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Post by Deleted on Apr 28, 2008 3:50:15 GMT -8
I´m soryyyyyyyy, it is true, I did not read it, 0.11uF, the next coil must to be ferrite core from a flyback.Thank you very much, and i will to change the wrong data
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Post by Deleted on Apr 28, 2008 5:27:41 GMT -8
Lamazoid, I have this ferrite from a flyback, I can do a rod in two halves with this ferrite. Do you believe that it work if I stick the ends? I believe that the core(nucleus) must not be very important, the original core of my stun gun was of iron (laminates or plates)
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Post by Gary Lecomte on Apr 28, 2008 5:30:20 GMT -8
I´m soryyyyyyyy, it is true, I did not read it, 0.11uF, the next coil must to be ferrite core from a flyback.Thank you very much, and i will to change the wrong data You might also try to get a Larger Capacitance. It will produce less pulses per second, but each pulse will be higher current.
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Post by Gary Lecomte on Apr 28, 2008 5:36:21 GMT -8
Lamazoid, I have this ferrite from a flyback, I can do a rod in two halves with this ferrite. Do you believe that it work if I stick the ends? Hi Ivan, it might work ok. I have done that before. The only problem I see is that one is Round and the other is Square. And if that parcel Doesn't show up soon, I'll send you a couple more Ferrite rod in a padded envelope.
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Post by Deleted on Apr 28, 2008 5:38:00 GMT -8
Hello Gary, you right, but with larger capacitance it´s very slow and the T1 traverses risk of short circuit
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Post by Deleted on Apr 28, 2008 5:41:07 GMT -8
I tried with 0.22uF; 0.33uF and 0.47uF. The best capacitance that work was 0.11uF (2 x 0.22 uF 630V)
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Post by lamazoid on Apr 28, 2008 10:03:37 GMT -8
What you mean "the best" ? Are you talking about spark distance? This is wrong. Summarizing the above, the less capacitance the more turns on primary you should have. This will DECREASE spark distance (you need to increase secondary turns accordingly to maintain long spark) but INCREASE the RMS current during pulse, and total efficency of transformer.
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Post by Deleted on Apr 29, 2008 1:40:17 GMT -8
Ok buddy, which you advise me? Must I increase the primary one? Nowadays my T2 has 30 (0,50mm); 3250 (0,10 mm) antenna core. I think to change 70 (0,45mm); 2000 (0,22mm) antenna core or 35 (0,45mm) flyback core. Thank you!
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Post by Deleted on Apr 29, 2008 3:49:43 GMT -8
What you mean "the best" ? Are you talking about spark distance? This is wrong. Summarizing the above, the less capacitance the more turns on primary you should have. This will DECREASE spark distance (you need to increase secondary turns accordingly to maintain long spark) but INCREASE the RMS current during pulse, and total efficency of transformer. 0,11 uF, better repetition of sparks. Mayor capacitance (0,22;0,33 or 0,47) is same to: repetition slowly. better current flow (sparks more brilliant) but the T1 works at the limit and the transistor heats.
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Post by lamazoid on Apr 29, 2008 11:37:46 GMT -8
I have disassembled one commercial stun gun, that was quite effective for immobilizing. Its T2 based on antenna rod has 140 turns primary and 6000 secondary of 0.1 wire. 1400 volts on arrester and 0.1 cap like in your case. But it's designed only for 14mm output spark. I believe with flyback rod you can make 70 turns primary as you wish (and it will be effective), but i advice to leave secondary as is (3250 turns) to have more spark length.
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Post by Deleted on Apr 29, 2008 18:09:26 GMT -8
Good information, thank you buddy!
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Post by Deleted on May 7, 2008 17:40:15 GMT -8
Lamazoid and Gary, hello friends!!I constructed the circuit (Steelratsclub) but it did not work. T1 works well, but it does not produce high voltage. I use an arrester of 220v (It will work fast) but I do not have discharges in the surge arrester. The capacitors do not come out into the surge arrester. T1 lights a very bright neon bulb, but in T2 output I have a few volts. What do you think about this?
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Post by lamazoid on May 8, 2008 0:16:58 GMT -8
Do the following: 1. Disconnect (remove from circuit) everything after rectifying bridge. Connect any household light bulb, preferably 20-25 watts to the output and test. 2. If this works, connect single capacitor istead of bulb; DO NOT attach any resistors in parallel with cap. Check if the cap is charged normally (short circuit with screwdriver or something) Then connect the surge arrester and T2, and check. 3. At last, connect second cap and diodes. The circuit should work now, but do not make big spark gap at the T2 output yet, test it with 10-15mm first. If the 1st stage of test fails, this means problem with inverter. This is 80% of all problems reported by people having assembled this circuit. But don't be disappointed. First, disconnect mosfets and check them (read here www.uoguelph.ca/~antoon/gadgets/mostest.htm) . Then disconnect and check each diode in bridge. If this all works this means simply DISCHARGED battery, so charge it and you're done )) This circuit REQUIRES a lot of current so it may not work at all with poor sources like 9v battery, but it DEFINATELY will work with good charged NiCd cells if any parts are not broken. Some people also report an issue with resistors shunting the caps. I also noticed that - poor carbon resistors causing entire circuit to fail COMPLETELY, e.g. no sparks observing and no voltage on caps. I don't know why this happens, i've used old russian resistors and they work for me... So propably it'll be better for you to exclude them from the circuit.
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Post by Deleted on May 8, 2008 16:30:54 GMT -8
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Post by Deleted on May 9, 2008 15:32:04 GMT -8
There are some differences between my circuit and yours: * I use a ferite diameter of 25 mmm * This is the second T1, I did 0.22mm in the secondary and 0.50mm in the primary (the first T1 which was built with 0.10 mm had arches sparks in the interior) * The power supply is a transformer 220V 12 +12 V 5A (I use 12V with rectifying bridge) * bulb test is 220V 40W * The surge arrest is 220V but must operate anyway (fast) * capacitors are 0.33uF 630V but not fail the isolation, not to explode (not loaded) Perhaps I should use 0.10mm again, because it produces 0.22mm low voltage.
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