Online Breadboard Simulator in the Browser

An online tool with a virtual 830-point solderless breadboard: plug resistors, LEDs, transistors and buttons into the holes, run colored jumper wires, hook the battery pack to the power rails — and the circuit actually computes: LEDs light up and every part shows its real current and voltage. A virtual breadboard is the bridge between a schematic on paper and building the circuit with your own hands.

How to Use the Breadboard Simulator

1
Power the rails

Add the battery pack and run jumpers from its clips to the + and − rails — exactly like on a real board. The "Show me an example" button assembles a starter circuit for you.

2
Plug in parts and jumpers

Pick a part in the palette and tap a hole — the legs drop into the strips. Use the Jumper tool to connect strips to each other and to the rails.

3
Simulate

Press Simulate: LEDs light from the computed current, parts show live readouts, and wiring mistakes are flagged with friendly hints.

Build circuits on a virtual solderless breadboard — just like the real thing

Components
Power
Passive
Semiconductors
Loads & switching
Logic & ICs
Properties
Tap a part to edit its values. Tap an empty hole to light up every hole connected to it inside the board.
🙌 Thanks

Thanks to the testers whose feedback makes this tool better.

Mr.Sanktum ↗

Features

Real breadboard logic: 5-hole terminal strips and power rails
Every strip of five holes is internally connected exactly like a real 830-point board, with + and − rails running the full length.
Strip-highlight teaching mode
Tap any hole and every hole connected to it inside the board lights up — the fastest way to understand why parts see each other.
Realistic parts: resistors with true color-code bands
Resistor bands are drawn from the actual color code of the value you set; LEDs get a lens with a highlight, transistors a TO-92 body.
Live circuit solving by the same engine as the schematic simulator
DC analysis, transistors with hFE gain, LED-overload and short-circuit warnings — all computed as you build.
A programmable smart block in a DIP package
A six-leg chip with ready-made programs: blink, follow input, chaser, counter — no code required.
Jumper wires, undo history and share-by-link
Colored jumpers like a real kit, full undo/redo, and a link that opens your build ready-made for anyone.

FAQ

What’s the difference between the real and ideal model?

Real includes the resistance of the battery, LEDs and diodes, and wires — the numbers come out like a real board (an LED draws about 18.7 mA instead of an even 20). Ideal zeroes those resistances and gives the clean textbook values. On simple circuits the difference is tiny; on LEDs and low-resistance circuits it is noticeable. Real is the default.

How is this different from the schematic simulator?

A schematic uses abstract symbols. Here you build the circuit physically: legs go into holes and you learn how the strips are connected inside the board. It is the bridge between a paper schematic and a hands-on build.

How is the virtual board organized?

It is a standard 830-point solderless breadboard: rows a–e and f–j of five connected holes separated by the center gutter, plus four power rails along the edges. The electrical logic matches the real thing.

Which parts are available?

A battery pack, a resistor with true color-code bands, an LED, a diode, a capacitor, a push button, an NPN/PNP transistor and a programmable smart block in a DIP package. The set keeps growing.

Does the circuit really compute?

Yes — with the same solver as our schematic simulator: DC nodal analysis, transistors with hFE gain, LED-overload and short-circuit warnings.

Can I save or send my build?

The build is saved in your browser automatically, and the Share button creates a link that opens the assembled board for anyone.

Does it work on mobile?

Yes, the editor is built for touch: tap to place a part, drag to move it hole by hole, pinch to zoom the board.

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Who is this tool for?
🎓 Students 📚 Educators & Teachers 🔌 Electronics Enthusiasts
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