This was great! It served as a nice foundation to work off of. Your 2.0 looks interesting, but a bit too much for my son and my own limited electronics knowledge. This was simple.



Mods:



* 3/4" electrical conduit pipe instead of a magic marker. It felt more hefty, for all of the work that goes into the innards.



* Copper compression nut for the end with a clear marble superglued on the end. The LED sits behind the marble, making the whole thing glow (green, in our case).



* Exterior 9volt battery. The amount of rechargeables for the buzzer and LED to work got pricey for my first shot (I'm going to keep an eye open for junked toys, etc., for future ones). I'm interested in the capacitors you used for 2.0, but didn't really understand how they worked (I did experiment with them, to no avail.). My 9v straps on the back end, extending the tube without it being too obvious (and hides behind the wrist while being gripped).



My 7 year old son helped me make it for my 11 year old son's birthday. It helped him understand circuits and how to use a hacksaw.