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At Audio Frequencies Transformers for use at 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 only one frequency. Most AF transformers are constructed like miniature utility transformers. They have laminated E cores with primary and secondary windings wound around the crossbars, as shown in Fig. 18-4. Audio transformers can be either the step-up or the step-down type. However, rather than being made to produce a specific voltage, AF 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 reactance in the circuitry, so that the absolute-value impedance Z is close to the resistance R. This means that X must be zero or nearly zero. In the following discussion of impedance-matching transformers, for both AF and RF applications, assume that the reactance is zero, so the impedance is purely resistive with Z = R + j 0.

Shifting the phase of an ac sine wave by 90 degrees is the same thing as: A Moving it to the right or left by a full cycle B Moving it to the right or left by 1 4 cycle C Turning it upside-down D Leaving it alone 11 A phase difference of 540 degrees would more often be spoken of as: A An offset of more than one cycle B Phase opposition C A cycle and a half D 15 Hz 12 Two sine waves are in phase opposition Wave X has a peak amplitude of 4 V and wave Y has a peak amplitude of 8 V The resultant has a peak amplitude of: A 4 V, in phase with the composites B 4 V, out of phase with the composites C 4 V, in phase with wave X D 4 V, in phase with wave Y.

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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.

Transformers 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 physically separated from each other (rather than overlapping).

13 If wave X leads wave Y by 45 degrees of phase, then: A Wave Y is 1 4 cycle ahead of wave X..

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228 Phase B. Wave Y is 1 4 cycle behind wave X. C. Wave Y is 1 8 cycle behind wave X. D. Wave Y is 1 16 cycle ahead of wave X. 14. If wave X lags wave Y by 1 3 cycle, then: A. Y is 120 degrees earlier than X. B. Y is 90 degrees earlier than X. C. Y is 60 degrees earlier than X. D. Y is 30 degrees earlier than X. 15. In the drawing of Fig. 12-12: A. X lags Y by 45 degrees. B. X leads Y by 45 degrees. C. X lags Y by 135 degrees. D. X leads Y by 135 degrees.

Balanced and Unbalanced Loads and Lines 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 oldfashioned TV ribbon, also called twinlead An unbalanced load is a load that must be connected a certain way Switching its leads will result in improper circuit operation In this sense, an unbalanced load is a little like a polarized component such as a battery or capacitor Many wireless 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.

16. Which of the drawings in Fig. 12-13 represents the situation of Fig. 12-12 A. A. B. B. C. C. D. D.

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