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Decades ago, vacuum tubes, also known as electron tubes, were the only devices available for use as amplifiers, oscillators, detectors, and other electronic circuits and systems. A typical tube (called a valve in England) ranged from the size of your thumb to the size of your fist. They are still used in some power amplifiers, microwave oscillators, and video display units. Tubes generally require high voltage. Even in modest radio receivers, 100 V to 200 V dc was required when tubes were employed. This mandated bulky power supplies, and created an electrical shock hazard. Nowadays, a transistor of microscopic dimensions can perform the functions of a tube in most situations. The power supply can be a couple of AA cells or a 9-V transistor battery. Even in high-power applications, transistors are smaller and lighter than tubes. Figure 19-1 is a size comparison drawing between a transistor and a vacuum tube for use in an AF or RF power amplifier. Integrated circuits (ICs), hardly larger than individual transistors, can do the work of hundreds or even thousands of vacuum tubes. An excellent example of this technology is found in personal computers and the peripheral devices used with them. 19-1 A power-amplifier

This voltage is commonly employed with heavy appliances, such as the kitchen oven/stove (if they are electric), heating (if it is electric), and the laundry washer and dryer A 117-V outlet supplies just one phase, appearing between two of the three prongs in the outlet The third prong is for ground (Fig 18-9B)..

transistor (at left) is much smaller than a vacuum tube of comparable powerhandling capacity (right). 315

To make fiber from a preform, the preform is mounted in a furnace at the top of a tall building called a drawing tower. The bottom of the preform is heated until it has the consistency of taffy, at which time the soft glass is drawn down to form a thin fiber. When it strikes the cooler air outside

The lowest level of power transformer is found in electronic equipment such as television sets, ham radios, and home computers.

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Various elements, compounds, and mixtures can function as semiconductors. The two most common materials are silicon and a compound of gallium and arsenic known as gallium arsenide (often abbreviated GaAs). In the early years of semiconductor technology, germanium formed the basis for many semiconductors; today it is seen occasionally, but not often. Other substances that work as semiconductors are selenium, cadmium compounds, indium compounds, and the oxides of certain metals.

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

336 Transformers and impedance matching Most solid-state devices use low voltages, ranging from about 5 V up to perhaps 50 V. This equipment needs step-down power transformers in its power supplies. Solid-state equipment usually (but not always) consumes relatively little power, so the transformers are usually not very bulky. The exception is high-powered audio-frequency or radio-frequency amplifiers, whose transistors can demand more than 1000 watts (1 kW) in some cases. At 12 V, this translates to 90 A or more. Television sets have cathode-ray tubes that need several hundred volts. This is derived by using a step-up transformer in the power supply. Such transformers don t have to supply a lot of current, though, so they are not very big or heavy. Another type of device that needs rather high voltage is a ham-radio amplifier with vacuum tubes. Such an amplifier requires from 2 kV to 5 kV. Any voltage higher than about 12 V should be treated with respect. The voltages in televisions and ham radios are extremely dangerous, even after the equipment has been switched off. Do not try to service such equipment unless you are trained to do so!

Silicon Silicon (chemical symbol Si) is widely used in diodes, transistors, and integrated circuits Generally, other substances, or impurities, must be added to silicon to give it the desired properties The best quality silicon is obtained by growing crystals in a laboratory The silicon is then fabricated into wafers or chips Gallium Arsenide Another common semiconductor is the compound gallium arsenide Engineers and technicians call this material by its acronym-like chemical symbol, GaAs, pronounced gas If you hear about gasfets and gas ICs, you re hearing about gallium-arsenide technology GaAs devices require little voltage, and will function at higher frequencies than silicon devices because the charge carriers move faster through the semiconductor material GaAs devices are relatively immune to the effects of ionizing radiation such as X rays and gamma rays.

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