Coilgun, 2 stage, ~400J aka V2b

Time for my first 'real' 2 stage coilgun I guess. First stage will be switched manually with a microswitch+SCR whilst the second stage will have an optical trigger.

2x3300µF caps with max 350V, planning to charge them to ~315.

So far it's just a pile of shit since I'm still looking for a suitable barrel, unlike my older coilguns I'm downsizing the projectile this time. Planning to have 9-11mm diameter projectiles.

Here's a little clip of the pictured optical triggering circuit and one of the SCR assemblies being used on another coilgun, that one has a inner diameter of 14mm and a 12mm diameter projectile weighing in at around 40 grams.

 You can also check this clip out on my youtube:  Click me!