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Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
I doubt a normal laser pointer will "do the job", however I saw a green laser gun in electronic gadgets for the evil genius. Thats the same one that information unlimitied has in their ad in the back of popular mechanics, the evil genius book said its visible for 10 miles and will cause blindness. Now thats a laser pointer...
I'm thinking of building a xenon pulse gun some time now, sounds fun. I've been looking for a project that uses the 30ish xenon tubes I've got lyin around from my last camera store visit Maybe I'll try for 5 or so to start... using photoflash caps and some kind of pulse system that delievers 15+kv. I might get around to making this in a few weeks if I'm lucky (or a couple months if I'm lazy).
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
I have a 110mW green laser from laserglow.com (got mine on Ebay; I would never pay full price!), and believe you me it will blind you permanently and I would bet its visible for far more than 10mi in ideal conditions (it'll burn darker colored objects, light matches, pop balloons, etc.)
I would never even think of pointing it in anyone's direction.
Oh and for those xenon tubes you have, a good way to fire them without a complex 15kV pulse system is to use a grill ignitor. Basically the capacitor, flash tube, and ignitor are all wired in parallel, but the capacitor has an inductor in series with it so the HV pulse arcs thru the tube instead of charging the capacitor. The much slower pulse from the discharging capacitor can get through the inductor unaffected.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Thanks, this is worth a try. Also the secondary of the ignitor would act as a very effective bleeder resistor.
This is elegant! what about the extra electrode? do i just connect it to one end of the tube?
might try this approach with some xenon units i have, would make driving it that much simpler (only require cap+tube+xformer, soldered together in a stack)
Registered Member #1208
Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
I would put it on the end of the tube connected to the inductor. it may be worth while to use a clamping diode across the inductor, depending on the LCR circuit. or you could use an alligator clip somewhere on the xenon tube. i have heard that flash tubes don't share the load very well, and that they like to pop like little firecrackers, only with glass shards. be careful!
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Strobe "guns" ?
Maybe I'll try for 5 or so to start... using photoflash caps and some kind of pulse system that delievers 15+kv. I might get around to making this in a few weeks if I'm lucky (or a couple months if I'm lazy).
