Learn
Understand how circuits work, from the very first idea.
Free · visual · zero to intermediate
Electronics you can see.
Learn by experimenting. Watch current flow, turn the knobs, and check every number against the equation behind it. From “what is electricity?” to transistors, op-amps, logic and a real Arduino.
- Free
- No account
- Works offline
- Nothing tracked
Welcome back
Where do you want to start?
Completely newStart at chapter 1What electricity is, in ten minutes, with a live circuit. Then follow the course in order.
I know the basicsPick from the roadmapEvery lesson in order, with times and what to read first. Jump in anywhere.
I want to buildGet hands onThe breadboard trainer and sandbox, then real projects with a 555 or an Arduino.
I teachOpen the teacher packA ten-session plan, printable lab sheets and a private class progress summary.
Explore
Five areas. Every page is also in the menu at the top.
Build
Experiment with circuits that answer back.
Projects
Real builds and real hardware.
Practise
Make it stick with short, regular practice.
Teach
Everything for a class or a club.
What’s new
All updatesThree tools worth trying first
Circuit sandboxBuild any circuit and watch it solved live: every voltage, every current, and the warnings a real circuit would give.
Breadboard trainerPlace parts leg by leg, see which holes connect, and let it check a real build from your meter readings.
Hardware labPlug in an Arduino and compare real measurements with the models, live in the browser.
The learning path
Full roadmapHow this site works
Simplified on purpose
Every simulation uses a small, stated model, written next to it. They teach the idea and give realistic numbers, but a real circuit can behave differently.
Build safely
Batteries, USB power or bench supplies of 12 V or less. Never work on mains electricity: leave anything plugged into the wall to qualified people.
Private by design
No accounts and no tracking. Your progress stays in this browser; move it with a progress code if you want to.