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CHAPTER 5 Starting with Electronics
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without connecting. Crossed lines will not have a dot, or may even have a little arch in them so that they obviously cross. Each component in a schematic has its own symbol. Note that European and American schematics tend to use di erent symbols. We focus on the American symbols. The symbol above the label LED1 is for a light-emitting diode. Component labels tend to follow a simple convention. LEDs are LED, resistors are named R, capacitors C, switches S, and so forth. The number after the name is just a counter, 1, 2, 3, to keep the various parts separate. Schematics usually come accompanied by a parts list that gives values for all of the names. The values may also be printed on the schematic, like the 330-ohm resistor on the right. Switches and relays, which are just electrically triggered switches, are normally drawn in their unactuated or default position. As we introduce various components in the projects, we shall show their schematic symbol and name, as well as what they look like physically.
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If a circuit is going to be of any use, the lines and components in the schematic need to be translated into physical reality. Most electronic circuits that you nd in the wild are assembled on printed circuit boards (PCBs), or just circuit boards. The circuit board for our schematic is shown in Fig. 5-2. Most PCBs are created photographically. The special ber board begins its life covered on one or both sides with copper. A photoresist mask is applied to this and then a picture of the circuit is projected onto it. Most of the mask is then washed o , leaving mask over just the traces. A strong acid is used to dissolve the rest of the copper o of the board. When that is done, holes can be drilled for the components and the board is done. The traces on the board are wires. Flat wires, but still the same thing as the wires you are used to. The pads are round or oval areas where components are inserted into the board and soldered into place. The process of soldering is described later. Cheap circuit boards have copper on just one side, or maybe on both sides, but no copper in the holes. Better circuit boards have plated holes, where copper is plated into the holes on the board. This copper plating connects to the solder pad and makes it easier to solder components into the board.
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Fig. 5-2.
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Plated holes are also stronger and the pads are less likely to lift o the board. The copper is held onto the board with glue, but too much heat during soldering can melt the glue and cause the pad and traces to lose their grip on the board. If there is copper on both sides of the board, plated holes also do a good job of connecting the pads on the top and bottom sides of the board. There may even be plated holes in the board that aren t for components, used to connect traces between the front and back. These are called vias. Some circuit boards have more than two layers of copper. These multilayer boards are like several two-layer circuit boards glued, or laminated, together. In these cases the vias are critical for connections between one layer and the next. While a professional circuit board is created using computer-aided design (CAD) software, you can also make them by hand using either a chemical photoresist or stick-on resist pads and traces. I don t personally recommend these kits, since good results can be hard to achieve and the chemicals are particularly nasty. To do your own professional schematic layout and circuit board design, I recommend the freeware version of Eagle, from CADSoft. For not too much money, you can even nd companies that specialize in creating prototype circuit boards. My favorite prototype board manufacturer is Alberta Printed Circuits in Canada, but there are others listed later which also do good work.
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