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Registered Member #2393
Joined: Sun Sept 27 2009, 07:36AM
Location: Central Victoria, Australia
Posts: 7
OK, first of all, hi to all, this being my first post.
I found this site a year ago, and built a CG from the knowledge gained of these pages. It is 4x 400V, 22uF caps in parallel, connected to a kodak camera charging board, triggered with a mechanical relay. I got about 3-4M distance with it.
What I am attempting is to find out the operation of the flash board, so as I can rebuild it sans xenon flash system, and gain knowledge to soon build my own. This is what I have so far:
(software from
So, I try to find flash circuits online, and all seem to have a 5th wire, a feedback coil, this transformer does not. I also could find no reference to a feedback coil transformer in my jaycar catalogue. As you can see from the above, the values are wrong. What would be the general ratio and inductance for a flash/cap transformer used this way?
Registered Member #2393
Joined: Sun Sept 27 2009, 07:36AM
Location: Central Victoria, Australia
Posts: 7
yes, trying to copy the board I have, without the xenon flash system. I cannot find the schematic for the one I have, what I drew is about it without the flash....the links you posted are not quite the same. Am unsure of the center connection on the transformer in most schematics I have found. The board I am using only has one transistor, and the transformer only 4 legs. I suppose I could try build a different design, but I thought this would be a simple one to figure out the operating principle, due to small component count (and that I know it works).
thx for the links, will see what I can learn from them.
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
For a serious coilgun charger your gonna have to beef up that circuit a lot. A good charger should have an output of at least several watts for a short charge time on a large capacitor bank.
Registered Member #2393
Joined: Sun Sept 27 2009, 07:36AM
Location: Central Victoria, Australia
Posts: 7
Backyard Skunkworks,
>>For a serious coilgun charger your gonna have to beef up that circuit a lot.<<
Yes, for a serious coilgun. This is still my first. The circuit from which I am working happily charged 4x 300V 220uF, and I have this afternoon put this basic circuit onto a board, using the original parts:
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reverse engineer kodak flash charger
