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Re: [TCML] bipolar coil
I have wound the coils and put about 25 coats of poly on them, and made the toploads. In fact, everything is done except for the primaries.
I do realize that 1350VA is a huge amount of power for such a small coil. I think I got a little carried away. Originally I was going to use just one of the 60mA transformers, but then I found another one real cheap, so I bought it. I had another 30mA sitting on the shelf and figured what the hell, lets make a monster of a small coil. I think I'll just stick with the original plan of 60mA.
Bart, I tried inputing just one of the twins and doubling the cap size. I get a geometry error, less than one turn primary. I also tried it with 120mA, 90mA, 60mA and 30mA, all with the same results. This was with 2x the recommended LTR cap size for a synchronous rotary gap for each of the currents. I tried it with double 2x resonant also, with the same results. I haven't tried tweaking the primary dimensions, except for spacing the coupling. Any suggestions?
bartb <bartb@xxxxxxxxxxxxxxxx> wrote: Good point! I agree. This 2.375" diameter secondary doesn't need 150mA.
That's a huge amount of power for such a small coil. Use at least a 4"
secondary or larger for 1350VA power.
The fact that the coil is this small will make primary tuning that much
more difficult (very little inductance per coil). Move the tap 3" can
cause a huge shift in resonant frequency. This is starting to sound like
a problematic coil, but good to realize ahead of time.
Kris, is it too late to advise against this coil size? Have you already
gone ahead and wound the coils or are you only in design mode?
Unfortunately, often the coiler has built parts before asking. Hope this
isn't one of those moments.
Bart
> Hi
>
> Just my most humble opinion, but that is an awful lot of power for such small
> coils. I would think a single 9x30 would be quite adequate, a single 9x60 at
> the most.
>
> later
> deano
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