By Hans W. Gschwind

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3. Functions of Two Variables Considering two binary variables, say A and B, we can have anyone of the following four distinct conditions: I. A = 0, B = OJ II. A = 0, B = 1; III. A = 1, B = 0; IV. A = 1, B = 1. Accordingly, the Venn diagram and the Karnaugh map will show the universal set divided into four distinct areas: o 8

A bipolar or junction transistor is a transistor that consists of two pn junctionss • Thus a junction transistor exhibits some similarity' to a semiconductor diode. Since there can be interactions between the two junctions of a transistor it is a more complex (and powerful) device than two interconnected diodes. The purpose of the following material is to develop a model of a junction transistor. The model • Actually transistors having more than three elements and thus more than two pn junctions are also used.

Electric and electronic switching elements lend themselves very readily to this treatment: a switch is either on or off; a tube or a transistor is conducting or non-conducting; a relay is energized or not energized; contacts are closed or open; pulses or potentials are present or absent, etc. The two possible states of a binary variable may be indicated by the two symbols and 1. It is customary to use the symbol 1 to represent affirmative conditions like: yes, true, existing, on, present; and the symbolO for their opposites: no, false, non-existing, off, absent, etc.

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