Simple Transistor Tester Transistors are discrete electronics device majorly used for amplifying signal. However inn using this semiconductor, some experience difficulty in identifying the real pin out of this 3-terminal semiconductor device. The testing can be grouped as; 1. Distinguishing an NPN from a PNP type transistor 2. Identifying the Base, Emitter and Collector of all small signal type transistor 3. Testing and Identifying a faulty transistor 1. Distinguishing an NPN from a PNP transistor Finding the base of a transistor using an Analog multimeter Get an unknown transistor and test it with a multimeter (analog) set to "x10" Place the BLACK(negative) probe on a pin and the RED(positive) probe on the two other pins and observe the swing on the multimeter. If the meter swings nearly full scale for the six combinations . Then you have a PNP type transistor. The terminal at which the BLACK probe is kept stationary is the BASE of the trans
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