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7.2 Breadboards
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The term breadboard is used for a variety of experimenter wired circuit products. In this book, the term will be used to describe the temporary prototyping circuit platform shown in Fig. 7-3 in which the holes are connected to adjacent ones by a spring-loaded connector. The typical arrangement is to have the interior holes connected outward while the outside rows of holes are connected together to provide a bus structure for power and common signals. Wire (typically 22 gauge) and most electronic components can be pushed into the circuit to make connections and, when the application is finished, to pull out for reuse. Breadboards are engineered to enable you to experiment with a circuit, without the trouble of soldering. When you are assured that the circuit works, you may use one of the other four construction techniques described in this chapter to make the design permanent. A typical solderless breadboard mounted on a metal carrier is shown in Fig. 7-4. Breadboards are available in many different sizes and styles, but most provide rows of common tie points that are suitable for testing ICs, resistors, capacitors, and most other components that have standard lead diameters. It is a good idea to first test all the circuits you build on a solderless breadboard. It is important to note that the resistance between adjacent pins is on the order of 5 and the
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Interior Connections
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FIGURE 7-3 Breadboard with interior connections shown.
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7.3 PROTOTYPING PCBs
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FIGURE 7-4 Use solderless breadboards to test out new circuit ideas. When they work, you can construct a permanent circuit.
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capacitance between connectors can be as high as 2 pF. These parasitic impedances mean that your circuit may not perform properly in all cases (especially for currents over 100 mA or signals switching at a few MHz) and you may have to resort to one of the other prototyping methodologies described in the following. It should also be noted that breadboard component connections can come loose when under vibration such as in a mobile robot.
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7.3 Prototyping PCBs
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There are many different commercial products that allow you to solder together a custom circuit reasonably quickly and easily. These products may have generic names like breadboard circuit boards, universal solder boards, or experimenters PC boards. The Vector line of products is commonly used by many robot experimenters. These boards consist of a series of copper strips (which can be cut) to allow you to create custom circuits surprisingly
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ELECTRONIC CONSTRUCTION TECHNIQUES
easily using standard PCB soldering techniques. Other prototyping PCBs have sockets and commonly used circuits already etched into the PCBs to further simplify the assembly and wiring of the circuit. The main disadvantage of universal solder boards is that they don t provide for extremely efficient use of space. It can be difficult to cram the components onto a small space on the board, and you will find that it takes some experience to properly plan your circuits. For this reason, only use prototyping PCBs when wiring a fairly small and simple circuit. Remember to drill mounting holes to secure the board in whatever enclosure or structure you are using.
7.4 Point-to-Point Prototyping Wiring
Point-to-point wiring refers to the practice of mounting electronic components to a prototyping PCB and connecting the leads together directly with solder. This technique was used extensively in the pre-IC days and was often found on commercial products. An example of a circuit built on a prototyping PCB and connected together using point-to-point wiring is shown in Fig. 7-5. When building point-to-point wired circuits, you must be careful to use insulated wire as point-to-point construction invites short circuits and burnouts. Point-to-point wiring is the most difficult method of creating circuitry discussed in this chapter, but often it is the only
FIGURE 7-5 Circuit created on a prototyping PCB and wired together using point-topoint wiring techniques.
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