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Post by Deleted on Apr 12, 2008 11:39:20 GMT -8
Three capacitors in series 10kv to obtain a insulation of 30kv? An example: To get 0.33uf 1Kv may unite two capacitors in series 0.66uf 630 v resulting 0.33 uf 1260 v . It´s ok?
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Post by Gary Lecomte on Apr 12, 2008 12:46:07 GMT -8
Putting 3 capacitors in series to Increase the voltage rating is NOT a good idea, Unless they have Bypass resistor across each one to even out the charging voltage.
Without a Bypass resistor, they will not necessarly charge at the same rate and this can cause one or more of them to fail.
And in this situation, the Bypass resistor somewhat defeats the overall purpose of doing this as it Bleads off a small amount of current.
Also these resistors would need to be Very High values and as well as rated at 10,000 volts.
I Stock Many HV Capacitors Rated at 15KV and 30KV, But definately not in that high of capacitance. (Typically between 100pf to 3000pf range. Capacitors rated at .33uF and 10KV would be REALLY BIG. Also probably Oil Filled.
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Post by Deleted on Apr 13, 2008 3:15:57 GMT -8
Thank you Gary, 0.66 uf was like example, your commentary was of great help. Anyhow I thought about very small values disc type caps.
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Post by Gary Lecomte on Apr 13, 2008 4:29:45 GMT -8
Thank you Gary, 0.66 uf was like example, your commentary was of great help. Anyhow I thought about very small values disc type caps. Yes I know you were only giving an example. But even low capacitance, 15KV Cap are fairly expensive. The 15 & 30kv ones I have are disc type. Two Examples of the "Ceramite" Caps I have: 500 pF @ 15kv are $2.50 each, but only $1.50 if 25 are orderd. 3000 pf at 30kv are $11.00 each.
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Post by Gary Lecomte on Apr 13, 2008 7:19:14 GMT -8
Here is the Circuit that I use to test these "T2" trigger coils.
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Post by Deleted on Apr 13, 2008 8:36:43 GMT -8
Hey Gary you illuminated yourself, good circuit, very practical and easy to make.
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Post by Gary Lecomte on Apr 14, 2008 13:53:54 GMT -8
Here is my "REVISED" Test Circuit for these HV Transformers. It Operates directly from 110 @ 60 Hz, but can be made for 220 @ 50 Hz. Obviously its Not at 50 KV or more output. But typically between 10Kv to 20Kv Output. This is so I can test the coils Before Potting them to make sure there are no bad errors. And I can run them Continuous. And here is the PCB Artwork:
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Post by Deleted on Apr 15, 2008 15:46:00 GMT -8
Thank you This is the first coil that I make with my lathe, now I just need to make the turns counter (turn meter) like CHEMELEC COUNTER-UD
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Post by Gary Lecomte on Apr 15, 2008 18:41:56 GMT -8
Your Coil Bobbin looks really Long.
The One I show above on my tester is 5.8 Cm long and 1.8 Cm OD. The hole through it is .85 Cm.
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Post by lamazoid on Apr 16, 2008 2:28:03 GMT -8
Here is bobin i'm currently using for all stun guns. It's designed for 6mm ferrite rod, 0.1mm wire and provides 40-50mm spark length from 1400v arrester and 0.33 cap (my default setup) and drawing of it in PDF: slil.ru/25694855I will post a photo later.
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Post by Deleted on Apr 16, 2008 2:29:35 GMT -8
Yes sir. The coil is long because the wings are thick. I will to make again
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Post by Deleted on Apr 16, 2008 2:40:45 GMT -8
Wow ..! I am really impressed with your comments,nice bobin.Thanks!!!
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Post by lamazoid on Apr 16, 2008 4:08:18 GMT -8
Photo Note that i'm not using lengthwise cut anymore. Instead of it, i'm placing a piece of insulation under each next section, covering the wire that runs from previous section. Combined with vacuum potting this is very effective.
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Post by Gary Lecomte on Apr 16, 2008 6:30:24 GMT -8
Nice Bobbin.
Yes that taping works, but if the tape slips off the wire as your winding it, a weak spot can occur and a short can result.
I find it better to cut slots between every two sections, that are Radially Offset from each other around the diameter. (Not in a straight line across the bobbin.) This reduces the risk of an arc across that horizontal groove.
A small Dremal bit can easily make these slots.
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Post by Deleted on Apr 16, 2008 10:55:39 GMT -8
I think to make one equal, with wings of 0.50 mm. If I construct a bobbin with more grooves (15 or 17) which will be the result? I have to find the best bobbin for my circuit. Lamazoid_ How you make vacuum? With the water system? I think in doing to
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