Re: Beginner Q's

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Michael,

H/D looks ok as does the 1" spacing between 
primary and secondary. K is at 0.135 when the 
primary is even with the bottom secondary turn 
which is a fine place to start. The frequency 
however will be lower than indicated in whatever 
program you used here, both indoor or outdoors. 
For indoors such as in a garage or whatever, 
you'll be looking nearer to 500 kHz. I placed 
your toroids 2" above the coil and the larger on 
top of the smaller. I showed 507 kHz. The primary 
then needed to be 9.6 turns, so be sure to do a 
primary scrap wire test before you actually build 
it to verify (the 8 turn primary would not have 
cut it). The static gap showed 8 electrodes. 
Using a pipe style gap with 1/2" electrodes, the 
total gap spacing for near Vp of the cap is about 
0.4" or 0.057" between electrodes. The coil is 
capable of 39" sparks but realistically, you will 
likely see something between 30" and 40". 
Eventually, you may want to throw on a larger toroid.

Take care,
Bart

Tesla list wrote:

> Original poster: Michael Brooks <screaminfleadesigns@xxxxxxxxx>
>
> Ok I think I need some education!
> If you will permit me I would like to post the 
> calcs for the coil I am trying to build.
> I understand some of what it means but I am an 
> electrician not an engineer. Any pointers or 
> information on this design would greatly help!!
>
> 'Flea
>
> POWER SUPPLY
>
> Allanson Luminous Tube Transformer 120v input
> 15kv output
> 30ma
> 450VA
>
> General Electric Volt-Pac Variable Transformer 120v input
> 120 ­ 140v output
> 7.5A
>
> SECONDARY COIL
>
> Outer Diameter 3.5 inches
> Coil Length 14 inches
> Aspect Ratio 1:4
> Turns 651.1628N
> Windings #24 Gauge Magnet Wire
> Wire Length 596.3566 feet
> Resonant Frequency 680.287 KHz
> RF Resistance 249.68 12 Ohms
> XL @ Resonance 35618.78 Ohms
> Max Unloaded Q @ Resonance 142.657
> Inductance 8.337334mH
> Distributed / Stray Capacitance 6.572969pF
> Approximate Loaded Q 50.94893
> Terminal Capacity 6.572969pF
> Resonant Frequency Drop to 480.963 KHz
>
>
> TRANSFORMER / CAPACITOR MATCHING
>
> Max Primary Capacitance .0038 microfarads
> Minimum Voltage Rating 37500 Volts
>
>
> SPARK GAP
>
> Type Static
> Number of Gaps 8
> Gap Spacing .010 - .020 inches
>
> TANK CAPACITOR
>
> Type Rolled
> Plate Thickness Aluminum Roof Flashing
> Dielectric ; .040 Inches (40 mils) Polypropylene
> Plate Length 60 Inches
> Plate Width 14 Inches
> Capacitance per Roll .019 microfarads
> Voltage per Roll 8000v
> Rolls Required (Series Connected) 5
> Final Capacitance .0038 microfarads
> Maximum Transformer Capacitance .0038 microfarads
> Final Volt age Value 40kV
>
>
> PRIMARY COIL
> < B style="mso-bidi-font-weight: normal">
> Inductance Needed for Resonance 14.4microhenries
> Type Flat Spiral
> Conductor .24? (1/4?) copper tube ­ .3725? (5/16?) OD
> Number of Turns 8N
> Spiral OD 14.75? (14-3/4")
> Spiral ID 5.375? (5-3/8?)
> Turns Spacing .3125? (5/16?)
> Approximate Tap Point Turn 7-8
>
>
> TOPLOAD (TOROID)
>
> TOROID 1
>
> Torus Size 1? X 6?
> Torus Capacitance 5.10 pF ­ This to match secondary terminal capacity
> Suggested Diameter 2? - 4?
> Suggested Power Level 200W ­ 400W
>
> TOROID 2
>
> Torus Size 2? X 8?
> Torus Capacitance 6.80 pF ­ This to match secondary terminal capacity
> Suggested Diameter 3? - 5?
> Suggested Power Level 400W ­ 800W
>
>
>
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