|
Post by Gary Lecomte on Dec 1, 2010 6:49:12 GMT -8
in the elictricfence bord is by cm meter or inch Inches.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 9, 2010 10:29:55 GMT -8
Taking into account the Lamazoid Schematic I Was thinking about increse his Taser Stun gun... The assumption is as follow: The power after the flyback transformer is about 22,5W and the volts of the surge arrester is 2500V to charge two 33nF capacitors. This gives us 9,2ms to charge the capacitors to 82,5uC of charge. If we charge a only capacitor the time is by the half. so the flyback Transformer charge a capacitor in 4,6ms If we take the other 4,6ms to charge another capacitor directly from the batteries... assumming about 2 ohm of internal resistor for the battery. We can charge a 2000uF capacitor to 24,6mC plus the 41,25uC gives about 300 times the charge of the first schematic... increasing its power output according to that. Surely there are some mistake in the modification but I can't find it. Of course the low voltage capacitor must be charged before and probably will be need to add some control circuit to that.... What do you think about that? I'll put the schematic modification Original form (http://steelrats.net/articles.php?article_id=180&rowstart=1) Attachments:
|
|
|
Post by lamazoid on Dec 9, 2010 10:36:23 GMT -8
Thats funny thats what i'm thinking even if that will work, it will bring down circuit efficiency near to zero. guess where it will be put in case you try to hit real attacker?
|
|
|
Post by Gary Lecomte on Dec 11, 2010 5:46:49 GMT -8
You do get some Extra Power from that charged capacitor, BUT you need to consider the Quite High Resistance of your Output Coil. I think it will severly limit the current discharge of that cap.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 12, 2010 6:24:26 GMT -8
The output coil is 200mm in lenght of 0,15mm diameter wire in a 10mm rod --- > this gives about 1300 turns of 3,14 cm of wire per turn. Equal to 42m of wire. It has 900 ohms/Km so the secondary coil has a resistance of 38-40 Ohms thats is very little when you compare it with 1000-1500 Ohms of the human body. Anyway, in theory, the high voltage is created by the coil. The capacitor only act as a high current source and, as lamazoid said, it is discharged throught the ionizacion channel created by the transformer... Lamazoid: What do you utilize as thin isolation betwen layers in your inverter transformer? insulating tape? sheet paper? I can't find the Nomex paper that Gary Recommend. And Why do you think the efficiency will be zero??
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 16, 2010 10:49:13 GMT -8
Hi again. This was only a idea to see what do you thiink about. Anyway I don`t know what I must put as isolation in the inverter transformer betwen layers. I had thinked to utilize Teflon From plumbing stores. It has 0,1 mm Or less in thickness and Teflon has a high dielectric constant.
Would be it right?
|
|
|
Post by Gary Lecomte on Dec 17, 2010 6:42:34 GMT -8
Hi again. This was only a idea to see what do you thiink about. Anyway I don`t know what I must put as isolation in the inverter transformer betwen layers. I had thinked to utilize Teflon From plumbing stores. It has 0,1 mm Or less in thickness and Teflon has a high dielectric constant. Would be it right? It Could be used, But any Sealant you use (Epoxy, Wax, Varnish, etc) Won't adhere to it and may also Block sealant from penitrating into the windings. That Could be a problem. You Could just use somewhat Thinner Paper. Your Sealant will Soak into it. Or depending on where you live, I could mail you some "Nomex".
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 22, 2010 6:08:15 GMT -8
Hi again and merry christmas I have some spare time and I have been thinking about the circuit again... With the previous modification... perhaps 18v is insufficient to be discharged so... As with the configuration of the 555 the duty cycle is about 50% The circuit only drain current from the batteries half the time and, therefore, half the power... It is calculated to be operated from a relativity good battery that has a limited max output current, say 1,5A but if with that configuration only charge the high voltage capacitor. It will be charged half the time because we only utilize one capacitor And we can utilize another flyback transformer to charge the other capacitor that will have the same voltage if we mantein the capacity. If we double the capacitor, 66n, then the voltage will be the half (2500-1250). In this way We can see, Changing the capacitance, what will be the optimum voltage for the working capacitor due to the charge of the capacitors is independent. To do that a MOSFET DRIVER can be utilized, Apart of heat less the transistors due to his high velocity conmutation, It has two output inverted so when One is on the other is off. In this way we can profit 100% duty cycle. I've been searching information about homemade HV isolation And people that make Tesla Coils have a huge information due to they need to make a very high Voltage capacitor. I've finded that instead of nomex (Thanks Gary) We can utilize transparent paper utilized in laser printers... It has a very high dielectric constant and is thin (0,1mm). On the other hand High temperature silicone perhaps can be utilized to seal the whole circuit instead Epoxy due to it's cheaper. Silicone can be disolved with industrials disolvents or Gasoline and then can be slurried and penetrate every hole. Wait until the disolvent evaporate and you will have a block of silicone that isolate the whole circuit from humidity and you from be zapped. (I haven't tried it still...) Well, that increase, slightly, the circuit size but I think that can be minimal... As always, I'll wait for your opinions And I'll put a rough schematic. ;D Attachments:
|
|
|
Post by Gary Lecomte on Dec 22, 2010 6:20:13 GMT -8
Instead of using a 555 and a Mosfet Driver, Why not use a TL594. It gives the output you want and will only require ONE Transformer.
