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Registered Member #32
Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
You're better off triggering by shorting wires together. My first ventures in CG land worked that way, until I got SCRs and made a massive improvement on efficiency.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Or, of course depending on the size of cap bank, you could just use an arm switch (or what they are called). I also tried the flash bulb trigger thing, but the cg worked alot better with just a switch to connect the coil to the caps. For the switch amperage, my switch was 5A for 400uF@330V. Of course a SCR is the best.
My own question, could a MOSFET, say IRFP460, be used to trigger coilguns? I know it wouldn't work on high energies, but lets say with a small cap bank (<10J)
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Spark, maybe you are thinking of knife switch? Like the big switches you might see in Dr. Frankenstein's lab?
Yes, the flashbulbs I used were the ones in my avatar, for the TC it was 12 in series and for the coilgun it was a single bulb and a trigger circuit like would normally be used in a camera, but the coil was in series with the lamp. The capacitor was only 150J, but results were still horrible.
(However, the actual avatar has nothing to do with either, its just a bulb hooked up to my ZVS driver with a rare earth magnet above it, out of the picture. The magnetic field makes the electrons want to flow side-to-side, but the voltage drives them forward, resulting in a spiral.)
Oh and yes I believe you could switch a small coilgun with a MOSFET. IIRC the IRFP260 is good to 200ApK.
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
I want to bring this into a classroom and the loud bang scares people. Was the coil before or after the bulb. I think if I use a smaller one from a disposable flash camera I might have better results.
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Flash lamp coil gun
what would the drop be voltage or curent.
