More powerful oxyhydrogen cannon
I have started to build a more powerful oxyhydrogen cannon for my second mosquito rover prototype, something similar like Estes Hydrogen Fuel Rocket:
The igniter of the Estes Hydrogen Fuel Rocket is simply a nichrome wire, but I want to continue to ignite the oxyhydrogen via spark. The spark generator I have used for the mosquito rover was a HV PCB from a bug zapper and it works not very reliable, so I designed a new one with a certain flash over at a spark gap of 1 mm:
The circuit is very similar to the voltage multiplier of my Geiger counter design, but without voltage regulation and with one Villard cascade more, able to produce about 2 kV (see attachment).
How to get perfect graphite electrodes by dismantling an AA alkali battery (No NiCd or Li-Ion battery!):
Keep the manganese dioxide and zinc casing, you can make interesting chemical experiments with it.