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Film type resistors
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Carbon, nichrome, or some mixture of ceramic and metal (cermet) can be applied to a cylindrical form as a film, or thin layer, in order to obtain a desired value of resistance. This type of resistor is called a carbon-film resistor or metal-film resistor. It looks like a carbon-composition type, but the construction technique is different (Fig. 6-7).
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Construction of a film type resistor.
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The cylindrical form is made of an insulating substance, such as porcelain. The film is deposited on this form by various methods, and the value tailored as desired. Metal-film units can be made to have nearly exact values. Film type resistors usually have low to medium-high resistance. A major advantage of film type resistors is that they, like carbon-composition units, do not have much inductance or capacitance. A disadvantage, in some applications, is that they can t handle as much power as the more massive carbon-composition units or as wirewound types.
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Integrated- circuit resistors
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Increasingly, whole electronic circuits are being fabricated on semiconductor wafers known as integrated circuits (ICs). It is possible nowadays to put a whole radio receiver
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The potentiometer 105 into a couple of ICs, or chips, whose total volume is about the same as that of the tip of your little finger. In 1930, a similar receiver would have been as large as a television set. Resistors can be fabricated onto the semiconductor chip that makes up an IC. The thickness, and the types and concentrations of impurities added, control the resistance of the component. IC resistors can only handle a tiny amount of power because of their small size. But because IC circuits in general are designed to consume minimal power, this is not a problem. The small signals produced by ICs can be amplified using circuits made from discrete components if it is necessary to obtain higher signal power.
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The potentiometer
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All of the resistors mentioned are fixed in value. It is impossible to change or adjust their resistances. Of course, their values will change if they overheat, or if you chip pieces of them out, but they re meant to provide an unchanging opposition to the flow of electric current. It might have occurred to you that a variable resistor can be made by hooking up a bunch of fixed resistors in series or parallel, and then switching more or fewer of them in and out. This is almost never done in electronic circuits because there s a better way to get a variable resistance: use a potentiometer. The construction of a potentiometer is shown in simplified form in Fig. 6-8. A resistive strip is bent into a nearly complete circle, and terminals are connected to either end. This forms a fixed resistance. To obtain the variable resistance, a sliding contact is attached to a rotatable shaft and bearing, and is connected to a third terminal. The resistance between this middle terminal, and either of the end terminals, can vary from zero up to the resistance of the whole strip. Some potentiometers use a straight strip of resistive material, and the control moves up and down, or from side to side. This type of variable resistor, called a slide potentiometer, is used in graphic equalizers, as the volume controls in some stereo amplifiers, and in some other applications when a linear scale is preferable to a circular scale. Potentiometers are made to handle only very low levels of current, at low voltage.
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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.
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