Re: JavaTC and ETesla6 Questions

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Yurtle Turtle by way of Terry Fritz <twftesla-at-qwest-dot-net>" <yurtle_t-at-yahoo-dot-com>

You're right. I missed that. JavaTC gives me Cself of
32.74. I've seen two formulas for calculating Cself.
One gives me 23.6, while the other gives 31.22. The
second formula is pretty horrendous, and uses an H/D
factor. Apparently JavaTC uses something similar to
the latter formula.

In my last coil, this made little difference, since I
had a fairly low H/D. This proposed coil has a much
higher H/D.

Which formula is more accurate?

Adam

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Adam,
> 
> The toroid capacitance for Java TC is too high.  I
> "think" you want 33.36pF
> - The seconday coil's self capacitance of about 24pF
> for toroid
> capacitance.  That is about 9.44pF.
> 
> 33.36 - 23.92 = 9.44pF
> 
> Cheers,
> 
> 	Terry
> 
> 
> At 11:06 AM 9/1/2002 -0700, you wrote:
> >Please excuse the long post.
> >
> >I'm getting ready to build another coil, and was
> >attempting to use JavaTC and ETesla6, when I ran
> into
> >something that didn't seem right. To begin with, I
> >plugged the following into JavaTC:
> >
> >Secondary Diameter		8.125
> >Secondary Height		69
> >Bare Wire Diameter		.0403
> >Insulation Thickness		.0014
> >Spacing Between Turns		0
> >Toroid Major Diameter		24
> >Toroid Minor Diameter		6
> >Sphere Diameter			0
> >Top Terminal Reduction		0
> >
> >Which gave me:
> >
> >Number of Turns			1600.9
> >Inductance			58.22
> >Toroid Capacitance		26.5
> >Loaded Resonant Frequency	85.69
> >
> >OK so far.
> >
> >Then I used the following in ETesla6:
> >
> >*Grid Size
> >150
> >*Units of Measure
> >*1 = mm
> >*2 = cm
> >*3 = inches
> >*4 = Feet
> >*5 = meters
> >3
> >*1-Bare 2-Terminal
> >2
> >*Ceiling Height
> >188
> >*Wall Distance
> >120
> >*Primary Inner Turn Height
> >24
> >*Primary Inner Diameter
> >11.125
> >*Primary Outer Diameter
> >22.375
> >*Primary Outer Turn Height
> >24
> >*Strike Rail Height
> >0
> >*Strike Rail Diameter
> >0
> >*Secondary Base Height
> >25
> >*Secondary Diameter
> >8.125
> >*Secondary Winding Length
> >69
> >*Meaured Secondary Inductance
> >58.22
> >*First Top Terminal Center Height
> >94
> >*First Top Terminal Cord Diameter
> >6
> >*First Top Terminal Center to Center Diameter
> >18
> >*Second Top Terminal Center Height
> >0
> >*Second Top Terminal Cord Diameter
> >0
> >*Second Top Terminal Center to Center Diameter
> >0
> >*Top Terminal Voltage
> >100
> >*Begin Run Approval
> >1
> >
> >Which gave me:
> >
> >Ccalc		33.36432
> >Fcalc		114193.89
> >
> >Here's where it get's wierd. In order to "force"
> >JavaTC to match these results, I had to enter 97.6%
> >for Top Terminal Reduction. Is that possible?
> Surely I
> >made a mistake somewhere.
> >
> >thanks
> >Adam
> >
> >=====
> >Adam Minchey
> >yurtle_t-at-yahoo-dot-com
> >http://www.geocities-dot-com/yurtle_t/index.htm
> >
> 
> 


=====
Adam Minchey
yurtle_t-at-yahoo-dot-com
http://www.geocities-dot-com/yurtle_t/index.htm

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