Re: [TCML] Largest Secondary Coil "Drivable" by Primary Circuit

[Brandon Hendershot <brandonhendershot@xxxxxxxxx>]

Hi John,

As I increase secondary size, I'll have to subsequently account for more
power in the primary circuit in order to achieve the same spark quality.
But if I choose to increase power in the primary circuit, without increasing
the size of the secondary, it should simply throw more sparks, yes? Seems
obvious enough. If that's the case, I may just keep it the size it is and
enjoy better sparks! ;) At least until I can get more power into the primary
to pay off a bigger secondary.

Thanks John,
Brandon

On Sat, Sep 25, 2010 at 5:02 PM, Futuret <futuret@xxxxxxx> wrote:

> Brandon,
>
> It's not really so much an issue of driving power.  You can drive a
> somewhat larger
> coil with the same amount of power but it won't give longer sparks.
>  Usually
> coils are build that are "large enough" for a given power input.  Not much
> is gained by going larger.  If you plan to add even more power (more than
> 15/60), then it can be wise to build a larger coil.  For a 15/60 NST, a
> coil
> around the size of Gary Lau's coil makes sense.  Gary uses a 15/60 NST.
> This way the toroid size
> is a good match to the overall coil size, etc.  The toroid size *does*
> matter,
> and has to be somewhat matched to the input power.  A huge secondary
> run with low input power would need to have a relatively small toroid.
> A bigger toroid might work with a breakout point, but generally speaking
> things work best if generally matched up by rules of thumb, etc.  A coil
> the size of Gary's can run on a 15/30 also, but might work better with a
> smaller toroid in that case.
>
> For a 15/30 NST, a 4" x 13" toroid works well, and for a 15/60 NST, a
> 5" x 16" toroid works well.  These sizes allow for multiple streamers.
> As larger toroids are used, at some point only a single streamer will
> be formed.  This streamer may be longer however.  I think Gary is using
> a 7" x 26" toroid... something like that.  I think his specs are at his
> website.
> I'm sure Gary will comment.  I think Gary's secondary is about 6" x 26"??
>
> I don't know what size secondary you have now Brandon.
>
> John
>
>
>
>
>
> -----Original Message-----
> From: Brandon Hendershot <brandonhendershot@xxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Sent: Sat, Sep 25, 2010 6:11 pm
> Subject: [TCML] Largest Secondary Coil "Drivable" by Primary Circuit
> Hi All,
>
>
> I was looking at my secondary today that I plan on using in my next coil,
> and it looks so small to me now!
> I'm thinking about going all out with it now! :D
> What's the largest sized secondary dia. I could possibly hope to use with
> my
> primary circuit?
> Specs:
>
> * 8 Amp Variac
>
> * Basic Terry Filter
>
> * 15kV 30mA NST (Can add a second identical transformer for more power. ;D)
>
> * Richard Quick Spark Gap w/ 200CFM 120 V A/C Quenching Fan
>
> * 36kV 8.75nf MMC Bank (942C20P15K Cornell Dubilier Caps) (Second MMC bank
>
> can be added to balance the additional NST)
>
> Oh! Do I need to modify my Terry Filter to accomidate the second NST??? I
> imagine not, but I'd hate to fry it!
> What's the largest anyone here's ran with a system similar to mine?
> Thanks All, I really appreciate your help!
>
> Brandon
>
>
>
>
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