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40 TOOLS AND SUPPLIES
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components. No matter what size you eventually settle on for your own robots, keep several feet of extruded aluminum handy at all times. You ll always use it. If extruded aluminum is not available, you can use shelving standards, the barlike channel stock used for wall shelving. It s most often available in steel, but some hardware stores carry it in aluminum (silver, gold, and black anodized). Use this as a last resort, however, because shelving standards can add a considerable amount of weight to your robot.
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Angle Brackets
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Also ideal for metal robots (and some plastic and wood ones) is an assortment of 3/8-inch and 1/2-inch galvanized iron brackets. These are used to join the extruded stock or other parts together. Use 1 1/2-inch by 3/8-inch flat corner irons when joining pieces cut at 45 angles to make a frame. Angle irons measuring 1 inch by 3/8 inch and 1 1/2 inch by 3/8 inch are helpful when attaching the stock to baseplates and when securing various components to the robot. Beware of weight! Angle brackets are heavy when you use a lot of them in your robot. If you find the body of your robot is a few pounds more than it should be, consider substituting the angle brackets with other mounting techniques, including gluing, brazing (for metal), or nails (for wood robots).
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Most of the electronic projects you ll assemble for this book, and for other books involving digital and analog circuits, depend on you having a regular stable of common electronic components. If you do any amount of electronic circuit building, you ll want to stock up on the following standard components. If you keep spares handy you won t have to make repeat trips to the electronics store. If you re new to electronics, see 5, Common Electronic Components and refer to Appendix A, Further Reading, for more information.
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Get a good assortment of 1/8- and 1/4-watt resistors. Make sure the assortment includes a variety of common values and that there are several of each value. Supplement the assortment with individual purchases of the following resistor values: 270 ohm, 330 ohm, 1K ohm, 3.3K ohm, 10K ohm, and 100K ohm. The 270- and 330-ohm values are often used with lightemitting diodes, and the other values are common to TTL and CMOS digital circuits.
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Variable resistors, or potentiometers (pots) as they are also called, are relatively cheap and are a boon to anyone designing and troubleshooting circuits. Buy an assortment of the small PC-mount pots (about 80 cents each retail) in the 1-megohm and 2.5K-, 5K-, 10K-, 50K-, 100K-, 500K-, and 250K-ohm values. You ll find that 500K-ohm and 1-megohm pots are often used in op amp circuits, so buy a few extra of these.
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ELECTRONIC SUPPLIES AND COMPONENTS 41
CAPACITORS
Like resistors, you ll find yourself returning to the same standard capacitor values project after project. For a well-stocked shop, get a dozen or so each of the following inexpensive ceramic capacitors: 0.1, 0.01, and 0.001 F (microfarad). Many circuits use in-between values of 0.47, 0.047, and 0.022 F. You may want to get a couple of these as well. Power supply, timing, and audio circuits often use larger polarized electrolytic or tantalum capacitors. Buy a few each of the 1.0-, 2.2-, 4.7-, 10-, and 100- F values. Some projects call for other values (in the picofarad range and the thousandth of a microfarad range). You can buy these as you need them unless you find yourself returning to standard values repeatedly.
TRANSISTORS
There are thousands of transistors available, and each one has slightly different characteristics. Most applications need nothing more than generic transistors for simple switching and amplifying. Common NPN signal transistors are the 2N2222 and the 2N3904 (some transistors are marked with an MPS prefix instead of the 2N prefix; nevertheless, they are the same). Both kinds are available in bulk packages of 10 for about $1. Common PNP signal transistors are the 2N3906 and the 2N2907. (See 5 for the difference between NPN and PNP.) If the circuit you re building specifies a transistor other than the generic kind, you may still be able to use one of the generic ones if you first look up the specifications for the transistor called for in the schematic. A number of cross-reference guides provide the specifications and replacement-equivalents for popular transistors. There are common power transistors as well, and these are often used to provide current to larger loads, such as motors. The NPN TIP 31 and TIP 41 are familiar to most anyone who has dealt with power switching or amplification of up to 1 amp or so. PNP counterparts are the TIP 32 and TIP 42. These transistors come in the TO-220 style package (see Fig. 3.6). A common larger-capacity NPN transistor that can switch 10 amps or more is the 2N3055. It comes in the TO-3 style package and is available everywhere. It costs between 50 cents and $2, depending on the source.
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