Logic Gates
Digital circuits are built from a handful of logic gates. Pick a gate, toggle the inputs A and B, and watch the output and the full truth table update live. This is the hands-on companion to the Digital Concepts reference — it trains the Associate CET competencies 13.1 (identify gates) and 13.2 (construct truth tables).Understanding Logic GatesA clear walkthrough of how each gate works and how to read its truth table.external video · opens in a new tab
Logic Gate Playground
Choose a gate below, then flip the inputs. The schematic redraws, the OUTPUT lights up, and the matching row in the truth table highlights so you can connect the symbol to its behavior.
Truth Table
Circuit Tracer
The Playground shows one gate. Real exam questions wire several together — and the usual trap is losing track of which gate does what halfway through. Here every wire shows its live 0 or 1, and the signal lights up stage by stage, so you never have to hold a value in your head. Pick a circuit, flip the inputs, and follow it left to right.
Reading it: a logic gate takes its inputs and produces one output by a fixed rule. Chain them and one gate's output becomes the next one's input — that chain is what a truth table captures for the whole circuit. The half-adder pairs an XOR (the sum) with an AND (the carry) to add two bits.