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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.

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or watch a quick demo video →




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


ELECTRONICS QUESTIONS AND ANSWERS

from the CircuitLab Community

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EXAMPLES

 * 555 Timer as Oscillator / PWM Generator
 * 7805 & Wall-wart Experiencing Voltage Drop-out
 * BJT audio amplifier
 * BJT Cascoded Active-load Diff. Amp. with CMFB
 * BJT current mirror
 * Digital 4-bit counter and DAC
 * Diode half-wave rectifier
 * Diode full-wave (bridge) rectifier
 * Diode turn-off time
 * Laplace transform step response and Bode plot
 * LED with resistor biasing
 * JFET-based electret microphone amplifier
 * Mechanical spring dashpot Laplace model
 * MOSFET and resistor NAND / NOR gate
 * MOSFET (CMOS) NAND / NOR gate
 * MOSFET switching inductive load
 * Op-Amp inverting / non-inverting amplifier
 * RC vs. RL step response / frequency response
 * RLC resonance
 * Resistors in series and parallel
 * Zener diode voltage reference
 * more examples in "Ultimate Electronics" book...

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.


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“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.”



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“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

“ 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

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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.

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