Experiment 18 - Logic with NAND Gates II

4. The OR Gate

A OR circuit with NAND gates. (Enlarge)

Circuit diagram OR gate with NAND gate.

5. The NOR Gate

To obtain a NOR gate, you only need to add one NOT gate behind your OR gate.

6. The XOR Gate

A XOR circuit with NAND gates. (Enlarge)

Circuit diagram XOR gate with NAND gate.

7. The XNOR Gate

To obtain a XNOR gate, you need to add again a NOT gate behind the XOR gate. This circuit you cannot build since the C-MOS IC 4011 provides only four NAND gates. But it certainly has become clear that you can actually build all the gates only unsing NAND gates.

In the next experiment you compare how you built the basic gates using NOR and NAND gates. You will notice some striking similarities.