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Starting electronics<br />

Figure 10.45 An incomplete truth table for you to record your results<br />

Figure 10.46 A completed truth table for the circuit in Figure 10.43 — showing<br />

how we have made a NOR gate from an AND gate with NOT gates at its inputs<br />

And, for the sake of completeness, Figure 10.47 shows a three<br />

input AND gate with NOT gates at its inputs, and the circuit’s<br />

truth table, to show that we can make a NOR gate of any<br />

number if inputs from an AND gate of that number of inputs<br />

together with the requisite number of inverters.<br />

On the other hand, of course, and even better than this, by<br />

the same means of deduction we used for other circuits combining<br />

logic gates, we can calculate that the standard NOR<br />

Boolean statement:<br />

is also the same as another Boolean statement:<br />

238

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