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Post by KevinK on Feb 27, 2018 1:25:46 GMT -8
Yeah I have high res pictures. Ill msg you in a few. Ive read several pages via Google translation on a few Russian sites.
Thanks for your info. It’s greatly appreciated.
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Post by KevinK on Feb 27, 2018 2:47:02 GMT -8
As far as the CCFL transformer goes, I rewound the primary in one using Litz wire. 5winds each side. I hooked it up to my mosfet circuit and got decent high voltage arcs. Is it the normal primary winding that makes it a bad choice?
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Post by KevinK on Feb 27, 2018 2:52:41 GMT -8
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Post by lamazoid on Feb 27, 2018 7:24:06 GMT -8
As far as the CCFL transformer goes, I rewound the primary in one using Litz wire. 5winds each side. I hooked it up to my mosfet circuit and got decent high voltage arcs. Is it the normal primary winding that makes it a bad choice? not only the winding, but a low cross-section area of the core, which demands high switching frequency. on low frequencies it can saturate and ruin output power and overall efficiency. meanwhile, forcing the royer oscillator to operate at such high frequency leads to switching losses, through currents, and so, again - low power and low efficiency. you can try to use that transformer with external PWM driver ICs like TL494, SG3525 and others. but this makes entire circuit much more complicated and harder to debug without special equipment (e.g. oscillosope).
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Post by lamazoid on Feb 27, 2018 7:32:20 GMT -8
wow, drug users also make stun guns ))))) lol. the one shown is impractical and has many flaws. this will have almost no effect on human target, regardless of power level. the main component for classical circuits like this is T2, which entirely defines target response. making a sectional T2 with low turns primary will lead to hi-voltage but very LOW DURATION pulse. in the range of few us. output capacitors has totally NO EFFECT, except visual arc brightnes and loudness. that is _NOT_ related to efficiency at all. to make proper T2 you need layer-by-layer winding and a known good construction tutorial. because not only the turns ratio is important, but many, many other things..... btw, years ago i came here (to this forum) asking Gary about T2 construction info later in my experiments i've reached some good results: ecdinside.info/test/наш-ответ-оберону/of course, that is only one of many possible variations, but done right - it DEFINITELY will be effective.
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Post by KevinK on Feb 27, 2018 10:45:28 GMT -8
Yeah I ran into the limitation.7.4v 500ma lipo? Works fine. 7.4v 800mA? No go. Too much current for the CCFL. Im going to get this bobbin. www.aliexpress.com/item/32849583201/32849583201.htmlI have some decent Litz wire I am going to use for the primary, and for the secondary what would you suggest in guage size. I’ve read so much about how to make these properly, so I should be ok.
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Post by KevinK on Feb 27, 2018 10:47:31 GMT -8
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Post by KevinK on Feb 27, 2018 11:31:55 GMT -8
From reading this all again, I may be the first poster from the U.S. (please don’t throw anything at me)
I started messing with electronics in the mid 90s modifying guitar effects pedals. I recently got into it again. My knowledge of it is not even close to most on here. It’s all black magic to me at the moment.
I already have RC3000 diodes, .22uf EPCOS 1kv caps, and a few 1200v EPCOS discharge tubes. I’ve made several MOSFET oscillator circuits on a breadboard. My next step is to build a proper T1. I have a few T2s from other stun guns I’ve owned, and plan on building my own once I get the ability to vacuum pack one.
I wish people in rhe states was as interested in such things as those in say Russia. But alas, that is not the case.
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Post by Gary Lecomte on Feb 27, 2018 15:45:29 GMT -8
Yeah I ran into the limitation.7.4v 500ma lipo? Works fine. 7.4v 800mA? No go. Too much current for the CCFL. Im going to get this bobbin. www.aliexpress.com/item/32849583201/32849583201.htmlI have some decent Litz wire I am going to use for the primary, and for the secondary what would you suggest in guage size. I’ve read so much about how to make these properly, so I should be ok. That Bobbin is Not very Practical for a Good High Voltage. A Ferrite Rod would be Better.
