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of an air-variable capacitor.
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Variable Capacitors 183
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Trimmer Capacitors When it is not necessary to change the value of a capacitor very often, a trimmer can be used. It consists of two plates, mounted on a ceramic base and separated by a sheet of plastic, mica, or some other solid dielectric. The plates are flexible, and can be squashed together more or less by means of a screw (Fig. 11-9). Sometimes two sets of several plates are interleaved to increase the capacitance. Trimmers can be connected in parallel with an air variable, so that the range of the air variable can be adjusted. Some air-variable capacitors have trimmers built in. Typical maximum values for trimmers range from a few picofarads up to about 200 pF. They handle low to moderate voltages, are highly efficient, and are nonpolarized. Coaxial Capacitors You recall from the previous chapter that sections of transmission lines can work as inductors. They can act as capacitors, too. If a section of transmission line is less than 1 4 wavelength long, and is left open at the far end (rather than shorted out), it behaves as a capacitor. The capacitance increases with length. The most common transmission-line capacitor uses two telescoping sections of metal tubing. This is called a coaxial capacitor. It works because there is a certain effective surface area between the inner and the outer tubing sections. A sleeve of plastic dielectric is placed between the sections of tubing, as shown in Fig. 11-10. This allows the capacitance to be adjusted by sliding the inner section in or out of the outer section.
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of a coaxial variable capacitor.
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Coaxial capacitors are used in RF applications, particularly in antenna systems. Their values are generally from a few picofarads up to about 100 pF.
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Capacitor Specifications
When you are looking for a capacitor for a particular application, it s important to find a component that has the right specifications for the job. Here are two of the most important specifications to watch for.
Tolerance Capacitors are rated according to how nearly their values can be expected to match the rated capacitance. The most common tolerance is 10%; some capacitors are rated at 5% or even at 1%. The lower (or tighter) the tolerance number, the more closely you can expect the actual component value to match the rated value. For example, a 10% capacitor rated at 100 pF can range from 90 to 110 pF. But if the tolerance is 1%, the manufacturer guarantees that the capacitance will be between 99 and 101 pF. Problem 11-6 A capacitor is rated at 0.10 F 10%. What is its guaranteed range of capacitance First, multiply 0.10 by 10 percent to get the plus-or-minus variation. This is 0.10 0.10 = 0.010 F. Then add and subtract this from the rated value to get the maximum and minimum possible capacitances. The result is a range of 0.09 to 0.11 F. Temperature Coefficient Some capacitors increase in value as the temperature increases. These components have a positive temperature coefficient. Some capacitors decrease in value as the temperature rises; these have a negative temperature coefficient. Some capacitors are manufactured so that their values remain constant over a certain temperature range. Within this span of temperatures, such capacitors have zero temperature coefficient. The temperature coefficient is specified in percent per degree Celsius (%/ C). Sometimes, a capacitor with a negative temperature coefficient can be connected in series or parallel with a capacitor having a positive temperature coefficient, and the two opposite effects cancel out over a range of temperatures. In other instances, a capacitor with a positive or negative temperature coefficient can be used to cancel out the effect of temperature on other components in a circuit, such as inductors and resistors.
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