Old 02-22-2011, 11:13 AM #241
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Default Re: Halo Style 2 stage COILGUN

Sounds like its coming together ^^

I finished my semi-auto-mechanism..mounted the holder for the booster...mounted the battery-pack.


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Old 02-22-2011, 01:40 PM #242
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Default Re: Halo Style 2 stage COILGUN

I'm off coilguns a little.. I'll be subscribed to the thread and reading everything !
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Old 02-22-2011, 03:46 PM #243
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Default Re: Halo Style 2 stage COILGUN

Why? Thought you were half way done?

Distracted by some lasers again? ;-)
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Old 02-22-2011, 03:52 PM #244
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Default Re: Halo Style 2 stage COILGUN

Yeah I am. But I have some projects to work on first. I'll be reading and waiting for your CGS
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Old 02-22-2011, 03:56 PM #245
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Default Re: Halo Style 2 stage COILGUN

Naw I dont know man.....you letting us down us other coilgunners.
Whats more interesting than piercing cats and cans with metal-slugs ;-) ?
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Old 02-22-2011, 03:58 PM #246
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Default Re: Halo Style 2 stage COILGUN

well, If I could get a working cap charger for my CG I'd make it ASAP. Unfortunatly, I don't know where to start, what to buy etc. That let ME down, and I'm building low powered lasers to selling to maybe new hobbists etc, that will give me the money to continue the CG.
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Old 02-22-2011, 04:12 PM #247
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Default Re: Halo Style 2 stage COILGUN

Well...solder a ZVS...rewind a flayback transformer (number of layers and AWG can be found on the net) then just measure the output and adjust til it fits ^^

A ZVS including transformer cost maybe 10-20 $! You have to hang in and get things done...quitting is never an option...at least for me ;-) You have to go on and try stuff out. If Plan A fails, you have to come up with Plan B and C.
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Old 02-22-2011, 04:17 PM #248
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Default Re: Halo Style 2 stage COILGUN

Oh well.. I 'm not quitting. I'm thinking
Whats the ZVS max power? 100W?
Can I stack in parallel? :P
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Old 02-22-2011, 04:33 PM #249
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Default Re: Halo Style 2 stage COILGUN

100W xD who the hell told you that? Its zero voltage switching...almost no heat will be generated. If you make it right, the FETs wont even get warm. So it depends on your FETs and the transformer of course.

100W wouldnt be that bad actually...1000 J in 10 sec.
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Old 02-22-2011, 04:35 PM #250
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Default Re: Halo Style 2 stage COILGUN

No one told me nothing. I wanted a 400W (800v 0.5A) transformer but I realized it is impossible. 400W should charge my caps fully in 1 second, 200W 2 seconds, 100W 4 seconds

What ZVS do you suggest me? Being cold isn't really needed, as space isn't hard to get. I have some heatsinks ready to use SIR!
btw.. We've talked about fets I have some.. they are from an old UPS.
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Old 02-22-2011, 04:42 PM #251
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Default Re: Halo Style 2 stage COILGUN

http://www.elektrodilna.wz.cz/data/zvs_driver.png

The coils would heat up and performance would decrease if you would fire shot after shot....your SCRs wont like it neither.
So I would aim for 4 sec charge...still damn fast! And its your first coilgun...would still be far beyond cool ^^
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Old 02-22-2011, 04:43 PM #252
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Default Re: Halo Style 2 stage COILGUN

I was thinking about that when I read this:

"This thing will push a few 100W through the flyback if you let it."

I would need to rewind the flyback, right? Any tips/recommendations?
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Old 02-22-2011, 04:46 PM #253
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Default Re: Halo Style 2 stage COILGUN

Bullshit. Flybacks arent made for such wattages...even the "bigger" ones.

Have to workout...google for transformers...should be some drivers for coilguns on the net. Will help you as soon as I get back on!
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Old 02-22-2011, 04:51 PM #254
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Default Re: Halo Style 2 stage COILGUN

two flyback drivers driving two flybacks with the outputs parallel. Would work?
I have 55v mosfets and 14mOhms (rds on). :P
as the circuit needs 150mO or less, I think mine are pretty good for this. I'll be buying the parts when I go to the electronic store. Btw, 11v @ 140A discharge will work fine for the charger right?
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Old 02-23-2011, 08:46 AM #255
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Default Re: Halo Style 2 stage COILGUN

Ok, so instead of fabricating the C channel enclosure for the 2nd stage, I have put together a "bank" of capacitors in parallel on a board. This way I might be able to start testing the 2nd stage tonight. ^^ I will post some results if all goes well. ;-)

Edit: this is ~1150uF/2nd stage and 2250uF/1st stage.
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Old 02-23-2011, 08:51 AM #256
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Default Re: Halo Style 2 stage COILGUN

Leo: Start simple. The more stuff you wanna squeeze in, the more errors you might make...

Milli: So night is over...did you test it? Cant wait to see a video.
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