A bipolar transistor tester
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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