All electronic equipments can be considered as systems comprising a set of interacting elementsresponding to inputs to produce outputs. It is quite possible that a system may be too complex to beanalysed in detail. It is therefore, necessary to divide it into sub-systems and then integrate them.Each sub-system would then represent a functional block, and the combination of all the blockswould constitute the functional ‘Block Diagram’ of the equipment. A block is only a ‘black box’with certain inputs and outputs, but performing a definite function. The lines interconnecting theseblocks indicate the signal flow from block to block or circuit to circuit. Understanding of the circuitfunction becomes easy with a block diagram. Figure 3.1 shows a typical block diagram representationof a simple recorder.The integrated circuits such as microprocessors, counters, etc. are represented as individual blocks.These blocks are labelled with pin numbers, signals and associated interconnecting wires.
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