I love this tool because you can export links or export circuits as text files.
Clock circuit I made that uses faster and slower buttons to adjust the speed: https://tinyurl.com/2nvlulfl
8-bit binary multiplier (LSB on top): https://burlette.net/multiplier.txt
I found Paul's sim by chance and really liked it because it was the first electronics sim that I had seen that was properly interactive and visual in its approach. I thought it was a great tool for building intuition about circuits. However, at a certain point it became clear that Java in the browser was on its way out, and this really needed to become a plug-in free experience if it was going to continue to be useful.
This was about the time that V8 was coming along and revoluationizing the performance of JS. Originally there was no license attached to the project, so I asked Paul if he was OK in me trying to port it to run on JS using the GWT framework. He was fine, but said he'd done old experiments with some of his other sims and found that JS wasn't performant enough, but with the strides in JS performance I was more optimistic.
I took the Jave code and commented just about everything out to get a minimal implementation of the standard LRC circuit just to see the performance. Once I was comfortable with that working I started adding every feature and every component back. Most of the work was replacing the Java graphics primitives with the equivalents from GWT.
Once the initial version JS version was out I did quite a lot of work mostly on UI features, especially the 'scopes. They were rather weak in the original and still not as good as I would really like, but much improved.
I have thought about monetizing and extending with EDA features, socials, etc. but its never been enough of a priority to do it. I kind of like its simplicity as it is.
It has been used a lot in education and a couple of teachers have contributed to the code to support their uses in classrooms.
It's kind-of amazing that it still has a very distinctive niche that nobody else has really gone after in quite the same way. I think a lot of that is because Paul's original vision and work on the Java version was so good.
There is a bit more context and some tutorials here: http://lushprojects.com/circuitjs/
For person trying to learn circuit theory and logic design, would you recommend a resource that can be followed along?
Also, any recommendation for kids? I think this area can be explored by kids in the same way programming.
https://www.ebay.com/itm/D274D-SN74H74N-Flip-Flops-Dual-D-Ty...
edit: I didn't get the "JK". You got me there. Well played.