With the two diodes reversed and a 910 Ohm resistor removed, a NOR gate is created. The next step was to build a S-R latch using the NAND gates and inverters, which holds some basic memory.

Since the OR gate only needs to output '0' when both of the two inputs are '0', it is OK if the value inverted by the NAND gate is output to the AND gate and then inverted.

Recently, [Manuel] did a post on making logic gates out of anything. He mentioned a site about relay logic. While it is true that you can build logic gates using switch logic (that is, two switches… ...

CMOS devices have large input impedance with input currents on the order of 0.01nA. Adding feedback circuitry can result in a latch-like device that can be used to store bits, and also operate in a ...

Figure 3 Two-input NAND gate (a), and MOSFET realization (b) For a more analog MOSFET application, consider this simple AM modulator. Figure 4 MOSFET amplitude modulator The circuit consists of an ...