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Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Here is what I used to trigger the flashlamp (a single, but 5" long one) in my laser: I took a flyback core with a primary winding of two turns and a secondary of 50 turns of heavy, insulated wire. The secondary goes in series with your flashtube and caps. If you pulse a small cap (say 300V 3uF) through the primary, the high voltage kick in the secondary ignites the flashtube. The positive side-effect is that you dont need an additional pulse-shaping inductor.
Registered Member #106
Joined: Thu Feb 09 2006, 09:39PM
Location: Portland, OR and Istanbul, Turkey
Posts: 47
So I think I have decided on the sequencial flash syatem. Since I have about 100 camera left sitting in a box, I will leave the circuit boards intact. So what I will then do is build a sequence flasher with about 100?!? transistors? Each transistor wired to the leads of the push button on the Camera board.
Sounds like a lot of work. Is there an easier way? should I use the original camera board?
I'm going to Google to see how much I can learn about the exact workings of the camera.
<Edit> After googleing about the flash circuit a bit more it seems pretty straight forward. I will build a box with perhaps 5 to 10 flash units, build a flasher circuit and hook them up in a crude fashion. This is jsut to see how everything will work.
Second, if it is interesting enough, and since I really do have time on my hands, is to build a a main controller flash unit, then make a few boards that will accomodate more than one flash unit. in other words make a camera flash board, but build to have more than one flash on it.
If I can build my own board to handle the flash units, then I can power the caps myself instead of having 100 batteries hooked up. I can just wire the the caps to straight 300v. No oscillator, no transformers. Then only thing I would have to worry about are the trigger transformers. Those I would have to desolder from the cameras and resolder onto my board. Like I said. I have time.
This way I could most probably build circular boards to fit into a clear plexiglas tube. I might have to draw this up in Autocad to see what I get. </edit>
<2nd Edit> After taking a look at the design, it will be much simpler to use a double sided board. Nothing round or fancy. Justa 10 by 8 double sided circuitboard should do it. That way I can just put a 10 x 10 array of lights. create a base with a control board and Transformer. That way I can plug it in and go.
does anyone have an idea on how to push 120v to 300v without a massive transformer? I'm thinking about a much larger boost converter, but I don't know if It can handle the amps. Are boost chargers scalable to a large size? I would really like to have this thing do at least 3 to 4 Hz. </2nd Edit>
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
Voltage Doubler? You've been talking sequential, so I don't think it's any different than running a standard strobe light at 3-4Hz since you're just firing one at a time. If you're talking about firing them all at once, a really big voltage doubler?
Steve Ward runs his huge DRSSTC off one, I figure this won't draw that much.
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Ideas for Flash tube funniness
