Online Digital Logic Circuit Simulator

Logic Gates — All Standard Types

Simulate every fundamental gate in digital electronics: AND, OR, NOT, NAND, NOR, XOR, XNOR, plus high-density 3-input variants (AND3, OR3, NAND3). Build half-adders, full-adders, comparators, and encoder circuits from scratch. Because NAND and NOR are universal gates, you can construct any logic function using only those — the same principle behind modern CPU and FPGA design.

Sequential Circuits — Flip-Flops & Latches

Build and simulate all four standard flip-flop types:

• SR Flip-Flop — Set-Reset latch for basic memory storage
• D Flip-Flop — Data / delay edge-triggered register
• JK Flip-Flop — Universal edge-triggered flip-flop with toggle mode
• T Flip-Flop — Toggle flip-flop ideal for binary counters

All flip-flops are fully edge-triggered with stable state retention — perfect for studying sequential logic, finite state machines, and shift registers.

Multiplexer & Demultiplexer (MUX / DEMUX)

Configure 2-to-1, 4-to-1, or 8-to-1 multiplexers and matching demultiplexers via the interactive MUX/DEMUX configurator. Select line bits and port sizing are adjustable in real time — ideal for studying data routing and combinational logic design.

BCD to 7-Segment Display Decoder

Connect a 4-bit BCD input to the 7-segment display output component and watch it decode digits 0–9 in real time. This is one of the most searched topics in digital electronics coursework — and here you can simulate it interactively without any hardware.

Real-Time Logic Oscilloscope (Scope)

Attach the logic analyzer / oscilloscope component to any wire and capture live signal waveforms. Zoom in and out on the time axis, measure estimated signal frequency, duty cycle, and captured sample count. Drag to select and zoom into any region of the waveform — essential for analyzing clock sources and sequential circuit timing.

Configurable Clock Source

Add a clock pulse generator to your circuit and configure its frequency (0.1 Hz to 10+ Hz) and duty cycle (10%–90%) via the interactive configurator. A live waveform preview updates as you drag the sliders — making it easy to study clocked flip-flop behavior and synchronous circuits.

Professional Design Capabilities

• Bi-Directional Logic Engine: Input a Boolean expression to generate a circuit, or draw manually to derive the expression — works both ways instantly.
• Hot-Swap Gate Replacement: Drag any gate from the parts bin and drop it onto an existing gate to swap logic types while keeping all wire connections intact.
• Infinite Canvas with Zoom & Pan: Design large, complex circuits with smooth scroll-wheel zoom and middle-mouse / spacebar panning.
• High-Resolution Export: Export your finished schematic as a clean image suitable for lab reports, assignments, and documentation.

Component Library

• Inputs: Toggle Switch, Momentary Push Button, Configurable Clock Source
• Basic Gates: AND, OR, NOT
• Advanced Gates: NAND, NOR, XOR, XNOR, AND3, OR3, NAND3
• Sequential: SR-FF, D-FF, JK-FF, T-FF
• Combinational: MUX (2/4/8-to-1), DEMUX (1/2/4-to-8)
• Outputs: LED Probe, BCD 7-Segment Display, Logic Oscilloscope

Signal Visualization

Wires dynamically reflect logic state: Red = High (1), Grey = Low (0). The high-contrast neon wire style makes it immediately obvious where signals are active or grounded — ideal for debugging complex circuits.

De Morgan's Theorem — Interactive Proof

Verify De Morgan's Laws directly on the canvas. Build both sides of the equivalence:

Because NAND and NOR are universal gates, every other logic function can be derived from them — the foundation of modern CPU, FPGA, and SSD architecture. Test this principle hands-on with no hardware required.