Lab time is limited. Practice shouldn’t be.
LogicBench started from a simple frustration: digital logic labs are only open a few hours a week, but the days before an exam or a lab practical are when you actually need to sit with a circuit and figure out why it isn’t working. Without 24/7 lab access, most students are left re-reading theory instead of actually building anything.
So I went looking for a tool that could fill that gap — something with the full 74xx logic family, real safety and burn physics, and no artificial limits on what you could wire. I couldn’t find one. Most simulators online cover a handful of gates, skip real component behavior entirely, or just aren’t built for how a digital logic lab actually works. So I built it myself.
LogicBench began as a simple breadboard simulator. Once it was out, the response from students and educators around the world made it obvious this needed to be more than that. The IC library kept growing. Then came a real Arduino environment with its own C++ compiler, LCD displays, custom batteries, resistors, and more. What started as one tool for one problem is now a complete electronics bench — and it’s still growing.
Who LogicBench is built for
A few different people open LogicBench for a few different reasons — but they all run into the same wall: not enough access to real hardware, real lab time, or a safe place to make mistakes.
Students preparing for DLD labs and exams
If you don't have 24/7 lab access, LogicBench is where you practice the circuit you'll be tested on — wiring it, breaking it, and understanding why, before it counts.
University professors, lab engineers, and instructors
A safe place to walk students through digital logic concepts without risking real lab components. Let a mistake burn a simulated chip instead of a real one.
Students working on DLD and electronics projects
Not sure if your circuit will actually work, or which components you need? Build it in LogicBench first. If it works here, it's built to behave like it will on real hardware.
Electronics enthusiasts on a budget
Prototype and validate a circuit fully before spending money on real components — so you buy hardware once, knowing it'll work, instead of guessing.
Hobbyists & makers building real projects
Whether you're designing a DIY alarm system, a binary counter display, or an Arduino-powered sensor array — use LogicBench as your virtual prototyping bench before committing to real parts.
Self-taught learners & online course students
Following a course on digital electronics or embedded systems? LogicBench is the hands-on complement — wire the circuit from the lesson and watch it run in simulation, reinforcing what you just learned.
What makes it different
LogicBench is built to behave the way real hardware does — so what you learn and build here actually transfers to a real breadboard.
Built on real physics, not approximations
Supply 20V to a circuit designed for 5V in LogicBench, and every component on that path burns out — exactly like it would on your bench. Use that to find the safe resistor and capacitor values before you ever touch real hardware.
If it works in LogicBench, it works in real life
The simulator is designed specifically to match real-world component behavior. Validate your full circuit here, then buy the hardware and wire it exactly as you did on screen.
Sub-circuits — build once, reuse anywhere
Build a half adder, save it as a sub-circuit, and drop it into the load menu any time you need it — for example, combining two half adders into a full adder without rewiring from scratch.
Wire planning for clean, gradeable circuits
Plan your wire paths before you commit, so your final layout is neat instead of a tangle — the difference between a messy submission and full marks on a project.
Real Arduino compilation, not simulation theater
Your Arduino sketch is actually transpiled and compiled by a real C++ engine — not pattern-matched against a list of known examples.
Datasheet accuracy across the full 74xx family
Pin layouts and logic behavior for 34 TTL ICs (and growing) are modeled against real datasheets, not approximated.
What you can build in LogicBench
LogicBench is a general-purpose digital electronics simulator. These are some of the circuits and projects people build in it every day.
Combinational logic circuits
- ▸Half adder & full adder
- ▸4-bit ripple carry adder
- ▸BCD to 7-segment decoder
- ▸Priority encoder
- ▸Multiplexer-based logic functions
- ▸Comparator circuits
Sequential logic circuits
- ▸SR latch & D flip-flop
- ▸JK flip-flop counter
- ▸Mod-N counters
- ▸Shift registers
- ▸Ring counter & Johnson counter
- ▸Sequence detector FSM
Arduino projects
- ▸LED blinking & PWM dimming
- ▸LCD display with I2C
- ▸Traffic light controller
- ▸Ultrasonic distance meter
- ▸7-segment counter display
- ▸Servo motor control
Hobby electronics projects
- ▸555 timer astable oscillator
- ▸Tone & frequency generator
- ▸Binary clock circuit
- ▸Logic puzzle game
- ▸Relay driver circuit
- ▸Signal debouncer
The 74-series IC library
34 datasheet-accurate 74xx TTL ICs are included in LogicBench — and the library is growing. Each IC is modeled at the gate level with the correct pin assignments, so circuits you wire here wire identically on a real DIP breadboard.
7400
Quad NAND
7402
Quad NOR
7404
Hex inverter
7408
Quad AND
7432
Quad OR
7474
Dual D flip-flop
7483
4-bit adder
7486
Quad XOR
74138
3-to-8 decoder
74148
8-to-3 encoder
74151
8-to-1 MUX
74163
Sync counter
Need an IC that isn’t listed? Request it — most ICs are added within 24 hours.
A library that grows with its users
As far as we know, LogicBench is the only platform offering live, direct support like this — no other simulator we’ve found commits to adding a requested component within 24 hours.
Request a component
Need an IC, sensor, or module that isn’t in LogicBench yet? Email us — most requests are added within 24 hours.
Request a component →Join other builders
Share circuits, ask questions, and help shape what gets built next in the LogicBench community.
Join the community →Support development
LogicBench is built and maintained independently. If it’s helped you, consider chipping in to keep it going.
Support the project →