Chapter five
Digital logic
Objectives
The objectives of this chapter are that, after studying it, the reader should be able to:
- Recognise the symbols used for the logic gates AND, OR, NOT, NAND, NOR and XOR, and use such gates in applications, recognising the significance of logic families.
- Explain how SR, JK and D flip-flops can be used in control systems.
- Explain the operation of decoders and the 555 timer.
5.1 Digital logic
Many control systems are concerned with setting events in motion or stopping them when certain conditions are met. For example, with the domestic washing machine, the heater is only switched on when there is water in the drum and it is to the prescribed level. Such control involves digital signals where there are ...
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