Step 6: Building the Circuit
The complexity of this circuit is much greater than that of the last one, so I am not going to make a schematic for it. But don't fret, because you know how to arrange the MOSFETs to make a NAND gate, and you know how to connect the NAND gates together, so you can build it. To connect the switches, you need to tie the side of the switch connected to the first NAND gates to ground with a 10K ohm resistor. The other side of the switch can be tied directly to positive 5 volts.