Re: [TCML] H/D Question

["DC Cox" <resonance@xxxxxxxxxxxx>]

The 4.5 h/d ratio insures the coil has a lot of turns on it, typically 1,200
to 1,400 range.  This gives a higher inductance, and particularly in the
small coils, produces greater potential on the sec coil as the inductance
goes up as the square of the turns and also the square of the dia. of the
coilform.

If you get too many turns you begin to hit a wall due to higher resistance,
but with 30 and 60 mA coils 1,300 turns is a good number to shoot for.

Long 4.5 h/d ratio and also large sec dia.

Dr. Resonance




On Sat, Dec 6, 2008 at 12:44 PM, H.S. J. <hsheltonj@xxxxxxxxx> wrote:

> On a smaller lower powered coil (4", 15kv, 30ma) is it necessary to keep
> that 1:4/1:5 H/D ratio?  I designed one thats had a H/D of 1:2.75.  Would I
> be running into any issues?
>
> Plans are as follows:
>
> Secondary Coil DesignDiameter of secondary coil : 101.60mm (4")
> Winding height of secondary coil : 279.40mm (11")
> Wire diameter for secondary coil : 0.6452mm (22AWG)
> Spacing between windings : 0.00mm
> Secondary turns : 433.00
> Secondary wire length : 138.22m
> Secondary inductance : 5.86mH
> Approximate resonant frequency : 830.59kHz
> Secondary quarter wavelength resonant frequency : 542.61kHz
> Secondary self capacitance : 6.27pF
> Toroid capacitance required to form quarter wavelength coil : 8.42pFPrimary
> Coil DesignPrimary capacitance : 0.0053uF
> Primary resonant frequency : 542.61kHz
> Secondary coil diameter : 101.60mm (4")
> Primary conductor diameter : 3.26mm (8AWG)
> Primary turn to turn spacing : 12.70mm (.5")
> Spacing between the secondary and the inside turn of the primary : 50.80mm
> (2")
> The primary will need to be tapped between turn 6 and turn 7 to form a
> resonant circuit at 542.61kHz
> The approximate inductance at each turn is :
> Turn 1 0.49uH
> Turn 2 1.77uH
> Turn 3 3.75uH
> Turn 4 6.45uH
> Turn 5 9.88uH
> Turn 6 14.10uH
> Turn 7 19.17uH
> Turn 8 25.13uH
> Turn 9 32.06uH
> Turn 10 40.00uH
> Turn 11 49.02uH
> Turn 12 59.18uH
> Turn 13 70.55uH
> Turn 14 83.19uH
> Turn 15 97.15uHNeon Transformer / Primary Capacitor MatchingTransformer
> secondary voltage : 15.00kV
> Transformer secondary current : 30.00mA
> Number of transformers : 1
> Primary capacitor required to form a resonant circuit at 60Hz with neon
> transformer(s) : 0.0053uF
>
> --
> Thanks,
> ***********************************************
> Shelton Jacinto
> Email: hsheltonj@xxxxxxxxx
> ***********************************************
>
>
>
>
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