Recall from class that a BJT transistor has two semiconductor junctions. This is
ID: 3308050 • Letter: R
Question
Recall from class that a BJT transistor has two semiconductor junctions. This is a good way to both help to identify the terminals of a transistor, to determine it's "flavor" (NPN or PNP) but perhaps even more importantly to spot check for a bad transistor in the wild. Below is a sketch of the 2N3904 transistor you'll be using in several labs this quarter. Identify emitter, base and collector terminals of the transistor and verify that each junction behaves under test like a diode by measuring the voltage drops across it using the multimeter's diode test function.Explanation / Answer
In this problem, you need a 2N3904 element which is a small signal NPN transistor whereas 2N3906 element is a silicon-based PNP transistor. The base-emitter (BE)and base-collector(BC) junctions behave as diodes and their corresponding voltage drop can be directly measured using a multimeter.The transistor is constructed such that BC junction dissipates more power and thus showing larger voltage drop than that for the BE junction. Also similar to a diode, the diode test option can be used to check the direction of the bias of any of the two junctions. Use the above facts to decide the junctions.
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