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A bipolar transistor tester

Introduction

This is a circuit which wilt test normal transistors, i.e. npn or pnp. It has the advantage of being able to test devices while they are still connected in their original circuits. However, when such tests are made, the circuit containing the transistor under test must not be switched on.

The circuit and how it works

The circuit runs from a 9 V battery such as a PP3 or six AA-type 1.5 V cells. Alkaline cells are to be preferred, as their electrolyte leakage properties are better. The circuit shown in Figure 1 uses a single CMOS integrated circuit type 4001 or 4011. CMOS circuits require special handling precautions which are described in the project Christmas Tree LEDs, elsewhere in this book. ...

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