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102 Resistors
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A bleeder resistor is connected across the filter capacitor in a power supply.
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It s always a good idea to short out all filter capacitors, using a screwdriver with an insulated handle, before working on a high-voltage dc power supply. I recall an instance when I was repairing the supply for a radio power amplifier. The capacitors were holding about 2 kV. My supervisor, not very well acquainted with electronics, was looking over my shoulder. I said, Gonna be a little pop, now, and took a Phillips screwdriver, making sure I had hold of the insulated handle only, and shorted the filter capacitor to the chassis. Bang! I gave my supervisor a brief explanation while he took some deep breaths. Even if a supply has bleeder resistors, they take awhile to get rid of the residual charge. For safety, always do what I did, whether your supervisor is around or not.
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Impedance matching
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A more subtle, more sophisticated use 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 the last amplifier in a chain, and the load, whether that load is a speaker, a headset, a FAX machine, or whatever. Impedance is the alternating-current (ac) cousin of resistance in direct-current (dc) circuits. This is discussed in the next section of this book.
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The carbon-composition resistor
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Probably the cheapest method of making a resistor is to mix up finely powdered carbon (a fair electrical conductor) with some nonconductive substance, press the resulting clay-like stuff into a cylindrical shape, and insert wire leads in the ends (Fig. 6-5). The resistance of the final product will depend on the ratio of carbon to the nonconducting material, and also on the physical distance between the wire leads. The nonconductive material is usually phenolic, similar to plastic. This results in a carbon-composition resistor. Carbon-composition resistors can be made to have quite low resistances, all the way up to extremely high resistances. This kind of resistor has the advantage of being pretty much nonreactive. That means that it introduces almost pure resistance into the circuit, and not much capacitance or inductance. This makes the carbon-composition resistor useful in radio receivers and transmitters.
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The wirewood resistor 103
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Construction of a carbon-composition resistor.
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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 for miniaturized, low- power circuitry, and 1-W or 2-W components for circuits where some electrical ruggedness is needed. Occasionally you ll see a much larger unit, but these are rare.
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The wirewound resistor
A more obvious way to get resistance is to use a length of wire that isn t a good conductor. Nichrome is most often used for this. The wire can be wound around a cylindrical form, like a coil (Fig. 6-6). The resistance is determined by how well the wire metal conducts, by its diameter or gauge, and by its length. This component is called a wirewound resistor.
Construction of a wirewound resistor.
104 Resistors One of the advantages of wirewound resistors is that they can be made to have values within a very close range; that is, they are precision components. Another advantage is that wirewound resistors can be made to handle large amounts of power. Some wirewounds might actually do well as electric heaters, dissipating hundreds, or even thousands of watts. 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.
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