This document describes designing a NOR gate circuit using transistors, diodes, resistors, and switches to understand its working. The circuit consists of two input switches, two diodes, an LED, a transistor, resistors and a battery. It explains how current flows through the circuit depending on the input switch combinations, following the NOR gate truth table. The output is high only when both switches are released, and low in all other cases, demonstrating the NOR gate function.