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88 Resistors
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6-4 A bleeder resistor (R) is
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connected across the filter capacitor (C) in a power supply.
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It s a good idea to short out all filter capacitors, using a screwdriver with an insulated handle and wearing heavy, insulated gloves, before working on a dc power supply. Even if the supply has bleeder resistors, they might take a while to get rid of the residual charge. In addition, bleeder resistors can, and sometimes do, fail.
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Impedance Matching A more sophisticated application for resistors is in the coupling in a chain of amplifiers, or in the input and output circuits of amplifiers. In order to produce the greatest possible amplification, the impedances must agree between the output of a given amplifier and the input of the next. The same is true between a source of signal and the input of an amplifier. Also, this applies between the output of an amplifier and a load, whether that load is a speaker, a headset, or whatever. Impedance is the ac big brother of dc resistance. You will learn about impedance in Part 2 of this book.
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Fixed Resistors
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There are several ways in which fixed resistors (units whose resistance does not change, or cannot be adjusted) are manufactured. Here are the most common types.
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Carbon-Composition Resistors The cheapest method of making a resistor is to mix up powdered carbon (a fair electrical conductor) with some nonconductive substance, press the resulting claylike stuff into a cylindrical shape, and insert wire leads in the ends (Fig. 6-5). The resistance of the final product depends on the ratio
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6-5 Construction of a
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carbon-composition resistor.
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Fixed Resistors 89
of carbon to the nonconducting material, and also on the physical distance between the wire leads. This results in a carbon-composition resistor. Carbon-composition resistors can be manufactured in a wide range of resistance values. This kind of resistor also has the advantage of being nonreactive, meaning that it introduces almost pure resistance into the circuit, and not much capacitance or inductance. This makes carboncomposition resistors useful in radio receivers and transmitters. Carbon-composition resistors dissipate power according to how big, physically, they are. Most of the carbon-composition resistors you see in electronics stores can handle 1 4 W or 1 2 W. There are 1 8-W units available for miniaturized, low-power circuitry, and 1- or 2-W units for circuits where some electrical ruggedness is needed. Occasionally you ll see a carbon-composition resistor with a much higher power rating, but these are rare.
Wirewound Resistors Another way to get resistance is to use a length of wire that isn t a good conductor. The wire can be wound around a cylindrical form as a coil (Fig. 6-6). The resistance is determined by how well the wire metal conducts, by its diameter or gauge, and by its stretched-out length. This type of component is called a wirewound resistor.
6-6 Construction of a
wirewound resistor.
Wirewound resistors can be manufactured to have values within a very close range. They are precision components. Also, wirewound resistors can be made to handle large amounts of power. A disadvantage of wirewound resistors, in some applications, is that they act like inductors. This makes them unsuitable for use in most radio-frequency circuits. Wirewound resistors usually have low to moderate values of resistance.
Film-Type Resistors Carbon, resistive wire, or some mixture of ceramic and metal can be applied to a cylindrical form as a film, or thin layer, in order to obtain a specific resistance. This type of component is called a carbon-film resistor or metal-film resistor. Superficially, it looks like a carbon-composition resistor, but the construction is different (Fig. 6-7).
90 Resistors
6-7 Construction of a
film-type resistor.
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 resistors 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 resistors, do not have much inductance or capacitance. A disadvantage, in some applications, is that they can t handle as much power as carbon-composition or wirewound types.
Integrated-Circuit (IC) Resistors Resistors can be fabricated on a semiconductor wafer known as an integrated circuit (IC), also called a chip. The thickness, and the types and concentrations of impurities added, control the resistance of the component. Integrated-circuit resistors can handle only a tiny amount of power because of their small size.
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