electronics book showing the voltage readings when the multimeter is set in the diode mode.

Alternative Testing Equipment