Learn electronics by building real circuits.
Guided lessons on a live circuit simulator, right in your browser. Every check measures the circuit you actually built.
The 10-module intro course is free with an account. It runs on school Chromebooks.
Press the pushbutton to light the LED.
A real lesson bench: the circuit above is being solved in your browser right now.
How a lesson works
No videos and no quizzes. A lesson is a working circuit with a guide beside it, and you pass by making the circuit work.
Read the step
Each module teaches one idea in plain language, right beside the board. This is module two, as students see it:
Your task
The resistor is already connected to the Vcc rail and the LED's anode. You need to:
- Wire the LED's cathode (K, shorter leg) to the GND (blue) rail.
- Watch the LED light up as the circuit becomes complete.
- Confirm the branch current is between 2 mA and 20 mA (safe range).
Build it on the board
Drag parts from the palette and wire them up. The simulation runs the whole time, so the circuit behaves while you build.
Pass by measurement
An objective passes when the electricity says so. Any correct build counts, wherever you place the parts.
Wire the resistor and LED in series.
Make the LED light up.
Keep the LED current between 2 mA and 20 mA.
measured: 14.5 mA
Introduction to Electronics
One continuous build across ten modules. The LED you wire in module two is still on the board when module ten hands it to a 555 one-shot timer.
10 modules · 135 min
- 01Introduction to Solderless BreadboardsBreadboard basics12 min
- 02Wire a Single LED with a ResistorOhm's law10 min
- 03Control the LED with a PushbuttonMomentary switches10 min
- 04Build a Latching On/Off LED SwitchLatching state8 min
- 05Add a Second LED in ParallelSeries vs parallel12 min
- 06Make a Capacitor Fade an LED On and OffRC timing15 min
- 07Use a Transistor to Switch a Brighter LEDTransistor switching15 min
- 08Build a Capacitor Delay with a TransistorTimed switching18 min
- 09Wire a Manual Traffic Light with Red, Yellow, and Green LEDsCombining branches15 min
- 10Build a One-Shot Timer with the NE555 (Monostable)Capstone build20 min
Written for complete beginners: it starts with what a breadboard is. When you are ready for more, the Logic Gates course continues into digital logic on real 74LS ICs.
Run it with a class
Educator access is set up by de:volt. Once your school is live, put the join code on the board: students sign in and join themselves, with no student email setup.
- Live classroom sessions
- Start a session and the class moves together. You advance module by module, and each student's objective progress lands on your console as they work.
- A tracker for take-home work
- The progress board covers every student and every assigned module, down to individual objectives. Not started, in progress, or done, at a glance.
- Assignments with rubrics
- Mix auto-checked criteria with ones you score yourself. Marking re-runs each submitted circuit in the simulator, so auto-checks are verified rather than self-reported.
- Modules you write yourself
- The Module Creator works without code. Build the finished circuit, mark which parts students should build, write the lesson, and choose objectives. Everything is validated before you can publish.
Join code
KQ7F2MAn example, safe to try the copy button on.
Maya Chen
just nowLED current limitsModule complete
Jordan Patel
18s agoLED current limitsOn module
Console tiles during a live session, with example students.
Good to know
- What do you need?
- Any modern browser, including school Chromebooks. Nothing to install and no kits to buy.
- Is it free?
- The Introduction to Electronics course is free with an account. Sign in with an email link or with Google.
- Is the simulation real?
- Yes. Lessons run the same engine as the de:volt simulator. The pushbutton at the top of this page went through it.
- Where does my progress go?
- It saves to your account automatically. Every objective you pass, and the circuit you finish each module with, are there when you come back.
Start with a single LED.
The first module takes about twelve minutes. Nine modules later, that LED is firing single one-second pulses from a 555 timer.