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Learn Electronics Online

Free interactive lessons. Every topic includes a live circuit you can simulate and experiment with directly in your browser.

✨ NEW AI TOOL

AI Circuit Explainer

Describe any circuit — get an instant plain-English explanation of how it works. Free, no signup on our site.

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// learning paths
Choose Your Level
Beginner
Electronics Fundamentals
Start here if you're new to electronics. Learn voltage, current, resistance and basic components.
01 Ohm's Law — Voltage, Current & Resistance SIMULATE 02 Resistors in Series and Parallel SIMULATE 03 Voltage Dividers SIMULATE 04 Capacitors and RC Circuits SIMULATE 05 Logic Gates (AND, OR, NOT) SIMULATE
Intermediate
Analog & Active Circuits
Transistors, op-amps, oscillators, and amplifiers. Take your understanding further.
01 Transistor Switch Circuit SIMULATE 02 Op-Amp Amplifier Configurations SIMULATE 03 555 Timer — Astable & Monostable SIMULATE 04 Active Filters SIMULATE 05 Flip-Flops & Counters SIMULATE
Advanced
Power & Digital Systems
Power converters, phase-locked loops, microcontroller interfacing, and more.
01 Buck & Boost Converters SIMULATE 02 Analog-to-Digital Converters SIMULATE 03 Phase-Locked Loops SIMULATE 04 Digital Communication Circuits SIMULATE 05 CMOS Logic Families SIMULATE
// AI TOOL

Don't Understand a Circuit?

Paste any circuit description into our AI Circuit Explainer and get a step-by-step plain-English explanation. Free, and it opens ready to go in ChatGPT.

Try AI Circuit Explainer →

Frequently Asked Questions

Can I learn electronics for free online?

Yes. FreeCircuitSim provides free interactive electronics lessons from beginner to advanced level. Each lesson includes a live circuit simulation you can modify and experiment with directly in your browser. No account or download needed.

What is the AI Circuit Explainer?

A free tool that turns your circuit description into a ready-made prompt for ChatGPT, which then explains in plain English what the circuit does, how it works and any key calculations. You can also copy the prompt into Claude, Gemini or Copilot. No signup is needed on FreeCircuitSim.