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Unformatted text preview: Bipolar Transistors I Page 1 Bipolar Transistors I The first test of a transistor There are a number of questions in this write-up indicated by an asterisk (*), that you should address prior to coming to the lab. This lab uses an NPN transistor, the 2N2219. Like any NPN transistor, it consists of two PN junctions, as shown in Fig. 1 (b) You can make a crude test of a transistor by using the diode test option on a multimeter. This option sets the terminals of the multimeter so as to forward bias the junction and then to read the voltage across it. For a silicon transistor like the 2N2219 you expect to find a forward voltage of 0.6 or 0.7 volts. Test both the base- collector and the base-emitter junctions of your transistor. 2 . Common emitter characteristics The goal of this section is to make a plot showing the collector current I C vs. the collector-emitter voltage V CE for several different values of the base current I B . To eliminate some of the repetitious work we will do this using the LabView program Tran_param.vi. Figure 2 below shows the circuit that is used to do the measurement. The voltage on the collector is swept through a range of values chosen by the student for several values of the base voltage. The collector current is by the student for several values of the base voltage....
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- Spring '06