Transistor Tester.(building a tester)(Brief Article)

Poptronics | February 1, 2002| | Copyright

Many times I have found it necessary to test bipolar junction transistors to determine what type of transistor I have and its condition. This is especially true with "house-marked" transistors. Here is a simple circuit that will allow you to test and Identify your bi-polar transistors.

Circuit Description. The two types of bi-polar transistors, NPN and PNP, can both be represented by diode circuits, as shown in Fig. 1. A simple circuit for testing bi-polar transistors is shown in Fig. 2. This circuit will determine transistor type (NPN or PNP) and open or shorted ...

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