 my multistaged coilgun idea (pretty sure I don't know what I'm doing)
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brandon3055
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Registered Member #4548
Joined: Mon Apr 23 2012, 03:52AM
Location: tasmania
Posts: 271
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Just use a phototransistor and an ir led to trigger the scr I used it for my small coil gun and it worked fine you will just need another transistor to amplify the signal before sending it to the scr
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Forty
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Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
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probably better than two wires conducting through the projectile: A microswitch who's lever protrudes into the barrel. The switches used in floppy and cd drives to detect the end positions of the disk/tray work even better and are more sensitive.
Using the barrel to close the coil and capacitors through the projectile would cause a Lorentz force (on the projectile) toward the wall of the barrel which could cause some significant friction.
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Josh Campbell
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Registered Member #5258
Joined: Sun Jun 10 2012, 10:15PM
Location: Missouri - USA
Posts: 119
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Good idea, if your trying to avoid the optical route the switch would be better than the wires. I still think the extra physical work of cutting up the barrel and mounting the switches exceeds the effort involved with a simple optical emitter/detector. But sometimes it's all about whats sitting in your junk bins!
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