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Constructing electronic circuit boards or wiring the power system of your robot requires only a few standard tools. A soldering iron leads the list. For maximum flexibility, invest in a modular soldering pencil, the kind that lets you change the heating element. For routine electronic work, you should get a 25- to 30-watt heating element. Anything higher may damage electronic components. You can use a 40- or 50-watt element for wiring switches, relays, and power transistors. Stay away from instant-on soldering irons. For any application other than soldering large-gauge wires they put out far too much heat.
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VOLT-OHM METER
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Supplement your soldering iron with these accessories:
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I Soldering stand. This is useful for keeping the soldering pencil in a safe, upright posi-
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I Soldering tip assortment. Get one or two small tips for intricate printed circuit board
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work and a few larger sizes for routine soldering chores.
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I Solder. Don t buy just any kind of solder; get the resin or flux core type. Acid core and
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silver solder should never be used on electronic components.
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I Sponge. Sponges are useful for cleaning the soldering tip as you use it. Keep the sponge
damp, and wipe the tip clean every few joints.
I Heat sink. Attach the heat sink to sensitive electronic components during soldering. It
draws the excess heat away from the component, so it isn t damaged. (See 6.)
I Desoldering vacuum tool. This is useful for soaking up molten solder. Use it to get rid
of excess solder, remove components, or redo a wiring job.
I Dental picks. These are ideal for scraping, cutting, forming, and gouging into the work. I Resin cleaner. Apply the cleaner after soldering is complete to remove excess resin. I Solder vise. This vise serves as a third hand, holding together pieces to be soldered so
you are free to work the iron and feed the solder. Read 6, Electronic Construction Techniques, for more information on soldering.
Volt-Ohm Meter
A volt-ohm meter, or multitester, is used to test voltage levels and the resistance of circuits. This moderately priced tool is the basic prerequisite for working with electronic circuits of any kind. If you don t already own a volt-ohm meter you should seriously consider buying one. The cost is small considering the usefulness of the device. There are many volt-ohm meters on the market today. For robotics work, you don t want a cheap model, but you don t need an expensive one. A meter of intermediate quality is sufficient and does the job admirably at a price of between $30 and $75 (it tends to be on the low side of this range). Meters are available at Radio Shack and most electronics outlets. Shop around and compare features and prices.
DIGITAL OR ANALOG
There are two general types of volt-ohm meters available today: digital and analog. The difference is not that one meter is used on digital circuits and the other on analog circuits. Rather, digital meters employ a numeric display not unlike a digital clock or watch. Analog meters use the older-fashioned but still useful mechanical movement with a needle that points to a set of graduated scales. Digital meters used to cost a great deal more than the analog variety, but the price difference has evened out recently. Digital meters, such as the one shown in Fig. 3.2, are fast becoming the standard. In fact, it s hard to find a decent analog meter these days.
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FIGURE 3.2 A volt-ohm meter (or multitester) checks resistance, voltage, and current. This model is digital and has a 3 1/2-digit liquid crystal display (LCD) readout.
AUTOMATIC RANGING
Some volt-ohm meters, analog or digital, require you to select the range before it can make an accurate measurement. For example, if you are measuring the voltage of a 9-volt transistor battery, you set the range to the setting closest to, but above, 9 volts (with most meters it is the 20- or 50-volt range). Auto-ranging meters don t require you to do this, so they are inherently easier to use. When you want to measure voltage, you set the meter to volts (either AC or DC) and take the measurement. The meter displays the results in the readout panel.
ACCURACY
Little of the work you ll do with robot circuits will require a volt-ohm meter that s superaccurate. A meter with average accuracy is more than enough. The accuracy of a meter is the minimum amount of error that can occur when taking a specific measurement. For example, the meter may be accurate to 2000 volts, plus or minus 0.8 percent. A 0.8 percent error at the kinds of voltages used in robots typically, 5 to 12 volts DC is only 0.096 volts. Digital meters have another kind of accuracy. The number of digits in the display determines the maximum resolution of the measurements. Most digital meters have three and a half digits, so they can display a value as small as .001 (the half digit is a 1 on the left side of the display). Anything less than that is not accurately represented; then again, there s little cause for accuracy higher than this.
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