Re: This don't make sense.

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

Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi Garry,

        I am not sure what kind of top terminal you have but I get about 8
to 11
primary turns at around 250kHz.

Another way to look at it is 16^2 x 6.61 = 17 x n^2 where n = 10 turns (Nold^2
x Cold = Nnew^2 x Cnew).  This formual is not "exact" but "close enough".  As
you increase the capacitance, the number of primary turns will decrease.

So somewere around 9 to 11 turns...

Cheers,

        Terry


At 12:24 PM 12/10/2000 -0800, you wrote: 
>
> Recently, I got two 12/60 NST's (One fried immediately but they said they
> would replace it because they weren't sure about it) and the other I decided
> to try on this .017 uF doorknob cap I have and so I started up this tesla
> program on the internet written in java and it says I need 70+ windings on
> the primary and I don't believe it. I've never heard of a tesla coil that
> needed over 22 windings. This compared with the program saying I needed only
> ~16 windings for Terry's .0061 cap with the 12/30 NST.
>  
> The setup I had that worked pretty well was with a 12/30 nst and ~16 windings
> of 12 guage wire on a flat primary with four windings/inch center diameter
> 6".
>  
> The secondary is 3.5" * 17 3/4" wound with #28 guage wire from ESI. The
> program says the secondary resonant frequency is about ~255mhz. I not sure of
> the measurement unit mhz, it could be khz.
>  
> I tried tuning it with the 12/60 but all I got was a lousy 1" spark compared
> to using Terry Fritz EMMC at .0061uf I got two foot sparks with a 12/30.
>  
> I don't wanna try Terry's EMMC at 12/60 because I doubt it would take that
> kind of punishment and would probably be way outta tune anyway.
>  
> At anyrate, can someone run these figures through thier program and tell me
> what their program comes up with for windings on the primary?