___________________________________________________________________________ Transistors
elimination of terminal boards, fittings, tie points, and wires, results in a substantial
reduction in the overall size of electronic equipment.
Figure 2-23. Typical Printed Circuit Board
2-106. After the PCBs were perfected, efforts to miniaturize electronic equipment were
then shifted to assembly techniques, which led to MODULAR CIRCUITRY. In this
technique, PCBs are stacked and connected together to form a module. This increases the
packaging density of circuit components and results in a considerable reduction in the size
of electronic equipment. Since the module can be designed to perform any electronic
function, it is also a very versatile unit. However, the drawback to this approach was that
the modules required a considerable number of connections that took up too much space
and increased costs. Tests also showed the reliability was adversely affected by the
increase in the number of connections.
23 June 2005
TC 9-62
2-33
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