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Please help me with my electrothermal cannon.

A place to ask general spud cannon related questions.
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Unread postAuthor: rp181 » Mon Dec 14, 2009 4:59 pm

Ile just reinforce what everyone else is saying :)
SCR's, as said, are only needed when repeatability, durability, and control are needed. Don't think solid state is superior, solid state has its disadvantages like ESR.
I am planning a triggered spark gap for my 12,000 joule cap bank, for both the railgun and a future ETG.
For 200 joules, look for a large relay or contactor, or a knife switch. You can also do spring loaded plates. If you want a handheld, I would do a mechanical solution, a copper block is attached to a lever attached to the trigger, which contacts a stationary copper piece inside. A spring will help release it, and provide tension to the gun doesn't trigger when you tilt it.
Consider a small magnet in the beginning of the barrel, so the projectile doesn't fall out.
knife switch:

Start with the boost converter, and we can help from there.
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