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Suppose a linear-taper potentiometer has a value of zero to 280 . In most units the shaft can be rotated through about 280 , or a little more than three-quarters of a circle. The resistance between the center and one end terminal will increase right along with the number of angular degrees that the shaft is turned. The resistance between the center and the other end terminal will be equal to 280 minus the number of degrees the shaft is turned. The resistance is a linear function of the angular shaft position. Linear-taper potentiometers are commonly used in electronic test instruments and in various consumer electronic devices. Figure 6-9 is a graph of relative resistance versus relative angular shaft displacement for a linear-taper potentiometer.

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.

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One type of potentiometer uses a strip of resistive material whose density is constant all the way around. This results in a linear taper. The resistance between the center terminal and either end terminal changes at a steady rate as the control shaft is turned. Suppose a linear taper potentiometer has a value of zero to 280 . In most units the shaft rotates about 280 degrees, or a little more than three-quarters of a circle. Then the resistance between the center and one end terminal will increase right along with the number of degrees that the shaft is turned. The resistance between the center and the other end terminal will be equal to 280 minus the number of degrees the shaft is turned. Engineers say that the resistance is a linear function of the shaft position. Linear taper potentiometers are commonly used in electronic test instruments and in various consumer electronic devices. A graph of resistance versus shaft displacement for a linear taper potentiometer is shown in Fig. 6-9.

Audio-Taper Potentiometer In some applications, linear taper potentiometers don t work well. The volume control of a radio receiver or hi-fi audio amplifier is a good example. Humans perceive sound intensity according to the logarithm of the actual sound power. If you use a linear-taper potentiometer as the volume control for a radio or other sound system, the sound volume will vary too slowly in some parts of the control range, and too fast in other parts of the control range. To compensate for the way in which people perceive sound level, an audio-taper potentiometer is used. In this device, the resistance between the center and end terminal increases as a nonlinear function of the angular shaft position. The device is sometimes called a logarithmic-taper potentiometer or log-taper potentiometer because the nonlinear function is logarithmic. This precisely compensates for the way the human ear-and-brain machine responds to sounds of variable intensity. Audio-taper potentiometers are manufactured so that as you turn the shaft, the sound intensity

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There are some applications for which linear taper potentiometers don t work well. The volume control of a radio receiver is a good example. Your ear/brain perceives sound level according to the logarithm of its true level. If you use a linear taper potentiometer as the volume control of a transistor radio or other sound system, the level will seem to go up too slowly in some parts of the control range and too fast in other parts of the control range. To compensate for the way in which people perceive sound level, an audio taper potentiometer is used. In this device, the resistance between the center and end terminal increases in a nonlinear way. This type of potentiometer is sometimes called a logarithmic-taper device. If the shaft is all the way counterclockwise, the volume at the speaker is zero or near zero. If you turn the shaft 30 degrees clockwise, the volume increases to some perceived level; call it one sound unit. If you then turn the volume 30 degrees further clockwise, the volume will seem to go up to two sound units. But in fact it has increased much more than this, in terms of actual sound power. You perceive sound not as a direct function of the true volume, but in units that are based on the logarithm of the intensity. Audio-taper potentiometers are manufactured so that as you turn the shaft, the sound seems to increase in a smooth, natural way. A graph of resistance versus shaft displacement for an audio-taper potentiometer is shown in Fig. 6-10.

seems to increase in a smooth, natural way. Figure 6-10 is a graph of relative resistance versus relative angular shaft displacement for an audio-taper potentiometer.

6-10

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