The fancy toroids have problems too, mostly cost, availability and then
they're heavy and completely overkill from a mechanical perspective. I
guess they do look cool compared to everything else.
Has anyone done a "bulk buy" of these recently? The shop that made mine
went defunct long ago.
I can wind pretty much any size coil that can be reasonably shipped or
picked up from the Chicago area. You might be in for a surprise though
when it comes to the price of materials alone. Magnet wire comes in 5
pound spools and up Even these are basically considered sample sizes. I'd
never buy respooled ebay specials. If the wire doesn't have a wrapper from
the manufacturer you don't know how knotted up it is, who made it or why
it was rejected in the first place. PVC drain pipe isn't too bad,
fiberlgass tubing is tens of dollars a foot now. hardware store
polyurethane varnish is cheap (and works fine), fancy engineered coatings
are not. Most of the good stuff is not compatible with PVC either. The sky
and your wallet are the limit. If anyone wants to to throw money at
problems, you can contact me directly. I'd save the money for a frequency
generator though.
My first secondaries were garbage and have to be redone multiple times.
Same for the person who got me started in coiling. The best was the coil
what was wound before realizing the magnet wire was just really old bare
wire with a patina that had no varnish insulation at all. Other rediculous
attempts were trying to use actual transformer varnish from a transformer
factory.
Your first coil works, so that's always a plus. It only gets better from
there as you refine your design and constuction techniques.
On Tue, 23 Nov 2021, Joshua Thomas wrote:
> Thank you!
>
> My topload is covered with copper foil. The base is dryer tube. While
> cheap, it is difficult to get a strongly smooth surface from it. I am
> jealous of those who can get the smooth spun-aluminum toroids.
>
> On the topic, can anyone recommend a service that will create secondary
> coils to specification? I am fairly bad at this and it?s one area I would
> be willing to spend a little money.
>
> Joshua Thomas
>
> On Tue, Nov 23, 2021 at 10:20 AM <pupman.com@xxxxxxxxxxxxxxxxxxx> wrote:
>
>> Hi Joshua,
>>
>> The arcs look and sound great in this video. They grow and move vs.
>> appear once and vanish. It does looks like there may be too many
>> breakout/sharp points on the toroid though, and lots of energy is being
>> lost. A light wrap of foil might smooth things out enough to allow
>> fewer, but longer and more developed streamers.
>>
>>
>> On 11/21/2021 4:03 PM, Joshua Thomas wrote:
>>
>> <content trimmed>
>>> These were used with 3 between each HV rail and RF ground. The caps
>> caught
>>> on fire after short use. You can see video of that event here:
>>> https://youtube.com/shorts/Sx_lHwjR_bs?feature=share
>>>
>>> (I should likely have shut this down sooner)
>> <content trimmed>
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> --
> Joshua Thomas
>
> My new email address is: joshuafthomas@xxxxxxxxx
> Please update your information if you have not already done so.
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