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COMMON ELECTRONIC COMPONENTS
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robot project might contain a dozen or more components of varying types, including resistors, capacitors, integrated circuits, and light-emitting diodes. In this chapter, you ll read about the components commonly found in hobby electronic projects and their many specific varieties.
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Fixed Resistors
A fixed resistor supplies a predetermined resistance to a circuit. The standard unit of value of a resistor is the ohm, represented by the symbol . The higher the ohm value, the more resistance the component provides to the circuit. The value on most fixed resistors is identified by color coding, as shown in Fig. 5.1. The color coding starts near the edge of the resistor and comprises four, five, and sometimes six bands of different colors. Most offthe-shelf resistors for hobby projects use standard four-band color coding. If you are not sure what the resistance is for a particular resistor, use a volt-ohm meter to check it. Position the test leads on either end of the resistor. If the meter is not autoranging, start at a high range and work down. Be sure you don t touch the test leads or the leads of the resistor; if you do, you ll add the natural resistance of your own body to the reading.
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56 COMMON ELECTRONIC COMPONENTS
Tolerance Multiplier 2nd Significant figure 1st Significant figure Schematic symbol for a resistor
FIGURE 5.1 Resistors use color coding to denote their value. Start from the color band nearest the end. Most resistors have four bands: three for the value and one for the tolerance.
Resistors are also rated by their wattage. The wattage of a resistor indicates the amount of power it can safely dissipate. Resistors used in high-load applications, like motor control, require higher wattages than those used in low-current applications. The majority of resistors you ll use for hobby electronics will be rated at 1/4 or even 1/8 of a watt. The wattage of a resistor is not marked on the body of the component; instead, you must infer it from the size of the resistor.
Variable Resistors
Variable resistors, first introduced in 3, are more commonly known as potentiometers, let you dial in a specific resistance. The actual range of resistance is determined by the upward value of the potentiometer. Potentiometers are thus marked with this upward value, such as 10K, 50K, 100K, 1M, and so forth. For example, a 50K potentiometer will let you dial in any resistance from 0 ohms to 50,000 ohms. Note that the range is approximate only. Potentiometers are of either the dial or slide type, as shown in Fig. 5.2. The dial type is the most familiar and is used in such applications as television volume controls and electric blanket thermostat controls. The rotation of the dial is nearly 360 , depending on which potentiometer you use. In one extreme, the resistance through the potentiometer (or pot ) is zero; in the other extreme, the resistance is the maximum value of the component. Some projects require precision potentiometers. These are referred to as multiturn pots or trimmers. Instead of turning the dial one complete rotation to change the resistance from, say, 0 to 10,000 ohms, a multiturn pot requires you to rotate the knob three, five, ten, even fifteen times to span the same range. Most are designed to be mounted directly on the printed circuit board. If you have to adjust them you will need a screwdriver or plastic tool.
Fixed Capacitors
After resistors, capacitors are the second most common component found in the average electronic project. Capacitors serve many purposes. They can be used to remove traces of
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