[TCML] Refurbished Coill

["Ruben Peters" <ruben.peterstc@xxxxxxxxx>]

Hello All,

I've recently re-joined the list, and am getting back into coiling after a 3
year hiatus, anyway, I'm aiming to refurbish my first coil-to be sturdier
(initially a hot glue and tape job), and a better performer (originally
around 9" sparks with  9.2nf wine bottle caps, and what I think was over
coupling due to the occasional racing spark and the 40 degree, 7 turn
conical primary).

 

I plan to use my original secondary coil, and 12/30 NST, with a new MMC and
flat primary setup.

For the spark gap, either a Multi-segment static gap, or I'll try out some
gas surge arrestors (Im aiming for a bit of noise suppression)

 

 The Planned specs are:

 

Transformer/Cap:

 

12/30 NST

11.1 nf LTR Cap

 

Primary (wintesla 5 and Tesla Coil CAD 2) :

 

Primary capacitance : 0.0111uF

Primary resonant frequency : 428.89kHz

Primary conductor diameter : 0.25in,6.35mm

Primary turn to turn spacing : 0.25in, 6.35mm

Spacing between the secondary and the inside turn of the primary : 0.59in,
15.00mm

The primary will need to be tapped between turn 8 and turn 9 to form a
resonant circuit at 428.89kHz

 

Inside Diameter: 3.346in 85mm

Total Primary Diameter: 16.35in, 415.29cm

Length 32.66ft, 10m

(This gives 13 turns total with the aim of re-using the primary for the
inevitable next coil)

 

Secondary: 

Secondary Wire Diameter (IN) 0.0113, Wire Gauge 29.0000   

Secondary Coil Total Outside Diameter (IN) 2.1650  , 55mm

Length of Secondary Coil (IN) 10.5000  , 265mm

Secondary Turns/Inch 86.1508

TOTAL TURNS : 878  

 

Secondary Coil Calculations (wintesla 5):

 

Inductance (mH) 7.86  

Medhurst K  0.78  

Radius (IN) 1.08  

Circumference (IN) 6.80  

Wire Length (FT) 497.33  

Self-Capacitance (pF) 4.31  

Secondary Frequency (kHZ) 865.00  

Secondary Frequency W/Terminal C (kHZ) 428.89  

 

Toroid:

 

Top Load Capacitance (PF) 13.26pf approx

Sphere Radius/Toroid Tube Diameter (IN) 2.5000  ,63mm

Toroid Diameter Tube Center-to-Center (IN) 10.0000 ,254mm

 

Of course I have a few questions, so any help/suggestions on the above are
very much appreciated.

 

1)      Will the 15mm clearance between primary and secondary base be
sufficient (the winding starts around 2cm up the secondary)?

2)       Any advise on coupling for this system (the notion that my previous
setup was over coupled is just a hunch, backed by the occasional racing
spark)?

3)      Am in in the ballpark for an optimum torroid size?

4)       Finally, does anyone know a good MMC source in Australia?

 

 

Thanks again for any input

 

Ruben

 

 

 

 

 

 

 

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