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Re: [TCML] New Coil - Any glaring errors I have made?


Running the coil with a variac, at approx 40-50% power level, use some 1/2"
thick wood blocks to raise the sec coil in increments.  I bet you find best
performance with the sec
coil raised approx 2-3 inches above the horizontal plane of the primary
coil.  This should be the point where the max sec spark length is produced
indicating a "happy primary
circuit tuning point" and smooth operation of your primary spark gap.  When
you find the best spark length at medium power, then take it up to full
power and your coil should
run smooth with no loud bangs.  The strike rail is not necessary for this

Most coils like to run a loose coupling K factor.

Dr. Resonance

On Thu, Oct 2, 2008 at 6:44 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> Hi Philip,
> It all looks fine to me. No glaring issues. The 4.7 inch diameter is fine
> for the 10/48 NST. You probably will want to raise the toroid to about a
> center line of about 51". Your secondary turns are dependent on heavy build
> insulation of the magnet wire, so be sure that is what you use. But cap
> size, coupling, ratios, and distances all look good to me. Also, once the
> coil is wound, update the program with actual turns of course.
> Take care,
> Bart
> P Tuck wrote:
>> Hello.
>> I would appreciate it if anyone cares to look at my proposed Javatc setup
>> below, before I start the actual build. I have aimed for a low Res freq
>> whilst trying to keep the inductance up to avoid gap losses. Static gap is
>> a
>> sucker (connects to my workshop Hoover) that I've built using 0.75 inch
>> diam' copper rods. It is grossly over engineered, but it allows for future
>> scope if needed.
>> http://homepage.ntlworld.com/follies/tesla/tesla_temp.html
>> I have pushed the secondary size to 4.7 inches to get the impedance and a
>> higher Q, or am I pushing it at 4.7 inches for a 10k/48 NST??
>> Main points are:-
>> Sec' Diam = 4.724 inch (120mm PMMA tube),  5:1 H/D ratio, 1343 turns of
>> AWG
>> 27, Res freq 161 Khz.
>> Terry Filter, Caps are 14 x 2 of the popular CD 0.15uF's giving 0.02143uF
>> total  (about 1.4 times the Res value) + 10Meg bleeders.
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