Electronics 2. Checkbook by S. A. Knight

By S. A. Knight

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985. What is its gain in common-emitter? 6 Say whether the following statements are true or false: (a) a E = 1 +aB (b) A transistor can be connected into a circuit in one of three possible ways. (c) The operation of a transistor depends upon which configuration it is in. (d) In common-base configuration the output signal is taken from between collector and base. (e) The input resistance of common-base is much greater than that of commonemitter. (0 Input resistance does not change significantly with collector voltage.

In the reverse direction the current flowing through it would be zero irrespective of the magnitude of the impressed voltage. In both cases, since power is represented by the product VI, the power dissipated would be zero. So the ideal diode would be loss free. A real diode has a small but finite forward resistance and a large but finite reverse resistance, so power must be dissipated within the element. Such a diode can be repre­ sented as an ideal diode having a small value resistor Rf connected in series with it to represent the actual forward resistance, and with a large value resistor RT connected in parallel to represent the actual reverse resistance, see Fig 11.

The transistors shown are n-p-n types, but equally p-n-p types could be substituted if the battery polarities were reversed. Notice that two voltmeters and two ammeters are used, since there are four variables involved, and two potentiometers Px and P2 provide variable voltage supplies from batteries (or similar power units). 38 *ç> w ΙΘΙ il Fig 8(a) rG>r-®

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