Input-A is connected to the drain terminal of MOSFET; Input-B to its gate terminal. The source terminal, labeled as Output-C, is the output of the AND gate. The MOSFET in the circuit is either ...

The challenge was to reduce the number of transistors. The schematic from the ... Adding two 1N914 diodes and an AND gate ahead of the inverter create a two-input NAND gate. With the two diodes ...