Armed with a functional inverter, the next step was an OR gate. By combining NOT and OR gates, you can easily make a NAND gate, an AND gate, a NOR gate, and any other logic you can dream up.

Digital logic circuits generally have input power ... shows him creating a number of equivalent circuits starting with an inverter and working his way up to a half adder and an RS flip-flop.

A PWM-controlled regulator, this time using a logic gate IC, op-amp, and resistors and capacitors to buffer the PWM signal.

1 NAND inverting gate and AND non-inverting gate Standard ... So, It would be inefficient to use an inverter when the inversion can be optimized away in the logic by using an inverting logic function ...