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Post by Deleted on Mar 28, 2008 7:37:05 GMT -8
After trying to empty my coil, I think that your coil is amazing, easy to isolate with wax. Great contribution for hobbyists. Thanks! I will build the GARY circuit with your coil or my circuit with your coil!
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Post by lamazoid on Mar 28, 2008 10:45:50 GMT -8
Hello ivan.
Yes my circuit is self-oscillating. This is well known multivibrator but with MOSFETs instead of BJTs (bipolar transistors) and induction of T1 acts like load resistor in classical ciruit, and resistors like capacitors. This is very primitive description ;-) This circuits separately (with description) could also be found among Gary's projects (i don't remember where exactly but i've seen them)
HV coil is a transformer having one common output, but it's NOT auto transformer since windings are phased OPPOSITE. This is very important for proper circuit operation, so if you connect them wrong it will BURN the diodes and propably something else. But If you want just classical design without 2nd capacitor (like Gary's ciruit) this is not very critical.
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Post by Gary Lecomte on Mar 28, 2008 13:45:02 GMT -8
Using a Bobbin for winding T2 makes it simpler with less chance of internal arcing. But it still should be Potted.
Unfortunately, no one actually makes this type of bobbin as a standard part.
Previously, I laithed and Milled out bobbins for Special Flyback transformers I needed for a contract job I had. (Quite a complex design.) Than I had another guy make hundreds of them on automated machines.
I have also laithed out some of these for the T2 in the stungun, but I never posted pictures of them since few people have a Laithe to make these themselves. And I am definately not interested in making these for others. Its Too Time consuming.
Nylon material is OK, but not very stable in holding its shape. Delrin is Better. I find Glass Filled Delrin is Best. But very Abrasive on the Tool Bit.
Yes either Transistor or Mosfets work. Actually mosfets can drive more current because of there very low "On" Resistance. But mainly I chose to use that 2SD401A because I have Hundreds of them. Typically its a good HV Transistor. (used as a flyback driver in some TV's.)
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Post by Deleted on Mar 28, 2008 18:45:41 GMT -8
Ohhh! Very good explanation ! Thanks buddys !
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Post by Gary Lecomte on Mar 29, 2008 8:00:40 GMT -8
Here is a picture of a custom made bobbin for T2. NOTE: the Ferrite Rod does not protrude through at the HV End of the bobbin. This helps prevent Arcing to it. This Split Bobbin creates a Greater Internal path against possible arcing. These will only remain on my site for a Short Time. (Maybe a month, Than I will remove it.)
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Post by Deleted on Mar 30, 2008 16:15:15 GMT -8
Gary your coils are fantastic, very good job! The primary is between the secondary and ferrite? Or is at one end of the secondary? This coil has a common output as in the LAMAZOID circuit ? Or have two entrances and two exits? I can use this coil on your circuit (GARY's circuit) Thanks
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Post by Gary Lecomte on Mar 30, 2008 19:17:47 GMT -8
Gary your coils are fantastic, very good job! The primary is between the secondary and ferrite? Or is at one end of the secondary? This coil has a common output as in the LAMAZOID circuit ? Or have two entrances and two exits? I can use this coil on your circuit (GARY's circuit) Thanks On the bottom picture, the Primary is in the Middle. There is Two Secondarys connected in series. This creates Less chance of Internal arcing because each secondary is only half the output voltage and they are well seperated from each other. The Outputs will be at Either End of this Bobbin. Battery ground for the primary, as well as a secondary coil ground will be in the center at the primary winding. Yes it will work on my circuit, but it would be impossible to do without a bobbin like I show above. Without a Bobbin, you will get Arcing to the Ferrite rod, causing More arcing problems. The Bottom Bobbin is laithed from Glass Filled Delrin rod. The Upper Bobbin is laithed from Nylon Rod, which is not as good material. Do You have a Metal Laithe to make these?
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Post by Gary Lecomte on Mar 31, 2008 15:13:26 GMT -8
I found another source with More Reasonable Minimum Quantities and Prices for some pot cores and bobbins that I think are suitable for this project. So I've ordered a bunch of them.
When I get them, I'll be doing up some new designs for this.
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Post by Deleted on Apr 1, 2008 13:38:39 GMT -8
Gary the measuring of the coil is very critical? You could give some reference measurements or is not necessary?
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Post by Gary Lecomte on Apr 1, 2008 14:07:30 GMT -8
Here is the Winding of the Split Bobbin.
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Post by Gary Lecomte on Apr 1, 2008 14:20:55 GMT -8
Gary the measuring of the coil is very critical? You could give some reference measurements or is not necessary? I really don't understand your question completely. The Number of turns is Quite Important. The Drive Circuit and Tuning of it is Important. How the coils are Wound, Insulated and Potted is also Important. Wire Sizes are Somewhat important. Measurements? It must be wound Over the Ferrite rod. Ideally with the least amount of spacing so the magnetic lines of force get transfered from the core and wire to wire. But at the same time, reasonable insulation and distance is also important to prevent arcing. A Fairly Complex Question, but hope this helps.
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Post by Deleted on Apr 1, 2008 17:53:52 GMT -8
Thankyou
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Post by Deleted on Apr 4, 2008 14:04:38 GMT -8
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Post by lamazoid on Apr 4, 2008 23:00:04 GMT -8
Sure they will. Why the HV coil has primary outputs at one end ?
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Post by Gary Lecomte on Apr 5, 2008 6:19:30 GMT -8
Hi Ivan, Yes it Should work, But As I said in my Email to you, I doubt that the Varnish is good enough as an insulator. It does penitrate the windings and provide a reasonable protection in that way, but it does not provide enough protection over the outside. I recommend a 1/8 to 1/4 inch coating of epoxy over the outside to prevent surface arcing and corona discharge. Also the Hole through the Center of the secondary, appears to be Quite larger than required. Ideally the primary winding and ferrite core should fit Tightly Inside that hole. What Wire Gauge did you use for the Secondary? It looks Larger than is required. How Many turns on the Primary and Secondary? Here is a Factory potted T2. Note the Thickness of Potting.
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