I just bought Circuit Playground, it is very cool, thank you!
As may soon be obvious, I am not an EE, and am just a hobbyist.
I had a few feature requests for the application...
1) Some basic descriptions/common uses of the various circuit calculators, especially in the Op-Amp section. Like what is the common use/purpose of them?
2) Some basic descriptions of the ICs listed in the Pin Out section, i.e., what a Shift Register is for?
3) A Plot of Voltage v Time on the Integrator/Differentiator
4) A new section for "Common Circuits," and have Low/Band/High pass filters, and other standard circuit designs http://mysite.du.edu/~etuttle/electron/elecindx.htm seems to have a wealth of circuits.
Thanks again for the great resource!