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Transformers for use at audio frequency (AF) are similar to those employed for 60-Hz electricity. The differences are that the frequency is somewhat higher (up to 20 kHz), and that audio signals exist in a band of frequencies (20 Hz to 20 kHz) rather than at just one frequency. Most audio transformers look like, and are constructed like miniature utility transformers. They have laminated E cores with primary and secondary windings wound around the cross bars, as shown in Fig. 18-4. Audio transformers can be either the step-up or step-down type. However, rather than being made to produce a specific voltage, audio transformers are designed to match impedances. Audio circuits, and in fact all electronic circuits that handle sine-wave or complex-wave signals, exhibit impedance at the input and output. The load has a certain impedance; a source has another impedance. Good audio design strives to minimize the reactances in the circuitry, so that the absolute-value impedance, Z, is close to the resistance R in the complex vector R + jX. This means that X must be zero or nearly zero. In the following discussion of impedance-matching transformers, both at audio and at radio frequencies, assume that the reactance is zero, so that the impedance is purely resistive, that is, Z R.

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GaAs is used in light-emitting diodes (LEDs), infrared-emitting diodes (IREDs), laser diodes, visible-light and infrared (IR) detectors, ultra-high-frequency (UHF) amplifying devices, and a variety of integrated circuits Selenium Selenium exhibits conductivity that varies depending on the intensity of visible light or IR radiation that strikes it All semiconductor materials exhibit this property, known as photoconductivity, to some degree; but in selenium the effect is especially pronounced For this reason, selenium is useful for making photocells Selenium is also used in certain types of rectifiers A rectifier is a component or circuit that converts ac to pulsating dc A significant advantage of selenium is the fact that it is electrically rugged Selenium-based components can withstand brief transients, or spikes, of abnormally high voltage, better than components made with most other semiconductor materials Germanium Pure elemental germanium is a poor electrical conductor It becomes a semiconductor only when impurities are added.

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One useful function of a transformer is that it can provide isolation between electronic circuits. While there is inductive coupling in a transformer, there is comparatively little capacitive coupling. The amount of capacitive coupling can be reduced by using cores that minimize the number of wire turns needed in the windings, and by keeping the windings separate from each other (rather than overlapping).

the furnace, the fiber solidifies. Needless to say, the process is carefully managed to ensure that the thickness of the fiber is precise; microscopes are used to verify the geometry of the fiber. Other stages in the manufacturing process include monitoring processes to check the integrity of the product, a coating process that applies a protective layer, and a take-up stage where the fiber is wound onto reels for later assembly into cables of various types.

A balanced load is one whose terminals can be reversed without significantly affecting circuit behavior. A plain resistor is a good example. The two-wire antenna input in a television receiver is another example of a balanced load. A balanced transmission line is usually a two-wire line, such as television antenna ribbon. An unbalanced load is a load that must be connected a certain way; switching its leads will result in improper circuit operation. Some radio antennas are of this type. Usually, unbalanced sources and loads have one side connected to ground. The coaxial input of a television receiver is unbalanced; the shield (braid) of the cable is grounded. An unbalanced transmission line is usually a coaxial line, such as you find in a cable television system. Normally, you cannot connect an unbalanced line to a balanced load, or a balanced line to an unbalanced load, and expect good performance from an electrical or electronic system. But a transformer can allow for mating between these two types of systems. In Fig. 18-10A, a balanced-to-unbalanced transformer is shown. Note that the balanced side is center-tapped, and the tap is grounded. In Fig. 18-10B, an unbalancedto-balanced transformer is illustrated. Again, the balanced side has a grounded center tap.

Germanium was used extensively in the early years of semiconductor technology Some diodes and transistors still use it A germanium diode has a low voltage drop (03 V, compared with 06 V for silicon and 1 V for selenium) when it conducts, and this makes it useful in some situations But germanium is easily destroyed by heat Extreme care must be used when soldering the leads of a germanium component..

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