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9.1 Why Prototype
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An important questions could be raised at this stage. Why prototype the design at all What does prototyping the design gain you After all, you may have to make the PCB for the design anyway Why not go directly for the final PCB Prototyping allows you to test your design and evaluate its performance at a very little cost and rapidly. If you have gone through the process of making a PCB, you will realize
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200 PROTOTYPING TECHNIQUES
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that this time-consuming process of capture, board layout, and fabrication will delay the crucial task of verifying your design. Besides, the design itself may be in a preliminary stage and you may want to add and modify the design and see the performance on a proto board. So prototyping your design is a good idea. For hobbyists, the prototype could be the final design anyway. The importance of design verification while still on the drawing board (or the design board whatever) cannot be overemphasized. It is a good idea to thoroughly check the design while it is still on the paper. Another way to check your design is to simulate the performance of the complete or part of the circuit design on any simulation tool that is available, say a code simulator. However, the prototyping stage of the design will give you one last opportunity to check that the performance is according to specifications and is bulletproof, and hopefully you will be saved the embarrassment of a failed and returned product from the field or from the customer. There is a possible downside to prototyping as well. Many times there is an urge to rush your circuit and see it working as a prototype without giving it much thought while it is in the design stage. It is advisable to control this urge and to prototype the idea when you are satisfied that the design has been well-thought out and suitably simulated. A badly designed circuit that has been rushed to the proto stage could end up in an endless and vicious loop of modify-prototype-test. This must be avoided at all costs.
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9.2 OK, So You Want to Prototype
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There are many ways of prototyping your circuit. For very simple circuits, it is popular to use the protoboard. The protoboard is made of plastic (or some such material) with holes at a 0.1-inch pitch in the form of a regular matrix. The holes in a given row are internally connected. The holes are of a certain diameter that accepts most component leads such as small diodes, resistors, transistors, and ICs in DIP packages, etc. On either side of the protoboard, there are two columns of connected holes that are usually used as a power bus to connect the protoboard to a DC voltage source for energizing the circuit. Figure 9.1 is a photograph of a popular protoboard. To use the protoboard, one simply pushes the components in the holes and makes required connections with suitable single-strand hookup wire. The protoboard is a simple and convenient way to test your circuit. And it does not require you to dirty your hands with the soldering rod. However, the protoboard is not suitable for high-speed applications. The inductive coupling between the rows of connections may produce unwanted and undesirable crosstalk. Another simple method is to use the commonly available general-purpose board made of glass epoxy, the material that the PCB is usually made of. This board, usually referred to as a sea of holes, is available in many formats form many suppliers. Figure 9.2 is a photograph of a general-purpose PCB. This general-purpose circuit board has holes arranged on a 0.1-inch pitch with solder contacts on one side. These boards are also available with many connector pinouts as well, to connect to say a DB-25 connector. Prototyping boards for the PC interface connectors are also available.
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