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A NOT gate (also often called Inverter) is a logic gate. Each NOT gate has only one input signal. Logically with NOT gates, the input and the output swap, so if you input 1 it outputs as 0; likewise if you input 0 it outputs as 1.
Generally, actual NOT gates with a voltage below 0.5V is 0, and a voltage of 4–5V is 1.
Symbols[change | change source]
There are three symbols for the NOT gate:
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