vb.net barcode scanner source code FIGURE 7-2 Use a low-wattage (25 to 30 W) soldering pencil for all electronics work. in Software

Generator Denso QR Bar Code in Software FIGURE 7-2 Use a low-wattage (25 to 30 W) soldering pencil for all electronics work.

FIGURE 7-2 Use a low-wattage (25 to 30 W) soldering pencil for all electronics work.
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Which soldering tip you choose is important. For best results, use a fine tip designed specifically for printed circuit board use (unless you are soldering larger wires; in that case, use a larger tip). Tips are made to fit certain types and brands of soldering irons, so make sure you get ones that are made for your iron. 7.1.2.2 Sponge Keep a damp sponge (just about any type of kitchen sponge will do) by the soldering station and use it to wipe off extra solder. Do not allow globs of solder to remain on the tip. The glob may come off while you re soldering and ruin the connection. The excess solder can also draw away heat from the tip of the pencil, causing a poor soldering job. You ll have to rewet the sponge now and then if you are doing lots of soldering. Never wipe solder off onto a dry sponge, as the sponge could melt or catch on fire. 7.1.2.3 Solder and flux You should use only 63% lead/37% tin rosin core solder. It comes in different thicknesses; for best results, use the thin type (0.050 in) for most electronics work, especially if you re working with printed circuit boards. Never use acid core or silver solder on electronic equipment. (Note: certain silver-bearing solders are available for specialty electronics work, and they are acceptable to use although a lot more expensive than tin lead solders.) You have probably heard about lead-free solders, which, not surprisingly, do not contain any lead in an effort to protect the environment. Unless you are well versed in soldering and are certain that all the components that are going to be soldered have had their leads prepared for lead-free solders, then it is highly recommended that you stay away from them. Lead-free solders melt at a higher temperature than tin lead solders and lead contamination can cause even higher temperature melting points, which will make it very difficult to remove the components. Flux is a weak heat-activated acid that cleans the metal surfaces of the components being soldered of oxides and some contaminants. In some cases, such as soldering large wires, you may find it advantageous to apply liquid flux to the surfaces to ensure the larger areas are cleaned during the solder process. To avoid getting into trouble with liquid flux, only buy flux at the store where you bought your solder and make sure that it is the same formulation as the flux in the solder. There are very aggressive fluxes designed for specialized applications that will literally dissolve your components and solder iron tip. If you aren t sure, then refrain from buying any flux and rub the connections with steel wool before soldering to clean off the surfaces to be soldered. Solder should be kept clean and dry. Avoid tossing your spool of solder into your electronics junk bin. It can collect dust, grime, oil, grease, and other contaminants. Dirty solder requires more heat to melt. In addition, the grime fuses with the solder and melds into the connection. If your solder becomes dirty, wipe it off with a damp paper towel soaked in alcohol, and let it dry. 7.1.2.4 Soldering tools Basic soldering tools include a good pair of small needlenose pliers, wire strippers, and wire cutters (sometimes called side or diagonal cutters). The stripper should have a dial that lets you select the gauge of wire you are using. A pair of nippy cutters, which cuts wire leads flush to the surface of the board, is also handy. A heat sink should be avoided during soldering some people may say that it is necessary to avoid heat damage to components, but a heat sink will raise the length of time the
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