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[](https://www.circuitlab.com/) - [My Workbench](https://www.circuitlab.com/workbench/) - [Electronics Q\&A](https://www.circuitlab.com/questions/) - [Textbook](https://ultimateelectronicsbook.com/) [](https://www.circuitlab.com/accounts/login/) [log in](https://www.circuitlab.com/accounts/login/) [sign up](https://www.circuitlab.com/accounts/register/) # Circuit simulation and schematics. ## Build and simulate circuits right in your browser. - Design with our easy-to-use schematic editor. - Analog & digital circuit simulations in seconds. - Professional schematic PDFs, wiring diagrams, and plots. - No installation required! Launch it *instantly* with [one click](https://www.circuitlab.com/editor/7pq5wm/?from=homepage). [Launch CircuitLab](https://www.circuitlab.com/editor/7pq5wm/?from=homepage) *or watch a quick demo video* → **Browser compatibility warning:** CircuitLab may not work as expected in your web browser. Please see our [System Requirements](https://www.circuitlab.com/docs/system-requirements/). [](https://ultimateelectronicsbook.com/) ### Interactive Electronics Textbook New\! Master the analysis and design of electronic systems with CircuitLab's free, interactive, online electronics textbook. Open: [**Ultimate Electronics: Practical Circuit Design and Analysis**](https://ultimateelectronicsbook.com/) ### [Electronics Questions and Answers](https://www.circuitlab.com/questions/) *from the CircuitLab Community* 1 answer 0 comments [Medicion en una fuente conmutada](https://www.circuitlab.com/questions/ujuct459/medicion-en-una-fuente-conmutada/) 4 hours, 25 minutes ago 1 answer 0 comments [Hall Effect Signal](https://www.circuitlab.com/questions/y72v4rpq/hall-effect-signal/) 4 hours, 34 minutes ago 1 answer 6 comments [Clock Chime Circuit](https://www.circuitlab.com/questions/z7ptf5au/clock-chime-circuit/) 4 hours, 36 minutes ago 1 answer 0 comments [Question rosin soldering](https://www.circuitlab.com/questions/mqjd2x5z/question-rosin-soldering/) April 06, 2026 2 answers 0 comments [Site license for University?](https://www.circuitlab.com/questions/f73t3pmu/site-license-for-university/) July 17, 2020 [Browse More Questions](https://www.circuitlab.com/questions/) • [Ask Your Own](https://www.circuitlab.com/questions/ask/) • [Contribute an Answer](https://www.circuitlab.com/questions/) # Examples - [555 Timer as Oscillator](https://www.circuitlab.com/editor/e38756/) / [PWM Generator](https://www.circuitlab.com/editor/z242cn/) - [7805 & Wall-wart Experiencing Voltage Drop-out](https://www.circuitlab.com/editor/4j8yb7/) - [BJT audio amplifier](https://www.circuitlab.com/editor/6syafk/) - [BJT Cascoded Active-load Diff. Amp. with CMFB](https://www.circuitlab.com/editor/fby849/) - [BJT current mirror](https://www.circuitlab.com/editor/7f7ge4/) - [Digital 4-bit counter and DAC](https://www.circuitlab.com/editor/53xa3r/) - [Diode half-wave rectifier](https://www.circuitlab.com/editor/4da864/) - [Diode full-wave (bridge) rectifier](https://www.circuitlab.com/editor/f6ex5x/) - [Diode turn-off time](https://www.circuitlab.com/editor/fwr26m/) - [Laplace transform step response and Bode plot](https://www.circuitlab.com/editor/5gcrpn/) - [LED with resistor biasing](https://www.circuitlab.com/editor/z79rqm/) - [JFET-based electret microphone amplifier](https://www.circuitlab.com/editor/w88e3e/) - [Mechanical spring dashpot Laplace model](https://www.circuitlab.com/editor/d6749d/) - [MOSFET and resistor NAND](https://www.circuitlab.com/editor/42475b/) / [NOR gate](https://www.circuitlab.com/editor/zjc468/) - [MOSFET (CMOS) NAND](https://www.circuitlab.com/editor/592d96/) / [NOR gate](https://www.circuitlab.com/editor/kzw5km/) - [MOSFET switching inductive load](https://www.circuitlab.com/editor/t67g8z/) - [Op-Amp inverting](https://www.circuitlab.com/editor/bkg2qg/) / [non-inverting amplifier](https://www.circuitlab.com/editor/me84mf/) - [RC vs. RL step response](https://www.circuitlab.com/editor/r586j5txhufk/) / [frequency response](https://www.circuitlab.com/editor/vr2qz6p4k643/) - [RLC resonance](https://www.circuitlab.com/editor/wt3nym/) - [Resistors in series and parallel](https://www.circuitlab.com/editor/g2qzxs/) - [Zener diode voltage reference](https://www.circuitlab.com/editor/7f3ndq/) - [*more examples in "Ultimate Electronics" book...*](https://ultimateelectronicsbook.com/)  **Common sense schematics** let you name a node "+5V" and know that the simulator will do the right thing automatically, keeping your schematics compact and elegant.  **Quick-access build box** lets you draw basic circuit primitives quickly, while allowing access to a wide assortment of non-linear elements, feedback elements, digital / mixed-mode components, and custom drawing tools. ### Easy-to-use Power Tools **Easy-wire mode** lets you connect elements with fewer clicks and less frustration. **Cross-window copy/paste** lets you easily explore and re-mix parts of public circuits from the CircuitLab community.  **Mixed-mode circuit simulation** lets you simulate analog and digital components side-by-side. **SPICE-like component models** give you accurate results for nonlinear circuit effects.  **Human-friendly formats** let you enter and display values concisely, just like you would on a paper schematic. **Unit-aware expression evaluation** lets you plot arbitrary signals of interest, such as differential signals or power dissipation.  **In-browser simulation and plotting** lets you design and analyze faster, making sure your circuit works before ever picking up a soldering iron. **Unique circuit URLs** let you easily share your work or ask for help online.  **Advanced simulation capabilities** include frequency-domain (small signal) simulation, stepping circuit parameters through a range, arbitrary Laplace transfer function blocks, and more.  *** “Give it a try – this is a great idea.”  “Amazingly user friendly and simple for even the novice hobbyist to dive into.”  “Browser-based circuit simulator boasts a mountain of features.”  *** **“Smart Wires” Technology:** Build your schematic faster than ever before with our unique, intelligent Smart Wires technology for connecting terminals and rearranging components.   **Proprietary Simulation Engine:** An extended-precision numerical solver core plus an advanced mixed-mode event-driven simulation engine makes it easy to get simulations running quickly. **Presentation-Quality Schematics:** Print sharp, beautiful vector PDFs of your schematics, plus export to PNG, EPS, or SVG for including schematics in design documents or deliverables.   **Powerful Plotting Engine:** Work with multiple signals easily with configurable plotting windows, vertical and horizontal markers, and calculations on signals. Export plot images for inclusion in design documents. **Rapid Symbol Creation:** Draw generic rectangular symbols for IC or system-level wiring diagrams with just a few clicks.   **Behavioral Sources & Expressions:** Experiment and iterate rapidly with programmable algebraic sources and expressions. [See documentation](https://www.circuitlab.com/docs/expressions/) “ CircuitLab is the best editor I have ever used. Bug-free design, excellent simulation. Well done. No more using LTSpice. ” — @yigitdemirag “ In our product development cycle, we've used CircuitLab in more places than you might expect: optimizing our analog front-end, RF matching network analysis, improving our power supply robustness, and designing and documenting test and production fixtures. ” — Pantelligent Hardware Engineering Team [Launch CircuitLab](https://www.circuitlab.com/editor/7pq5wm/?from=homepage) [Home](https://www.circuitlab.com/) [My Workbench](https://www.circuitlab.com/workbench/) [Documentation](https://www.circuitlab.com/docs/) / [FAQ](https://www.circuitlab.com/docs/faq/ "Frequently Asked Questions") [Membership](https://www.circuitlab.com/accounts/upgrade/) [Electronics Textbook](https://ultimateelectronicsbook.com/) [Electronics Q\&A](https://www.circuitlab.com/questions/) [Forums](https://www.circuitlab.com/forums/) [Blog](https://www.circuitlab.com/blog/) [About Us](https://www.circuitlab.com/about/) [Contact Us](https://www.circuitlab.com/about/contact/) [Terms of Service](https://www.circuitlab.com/legal/#terms) [Privacy Policy](https://www.circuitlab.com/legal/#privacy)  CircuitLab provides online, in-browser tools for schematic capture and circuit simulation. These tools allow students, hobbyists, and professional engineers to design and analyze analog and digital systems before ever building a prototype. Online schematic capture lets hobbyists easily share and discuss their designs, while online circuit simulation allows for quick design iteration and accelerated learning about electronics. [Website monitoring](https://heyoncall.com/website-monitoring) and on-call alerting by [HeyOnCall](https://heyoncall.com/). Copyright © 2026 by [CircuitLab, Inc.](https://www.circuitlab.com/about/)

**Browser compatibility warning:** CircuitLab may not work as expected in your web browser. Please see our [System Requirements](https://www.circuitlab.com/docs/system-requirements/). “Give it a try – this is a great idea.”  “Amazingly user friendly and simple for even the novice hobbyist to dive into.”  “Browser-based circuit simulator boasts a mountain of features.”  **“Smart Wires” Technology:** Build your schematic faster than ever before with our unique, intelligent Smart Wires technology for connecting terminals and rearranging components.   **Proprietary Simulation Engine:** An extended-precision numerical solver core plus an advanced mixed-mode event-driven simulation engine makes it easy to get simulations running quickly. **Presentation-Quality Schematics:** Print sharp, beautiful vector PDFs of your schematics, plus export to PNG, EPS, or SVG for including schematics in design documents or deliverables.   **Powerful Plotting Engine:** Work with multiple signals easily with configurable plotting windows, vertical and horizontal markers, and calculations on signals. Export plot images for inclusion in design documents. **Rapid Symbol Creation:** Draw generic rectangular symbols for IC or system-level wiring diagrams with just a few clicks.   **Behavioral Sources & Expressions:** Experiment and iterate rapidly with programmable algebraic sources and expressions. [See documentation](https://www.circuitlab.com/docs/expressions/)