Java Circuit Simulator

Paul Falstad likes to write Java applets, and he’s created quite an impressive collection. One of the coolest is this one, the Analog Circuit Simulator (pictured). It can graphically simulate all sorts of passive and active networks. You can build your own circuits, or you can check out the pre-made designs (like the Sallen-Key LPF shown).

It’s a lot of fun to play with, and a great way to spend this lazy Sunday.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 30,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — Savannah tells the story of the supply chain crisis in the U.S.

Wearables — Feathers from leather

Electronics — Get Oriented!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Events, Projects, and much more! #Python #Adafruit #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — No-Code IoT with WipperSnapper, Beaming Internet across the Congo, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 10/20/21 feat. DIN Rail 10×10 to Terminal Block Adapter!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



4 Comments

  1. If you use Linux, take a look at “ktechlab”. Offers Analog & Digital/Logic circuit simulation, and it seems to be able to program PICs with flow diagrams which should be nice for the non-tech people.
    (Crashy though.)

  2. Or, just use Spice if you’re interested in correct results. Anyway, this is not really "simulator" – just collection of pretty pictures.

  3. Pretty sure this *is* a simulator. 400+ lines of code in the analyzeCircuit() function (plus more in functions called from it), plus another 100 or so in LU factorization for solving a system of equations. And it looks like at least the Ohm’s law example recalculates currents correctly when you change resistor values. Maybe I missed something, though.

  4. Pretty impressive for how easy it is to use.
    Sure spice may be more adaptable but I have to admit it was pretty fun to play with (which is more than I can say about spice…)

Sorry, the comment form is closed at this time.