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Registered Member #1974
Joined: Mon Feb 16 2009, 10:28AM
Location: United Kingdom
Posts: 9
Hello There was a thread regarding tubular toroids that seems to have vanished. I understand that Steve Ward answered this and gave a related link. Any chance of restoring this Phil
Registered Member #1974
Joined: Mon Feb 16 2009, 10:28AM
Location: United Kingdom
Posts: 9
Thanks for that. I have been told the original post summed up that the capacitance and the hold off voltage are both slightly reduced, but not by a significant amount.
Registered Member #1974
Joined: Mon Feb 16 2009, 10:28AM
Location: United Kingdom
Posts: 9
Mads, I never actually saw the original post myself but was informed of it. Anyway Finn's and your first link both look interesting, but your second link is to a very dodgy site. I certainly would not go there, as the chap who runs that has not had much luck at all lately with making large toroids, he's now on his third. (It's me) Phil
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Phil T wrote ...
Mads, I never actually saw the original post myself but was informed of it. Anyway Finn's and your first link both look interesting, but your second link is to a very dodgy site. I certainly would not go there, as the chap who runs that has not had much luck at all lately with making large toroids, he's now on his third. (It's me) Phil
What is going wrong for you?
I have the wooden form made, ducting, elastic string, alu tape, just need more time, wall filler and it should be done, but I would like to hear what went wrong for you.
Registered Member #1974
Joined: Mon Feb 16 2009, 10:28AM
Location: United Kingdom
Posts: 9
Hi, The 2nd example on my webpage is a 6 inch and that method worked well, as it is the toroid I use all the time on my 8 inch. But I want to increase the power of the coil now to 6.5kw, and so I need an 8x34 inch toroid. The 8 inch duct is quiet expensive, so to save money I bought some cheaper stuff (thinner) and used expanding foam inside to keep the shape. The result is a long and very messy story, but just to say it did not work! The next duct I bought on the web *looked* thicker but when it arrived I realised it was also not much better, and again it caused problems, as it was not rigid enough when joining the ends together. I am now on my third piece of duct, a much more rigid (and expensive) piece, and I am using the same method basically of wall filler and Alu strips as on the webpage. Instead of an elastic strip inside though I have made an internal collar from an old 8 inch acrylic pipe (a leftover piece from my secondary) and hot-glued this into the ends of the duct where they butt together to form a joiner. I am also trying to use the hot glue gun, to stick the metal ducting to the wooden former as well. This will be by running a bead of hot glue around the edges of the wooden former where the ducting rests against it. I will photograph and add a bit to the web page if it proves successful.
The tubular toroid would look very smart I think, but bending the pipe accurately enough is very difficult without the tools. I experimented with plastic water pipe with the idea of covering it with Alu tape, once it is in place but it crinkles too much on the inner side, so you would end up with hundreds of tiny break out points.
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Tubular Toroids Thread gone missing
