The NOR gate
Next is the NOR gate.
As can be seen from the symbol, this gate is made of the full symbol of the OR gate and the small circle of the NOT gate. The circle inverts the output.
This gate is used when a logical FALSE is required when any input is high. and a logical TRUE only when all inputs are low.
An example of this could be to light an indicator on a machine to tell the operator that the input hoppers for a machine are all empty.
As can be seen from the symbol, this gate is made of the full symbol of the OR gate and the small circle of the NOT gate. The circle inverts the output.
This gate is used when a logical FALSE is required when any input is high. and a logical TRUE only when all inputs are low.
An example of this could be to light an indicator on a machine to tell the operator that the input hoppers for a machine are all empty.
A schematic for this gate is below. Of note is that this is the same circuit as the OR gate with a transistor added to invert or NOT whatever comes out of the OR part of the circuit.
The truth table for this gate. The table shows the exact opposite output when compared with the OR gate.
| A | B | Output |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
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