What is CircuitSim?
A browser-based circuit simulator with a real SPICE engine. Draw a schematic and run an analysis without installing anything.
Britt Espinosa
Last Update hace 15 días
CircuitSim is a circuit simulator that runs in your browser. You draw a schematic, choose an analysis, and the simulator calculates what the circuit does. There is nothing to install or configure before your first run.
What you can build
The component library holds over 3,000 official parts, organized into ten categories: analog, passives, sources, semiconductors, transistors, digital, power, probes, reference, and miscellaneous. You place parts on a canvas, wire them together, and set values on each one.
If a part you need is not in the library, you can author your own. The custom component editor covers the symbol, pins, and SPICE model, and the result behaves like any other component in your circuits.
What the simulator does
CircuitSim runs the same class of SPICE engine used in desktop EDA tools, compiled to run in the browser. Seven analyses are available:
| Analysis | What it answers |
|---|---|
| Interactive | What is the circuit doing right now, while I change it |
| Interactive operating point | What are the steady-state voltages and currents, refreshed as I edit |
| Transient | How does the circuit behave over time |
| AC sweep | How does the circuit respond across a frequency range |
| DC operating point | What are the steady-state voltages and currents |
| DC sweep | What happens as I vary a source across a range |
| Parameter sweep | What happens as I vary a component value across a set of runs |
DC sweep and parameter sweep require a Standard or Premium plan. The rest are available on every plan, including the free one.
Results appear as a chart you can put cursors on, and as a table you can read values out of. Both can be exported.
What else is here
Circuits can stay private to you, or be made public so anyone can open and copy them. You can share a circuit with a group, which is how classes and teams work in CircuitSim.
There is a forum for asking questions, an idea space where you can propose features and vote on other people's, and a public roadmap showing what is being worked on.
What CircuitSim does not do
CircuitSim is a schematic and simulation tool. It does not do PCB layout or simulate microcontroller firmware. Circuits do not save automatically, so you save with Ctrl+S or the save button.
The component library is still growing, and some parts you would find in a desktop tool are not there yet. When that happens, build the part yourself in the custom component editor.
Where to start
Open the editor and place two components. Build your first circuit walks a DC source and a resistor from an empty canvas to a result you can read, and takes about five minutes.