CircuitJS1

Electronics simulator

Watch current flow like little dots of light through the circuit you build.

Make it mineTry it (opens the authors’ own copy in a new tab)

“Make it mine” asks you to sign in first. On the Free plan, your copy is your one app; you can delete it any time.
“Try it” opens the authors’ own copy, not yours.

Made by
pfalstad
Licence
GPL-2.0-or-later
Popularity
2.4k stars on GitHub
Uses
Your browser

What you can do

  • Drag parts onto the page and wire them together
  • See voltage waves on a built-in oscilloscope
  • Pick one of hundreds of example circuits and change it

Who it’s forPhysics and electronics students, teachers and hobbyists

Once it’s yours

  • Your own copy, at its own address
  • Anyone with its address can open it, until you choose who can
  • Change it with your own coding agent

Ideas for changing it

Once it’s live, give any line below to your coding agent.

  • Open with the circuit from today's lesson

  • Slow the current dots down so students can follow them

  • Switch to a white background so it's clearer on a projector

Source and licence

CircuitJS1 is open source: its authors, pfalstad, published the code for anyone to use and change.

Its licence, GPL-2.0-or-later, lets you use and change it for free; when other people use your changed version, you share your changed code with them.

Your copy is the version you copied; the authors’ later updates don’t arrive by themselves.

This version on TofuThe authors’ original code

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