Tell us about yourself!
Is the 10k resistor that is in series with a 1N4148 diode placed by the wrong diode in the schematic? I built the driver circuit and it seems that I have a 50-100% duty cycle the way your schematic lays things out. I could also be wrong.
The lighter was used to fuse the string ends. The knots were honestly a pain to keep tied with the kind of synthetic fiber I was using; I believe I ended up triple-knotting them. I didn't seal the bottle caps at all - I just made sure they were tightly screwed on. It seemed to work fine - years later, the first thing to break has been the wooden boards (rot), but the plastic jugs haven't started leaking or anything.
Want to make thermite from battery manganese dioxide? It needs to be purified first, but I have a video describing that process: https://www.youtube.com/watch?v=BCmTzZa6ncY. Enjoy and stay safe!
Got any video of it working? I want to see it punch through that soup can. That would be cool.
Welcome to the great world of building things! While I don't have an Instructable on building my laser cutter, I have an extensive collection of website posts documenting my build. They are very detailed and should be helpful. Here is the link: http://sciencewithscreens.blogspot.com/search/label/laser%20cutterGood luck!
I made it, only I used nitric and sulfuric acid since I had both. I made some large fireballs, nitrocellulose string, and I even got it to explode with shrapnel! Check out the youtube video for exciting footage. https://www.youtube.com/watch?v=OmjHgaalygU