Re: PC board primaries

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi All - 

An idea (not sure if it's been thought of - I haven't paid close attention). 

For a double-sided pc board, the top and bottom trace can be slightly
overlapped. This would make it possible to simply etch/cut simple circlular
traces (a gap must be cut between each circle to prevent a shorted turn). A
feed through between upper and lower circle traces can link each turn. 

Something like this: You have to use your imagination a little. 

1     3     5     7     9 
----  ----  ----  ----  ---- 
   |  |  |  |  |  |  |  | 
   ----  ----  ----  ---- 
   2     4     6     8 

Space saving as well considering this approach: 
1     2     3     4     5     6     7     8     9 
----  ----  ----  ----  ----  ----  ----  ----  ---- 

Anyway, I was just thinking about the ease of simple circles instead of a
continuously growing traces. 
-- 
Barton B. Anderson 
<http://www.classictesla-dot-com>http://www.classictesla-dot-com 

Tesla list wrote: 
>
> Original poster: "Pete Komen by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <pkomen-at-zianet-dot-com> 
>
> What I see as a problem is that the flat trace on a flat board makes for a 
> physically large primary and a lower inductance than other arrangements.  A 
> flat strip of copper on edge and coiled in the normal fashion for a flat 
> spiral primary would have greater inductance and smaller size (and a would 
> likely have corona on the small radius edges).  Several layers stacked could 
> fix low inductance and size problems. 
>
> On the other hand, for a small coil at low power it could make a nice 
> looking primary. 
>
> I would like to hear results if you try it. 
>
> Regards, 
>
> Pete Komen