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Digital Electronics · Virtual lab

Digital Logic Workbench

A hands-on breadboard you can actually wire. Drop logic-gate chips onto the board, run jumper wires from switches and the +5V rail to gate inputs, fan outputs into LEDs, then press START and flip the switches to watch your circuit compute. Modelled on the IIT-Guwahati Virtual Labs “Half Adder using Logic Gates” breadboard experiment — same apparatus, smoother wiring.

1 Open Components & click a gate to drop a chip 2 Drag a chip by its body to reposition 3 Click an output pin, then an input pin, to lay a wire 4 Press START and flip the switches 5 Click a wire to delete it
Preset Power off

Components

Tip: A chip lights its pins green when that net is logic 1. NOT has a single input.

Truth table

Build or load a circuit to sweep its inputs.
logic 1 logic 0

Bench status

Idle. Power is off.
Wiring rule: each gate input and each LED accepts one wire; an output, switch or rail can feed many.

How the simulation works. Every chip is evaluated from the nets feeding its input pins. The solver re-runs the whole board up to 50 times per change so feedback circuits (like the SR latch) settle to a stable state; an unconnected input reads as logic 0. The truth table is produced by sweeping the input switches over all 2n combinations and recording each LED — so the bench doubles as a verifier. Reference apparatus: Digital Electronics Virtual Lab, IIT Guwahati.