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Both LEDs and IREDs are useful in communications because their intensity can be modulated to carry information. When the current through the device is sufficient to produce output, but not enough to cause saturation, the LED or IRED output will follow along with rapid current changes. Voices, music, and digital signals can be conveyed over light beams in this way. Some modern telephone systems make use of modulated light, transmitted through clear fibers. This is known as fiberoptic technology. Special LEDs and IREDs produce coherent radiation; these are called laser diodes. The rays from these diodes aren t the intense, parallel beams that you probably imagine when you think about lasers. A laser LED or IRED generates a cone-shaped beam of low intensity. But it can be focused, and the resulting rays have some of the same advantages found in larger lasers.

Dispersion-Shifted Fiber (DSF)

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3. Of the following appliances, which would need the biggest transformer (a) A clock radio (b) A television broadcast transmitter (c) A shortwave radio receiver (d) A home television set 4. An advantage of full-wave bridge rectification is the fact that (a) it uses the whole transformer secondary for the entire ac input cycle. (b) it costs less than other rectifier types. (c) it cuts off half of the ac wave cycle. (d) it never needs a filter. 5. In a power supply designed to provide high power at low voltage, the best rectifier circuit would probably be the (a) half-wave arrangement. (b) full-wave, center-tap arrangement. (c) quarter-wave arrangement. (d) voltage doubler arrangement. 6. The part of a power supply immediately preceding the regulator is (a) the transformer. (b) the rectifier. (c) the filter. (d) the ac input. 7. If a half-wave rectifier is used with 165-V pk ac input, the effective dc output voltage is (a) considerably less than 165 V. (b) slightly less than 165 V. (c) exactly 165 V. (d) slightly more than 165 V. 8. If a full-wave bridge circuit is used with a transformer whose secondary provides 50 V rms, the peak voltage that occurs across the diodes in the reverse direction is approximately (a) 50 V pk. (b) 70 V pk. (c) 100 V pk. (d) 140 V pk. 9. What is the principal disadvantage of a voltage-doubler power supply circuit (a) Excessive current (b) Excessive voltage (c) Insufficient rectification (d) Poor regulation under heavy loads

Virtually all P-N junctions exhibit characteristics that change when electromagnetic rays strike them. The reason that conventional diodes are not affected by these rays is that most diodes are enclosed in opaque packages. Some photosensitive diodes have variable resistance that depends on light intensity. Others actually generate dc voltages in the presence of electromagnetic radiation.

10. Suppose a transformer secondary provides 10-V rms ac to a voltage-doubler circuit. What is the approximate dc output voltage with no load (a) 14 V (b) 20 V (c) 28 V (d) 36 V 11. The ripple frequency from a full-wave rectifier is (a) twice that from a half-wave circuit. (b) the same as that from a half-wave circuit. (c) half that from a half-wave circuit. (d) 1 4 that from a half-wave circuit. 12. Which of the following would make the best filter for a power supply (a) A capacitor in series (b) A choke in series (c) A capacitor in series and a choke in parallel (d) A capacitor in parallel and a choke in series 13. If you need exceptionally good ripple filtering for a power supply, which of the following alternatives will yield the best results (a) Connect several capacitors in parallel. (b) Use a choke-input filter. (c) Connect several chokes in series. (d) Use two capacitor/choke filtering sections in cascade. 14. Voltage regulation can be accomplished by a Zener diode connected in (a) parallel with the filter output, forward-biased. (b) parallel with the filter output, reverse-biased. (c) series with the filter output, forward-biased. (d) series with the filter output, reverse-biased. 15. A current surge takes place when a power supply is first turned on because (a) the transformer core is suddenly magnetized. (b) the diodes suddenly start to conduct. (c) the filter capacitor(s) must be initially charged. (d) arcing takes place in the power switch. 16. Transient suppression is of importance mainly because it minimizes the risk of (a) diode failure. (b) transformer imbalance. (c) filter capacitor overcharging. (d) poor voltage regulation.

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