We know learning electronics can be daunting, so we are working on a "Codecademy for Electronics" to teach basic electronics (resistors, capacitors, transistors...). We are planning on launching soon, but in the meantime, you can check us out here: **broken link removed**
Falstad examples
7 seg. decoder https://goo.gl/0LVjqO
RLC voltage current https://goo.gl/dCM8Py
See Notchfilter link above and it loads the Java Applet then right click on Applet> Circuits> BandPass Filter to see example above.