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Post by lamazoid on Feb 27, 2018 22:45:15 GMT -8
yeah, i know this guy. one time he was hanging around SRC, then opened this "educational project" (lol). stun guns are totally banned in UK (except for police) so this is well demanded, i think, despite the prices btw, same reason caused hand-made guns popularity in Russia. stun guns are not banned here, but are very limited in power, and were (considered) ineffective by the people. at the time of early 2000s (peak of homebrew stun guns) that was the truth, now it's not, but most people continue to make them just for fun
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Post by lamazoid on Feb 27, 2018 22:56:31 GMT -8
From reading this all again, I may be the first poster from the U.S. (please don’t throw anything at me) I started messing with electronics in the mid 90s modifying guitar effects pedals. I recently got into it again. My knowledge of it is not even close to most on here. It’s all black magic to me at the moment. I already have RC3000 diodes, .22uf EPCOS 1kv caps, and a few 1200v EPCOS discharge tubes. I’ve made several MOSFET oscillator circuits on a breadboard. My next step is to build a proper T1. I have a few T2s from other stun guns I’ve owned, and plan on building my own once I get the ability to vacuum pack one. I wish people in rhe states was as interested in such things as those in say Russia. But alas, that is not the case. maybe, in US this is not so popular because you can just go and buy a taser, or even a handgun? i dream of free selling handguns in Russia, but this will never happen...(( (but strict laws here are compensated by corruption, so with a strong will and certain amount of money you can get one, hahh)) i agree with Gary, this RM6 core is not a good point to start, especially without experience in winding HV transformers. i suggest you to pick something like that: www.aliexpress.com/item/GU-Type-GU22-P22-soft-ferrite-core-magnetic-core-for-transformer-PC40-high-frequency/32706000651.htmland just curious, why do you need aliexpress if you have mouser? )))
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Post by KevinK on Feb 27, 2018 23:41:25 GMT -8
I hate dealing with Mouser’s website. The prices are higher too. I don’t own any guns. I have really never felt the need to. When I was young (1980s) (I’m 45) I always thought the stun gun was neat. I have boght a few cheap ones but was never really impressex. I like making things like this as well. I’ve gotten deeper into it than I expected to get, andI have learned a lot. I often go on Google’s image search and look up populated pcbs like some look at porn..
After my mom passed away this past year I got myself back into it to pass the time and take my mind off things.
Yeah I noticed the Xgen stuff reminded me of the Russian design, and was wondering if there was a connection there sonrwhere. I love how they act like they inveted the modern stun gun.. as if that circuit was of their own design.
The gas discharge spark gap method is interesting, but the anal rententive side of me likes the SCR idea.
I found a 1200v one on AliExpress a few months back.
I often use eBay instead, but there are things I can’t find on there either.
I guess it would be easier to just go on Xgen’s site and buy a T1 and T2, but it wouldn’t be nearly as rewarding.
I really do appreciate all the help and tips. Don’t want to become a nuisance.
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Post by KevinK on Feb 27, 2018 23:44:59 GMT -8
I take it that there is a plastic part that goes into this core?
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Post by KevinK on Feb 27, 2018 23:49:01 GMT -8
Have either of you experimented with “trench” mosfets? From what I have read they should work great in circuits such as these.
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Post by lamazoid on Feb 28, 2018 0:06:45 GMT -8
Have either of you experimented with “trench” mosfets? From what I have read they should work great in circuits such as these. they all are "trench" and... many other names, most of which are just advertising, not related to mosfet physics. just don't think about that too much almost any modern N-channel mosfet can be used. the critical things are Vds (drain to source breakdown voltage) which (thats my suggestion) should be >50 volts, because it should withstand not only input voltage, but also so called "reflected" voltage and various transient voltages. and RDs(on) - channel resistance, which can be any in range 30 mili ohms (the less the better). again, don't bother too much about POWER (most newbies in stun guns pray on POWER) , that's relatively low value - 20 to 30 watts output from T1 is MORE than enough.
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