Because there are two parameters that affect I C, a set of individual curves shown together denote various operating conditions.Ī typical curve is shown in Figure 2a, and a set of these curves are depicted in Figure 2b. The characteristic curves of a transistor provide the relationship between collector-emitter voltage and collector current for different values of the base current. The base current can be varied by the variable resistor R B.įigure 1 Simple circuit for a transistor operation. This current can be varied either by changing the base current I B or the collector-emitter voltage V CE (the voltage between the collector C and the emitter E). We are interested in determining the variation of the collector current I C. Figure: Transistor Working with Two Power Suppliesįig u re 1 shows a simple circuit of a transistor, in which the 1.5 V battery and the resistance R B determine the base current I B, and the 24 V battery together with R C define the collector current I C.
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