Nomex Paper is More than just good insulation. It also has a STIFFNESS, to help maintain Even Flat Layers.
Re that Silicone: You will Still need a good Vacuum to get full penitration. And it will take a LONG Time to totally Dry.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 22, 2010 10:47:52 GMT -8
Yes, about silicone... yes, Dry it may be time comsuming. Another problem can be that if not well dried a spark could ignite the volatile disolvent.... Could be a problem but only experience can say its utility.
The transparency paper for laser printers is relativity stiff... I think it can be used...
And about the TL594... Yes it is a curious IC and can be helpful in many applications... I'll take note. But about our purpose I think it has only 250ma capacity in each transistor and to manage High capacitancy parts, as Mosfets are, could be a problem because, As Lamazoid in his circuit, Mosfet don't carry heatsink. And a delay in on-off carry heat due to work in active zone.... With de Mosfet driver You haven't that problem.
About use only one transformer.... If you use it as in the TL594 it work as a alternate transformer. With that type of transformer get such high voltage can be a problem. With the flyback is more compact and easy.
|
|
|
Post by Gary Lecomte on Dec 22, 2010 16:00:51 GMT -8
The TL594 is one of Many Such IC's.
It can drive Two MosFets to produce VERY Powerful Output into the First transformer and is Quite Suitable for a StunGun design. (Or Any type of Switching Supply.) And No Problem to get the 1500 volts or so to drive the Output Trigger Coil.
If you look at my Projects Page, You will see some Switching Power designs that use it.
I have also made a Stun Gun with this IC, But it is NOT on my Projects Page, as my site only Gives some BASIC'S of stun guns.
I do not want to show really powerful weapons on my site.
As to Heat Sinks, Stun Guns are suitable for MOMENTARY Short Time Outputs ONLY. So Assuming you follow that than No Heatsinks are Need, reguardless of the drive circuit.
|
|
|
Post by lamazoid on Jan 10, 2011 15:04:08 GMT -8
aburastas, sorry i don't have much time now to explain everything, but believe my experience, everything you talking about is nuts. sorry again for the word, i'm pretty tired explaining bunch of crappy ideas like that on russian forums dedicated to my SG design.. Just believe that EVERYTHING you can think about already WAS tried and studied, BEFORE final article was written. So, as i like to say, just follow the plan, and thats it. PS here is a short movie of recently conducted tests of my stun gun. that one was built exactly according the "taser" article. Output power is about 5 watts measured on 1000 ohm load. www.youtube.com/watch?v=KvHnS6IxrdUThe test goal was to take the baton, make 2 steps forward and strike the chair. As you can see, it's impossible to make even a single step. Muscles are blocked instantly + you feel REAL pain (but it's not the pain that actually stops you). Faces on the video are pixelazed , because human tests are totally illegal in russia. www.youtube.com/watch?v=KvHnS6IxrdU
|
|
|
Post by lamazoid on Jan 10, 2011 15:10:09 GMT -8
And here you can see the modern circuitry, which was used in the tests: www.steelrats.net/images/photoalbum/sixyevina.jpgThis is COMPLETE stun gun module, including battery pack (black box). Original stun gun (biult in 2005) near for size matching. This module is a part of 2-shot taser (not shown).
|
|
|
Post by lamazoid on Jan 14, 2011 14:13:54 GMT -8
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 15, 2011 9:33:17 GMT -8
Ok lamazoid, I got it. Anyway, many thanks for the videos. This is what I want to see.
|
|