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The triac-driven opto-couplers each contain a gallium arsenide or gallium aluminum arsenide infrared-emitting diode coupled to a photodiode and a zero-voltage bidirectional triac driver mounted in a standard six-pin dual inline package (DIP), the type ICs use These devices are intended to be used for low-power DC control of power triacs, which in turn control resistive, inductive, or capacitive loads powered from the 120-volt AC or 220-volt AC with required LED drive currents of 30, 15, 10, or 5 milliamperes Zero-voltage crossing ensures that the device will not turn on until the line voltage reduces to 15 volts for the 120-volt devices and 25 volts for the 220-volt devices
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Transistors are semiconductor devices made from N- and P-type crystals Once joined, the two different types of crystal produce junctions Transistors are identi ed according to emitter junction and collector junction
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A PNP transistor is formed by a thin N region between two P regions The center N region is called the base This base is usually 0001 inch thick A collector junction and an emitter junction are also formed NPN and PNP transistors (see Figure 15-7) are the two most popular types The main difference between the two transistors is in polarity Polarity can be recognized by pin locations on transistors Pin designations for speci c transistors are found in a transistor handbook The important thing to remember in transistor circuits is polarity and voltage The polarity of the voltage is very important in the proper operation of the transistor NPN and PNP types differ only in their polarity Surface-mounted technology has increased ef ciency and lowered the cost of integrated circuits for control circuits and computers See Figure 15-8
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FIGURE 15-7 The two most popular types of transistors, PNP and NPN, come in a wide variety of pin designations
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FIGURE 15-8 Surface-mount components represent the latest in integrated circuits The unit can be surface mounted or soldered in place easier and more quickly than previously
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How to Measure
The electrician frequently needs to measure when on the job The measurements may be linear for example, measuring lines on a blueprint and understanding what they represent or measuring lengths of wire or distances between switches or outlets Measurements may also be of wire diameter or of electrical phenomena such as current, voltage, or resistance Devices and tools are available for all of these and other types of measurement the electrician may be called on to do Some of these were discussed earlier Here we discuss how to use some of the most frequently employed measuring devices However, before doing this, we should point out there are many terms and abbreviations used in measuring electrical phenomena terms not used in other elds and often not familiar to the layperson The electrician and apprentice must be thoroughly familiar with all of these terms
USING SCALES AND RULES
The engineer uses several types of scales and rules on the job These are used to read blueprints, to
Measure the length of wire Locate switch boxes Do many other things
ARCHITECT S SCALE
The architect s scale is most often used by the electrician when reading blueprints, which allows the use of the same scale as that used to make the drawing Figure 16-1 shows how the architect s scale is used to measure to scale Figure 16-la shows a scale that is 12 inches long (see top part of drawing) A 1/8 -inch scale is visible at the top edge This means that 1/8-inch is equal to 1 foot, unless otherwise noted on the drawing Figure 16-1b shows the same scale, extended to 24 inches Notice that units are numbered at intervals of 4 Remember, however, that each long line equals 1 foot If, for example, you read between 0 and 23 on the scale, you have 23 feet Then, if the line you are measuring is a little more than 23 feet but not 24 feet, read backward from 0 on the graduated scale You are measuring halfway between 0 and the end of the scale The halfway mark is