This is the OR gate circuit, but with added components to make a NOR gate. Here, the blue wire is the X input and the red wire is the Y input. The LED's (right and left) represent the outputs. For the NOR gate to be open, both X and Y have to have no input (9v) -- the right LED is on. If either inputs (X or Y), have an input of 9v then the gate stays closed -- right LED is off.
A third type of gate (not shown) is called a NOT gate or inverter that is just the opposite of its input. So, if the input is low, the output is high. And, if the input is high the output is low.
The combinations of resistors and transistors that create different logic gates such as OR, NOR, and NOT, to name a few, are the basic building blocks for computers.
The combinations of resistors and transistors that create different logic gates such as OR, NOR, and NOT, to name a few, are the basic building blocks for computers.
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| X and Y have input right-LED off: gate closed |
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| X has 9v input Y has no input right-LED off: gate closed |
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| X has no input Y has 9v input right-LED off: gate closed |
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| X and Y have no input right-LED on: gate open |
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| Schematic Symboles |
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