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Re: TC Limits



>Original Poster: "Mark Fergerson" <mfergerson1-at-home-dot-com>
>

snip...
>Most commercial speakers are pure crap IMHO. I guess we're lucky
>nobody makes TC's commercially, eh?


Actually they do! Look at  http://www.amazing1-dot-com/tesla2.htm for 'the
smallest Tesla Coil'.

>> For a pulse mode 50KV supply I think you could best search on the net for
>> "laser power supply" or "Sam's laser faq".
>
>  I bookmarked Sam's site some time ago. I was looking at a TC because
>I want to build as much of this thing as I can, and I don't need a
>whole lot of output current. A TC is such an elegant thing, so few
>components for so much results.

Yes, it is so elegant that 'the smallest TC' I mentioned delivers 75kV (they
say)! That's why I don't understand your 50kV limitation. Heck, on a sunny
dry day you could build that up in seconds, just by walking!

>
>  I keep getting told that "certain things won't work" without any
>justification. I hate that and wanted some ideas from experts who, if
>they haven't done what I'm talking about, can at least tell me _why_ I
>shouldn't bother. Most electronic systems scale nicely (with some
>adjustment, of course) and a TC should, too, no?
>

In theory maybe, but if you only consider the spark gap, it will be clear
that growing from a single to a multiple to a rotary gap brings a lot of
different problems to solve.

>  Details like how to determine the coupling between coils before
>winding them should be straightforward from geometry, but I don't know
>how, and was hoping somebody could give me a clue.
>
Coupling is depending on geometry, so experimenting is for the most of us
less demanding then finding the wright formula...

>  My question about length/diameter ratio was prompted by an offhand
>response from sci.physics.electromag; I've since gotten a more
>detailed private reply that cleared some of it up for me.
>
Ok, you made me curious. How private could this info be? Let's share our
wisdom!

>  As for my question about frequency limits, it relates to how often I
>want an output pulse, and I established 1 MHz as a starting point only
>to be told "no go" again without justification. That, and I'm curious
>about how small a TC can be built and still work "satisfactorily".
>
That's also a point of interest for me. I think there are contradictory
influences.
I think for an air coupled core, the higher the frequency the better the
energy transfer to the secondary coil, but the higher the frequency the
lower the capacitance of the primary cap must be (else, out of resonance).
But the lower the capacitance of the prim. cap the less Joules and the less
Joules the smaller the secondary arc!
Anabody out there who can help with this one?

>  Maybe I'm just too lazy, but I want to eliminate certain design
>options as "bad" without having to build them first. I also want to
>know why just for the sake of knowing stuff, I guess. That may be a
>conflict I'll have to resolve with a soldering iron; I should bestir
>myself and make a contribution somewhere. If nobody else has explored
>this area yet, I may discover something interesting...
>
I think you hit the nail here! That is partly the reason it stay's
interisting to make a TC. Someday you could get the credit for an important
improvement. It will only be known by 700+ man and woman and will not save
lives in the 'real world' or improve the 'quality of life', but it will
help.


 Ruud de Graaf
 Greetings from very dark Holland


>
>  Cheerful wave from the US!
>  Mark L. Fergerson
>
>