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17. If a fuse blows, and it is replaced with one having a lower current rating, there is a good chance that (a) the power supply will be severely damaged. (b) the diodes will not rectify. (c) the fuse will blow out right away. (d) transient suppressors won t work. 18. Suppose you see a fuse with nothing but a straight wire inside. You can assume that this fuse (a) is a slow-blow type. (b) is a quick-break type. (c) has a low current rating. (d) has a high current rating. 19. In order to minimize the risk of diode destruction as a result of surge currents that can occur when a power supply is first switched on, which of the following techniques can be useful (a) Connecting multiple diodes in parallel, with low-value resistors in series with each diode (b) Connecting multiple diodes in parallel, with low-value capacitors in series with each diode (c) Connecting multiple diodes in series, with low-value chokes across each diode (d) Connecting multiple diodes in series, with low-value resistors across each diode 20. To repair a damaged power supply with which you are not completely familiar, you should (a) install bleeder resistors before beginning your work. (b) remove the fuse before beginning your work. (c) leave it alone and have a professional work on it. (d) short out all the diodes before beginning your work.
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The Bipolar Transistor
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CURRENT-TRANSFERRING RESISTOR. A BIPOLAR transistor has two P-N junctions. There are two configurations: a P-type layer sandwiched between two N-type layers, or an N-type layer between two P-type layers.
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THE WORD TRANSISTOR IS A CONTRACTION OF
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NPN versus PNP
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A simplified drawing of an NPN bipolar transistor is shown in Fig. 22-1A, and the schematic symbol is shown in Fig. 22-1B. The P-type, or center, layer is called the base. One of the N-type semiconductor layers is the emitter, and the other is the collector. Sometimes these are labeled B, E, and C in schematic diagrams. A PNP bipolar transistor has two P-type layers, one on either side of a thin N-type layer (Fig. 22-2A). The schematic symbol is shown in Fig. 2-22B. It s easy to tell whether a bipolar transistor in a diagram is NPN or PNP. If the device is NPN, the arrow at the emitter points outward. If the device is PNP, the arrow at the emitter points inward. Generally, PNP and NPN transistors can perform the same functions. The differences are the polarities of the voltages and the directions of the resulting currents. In most applications, an NPN device can be replaced with a PNP device or vice versa, the power-supply polarity can be reversed, and the circuit will work in the same way as long as the new device has the appropriate specifications.
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22-1 At A, pictorial diagram
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of an NPN transistor. At B, the schematic symbol. Electrodes are E = emitter, B = base, and C = collector.
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Biasing 353
22-2 At A, pictorial diagram
of a PNP transistor. At B, the schematic symbol. Electrodes are E = emitter, B = base, and C = collector.
Biasing
Imagine a bipolar transistor as consisting of two diodes in reverse series. You can t normally connect two diodes this way and get a working transistor, but the analogy is good for modeling the behavior of bipolar transistors. A dual-diode NPN transistor model is shown in Fig. 22-3A. The base is formed by the connection of the two anodes. The emitter is one of the cathodes, and the collector is the other cathode. Figure 22-3B shows the equivalent real-world NPN transistor circuit.
The NPN Case The normal method of biasing an NPN transistor is to have the collector voltage positive with respect to the emitter. This is shown by the connection of the battery in Figs. 22-3A and 22-3B. Typical dc voltages for a transistor power supply range between 3 V and about 50 V. A typical voltage is 12 V. In the model and also in the real-world transistor circuit, the base is labeled control, because the flow of current through the transistor depends critically on what happens at this electrode. Zero Bias for NPN Suppose the base of a transistor is at the same voltage as the emitter. This is known as zero bias. When the forward bias is zero, the emitter-base current, often called simply base current and de-
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