Re: [TCML] Proper VTTC Coupling? (coil specs)

[futuret@xxxxxxx]

Dr John,

Thanks for that interesting information.  I have some
litz  wire which is 65/42 which may be suitable for my
project.  I can make comparisons using the litz vs.
standard wire.  I have another type of litz wire, but
I can't seem to find the spool.

John


-----Original Message-----
From: Dr. John W. Gudenas <comsciprof@xxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sun, 19 Oct 2008 2:08 pm
Subject: Re: [TCML] Proper VTTC Coupling? (coil specs)


John 
That sounds good. I have used magnet wire primaries up to 2kv on small 
811A VTTCs and didn't have any problems. 
 
Litz wire is a generic name for a technique to allow bundled wire to 
carry higher frequency currents with lower losses. 
This is one of those situations that you need a chart that uses number 
of strands and strand awg to check on frequency and current. 
Check this site for a quick idea: http://www.wiretron.com/litz.html ;
 
John W. G. 
 
John W. Gudenas, Ph.D. 
Professor of Computer Science 
On Oct 19, 2008, at 12:30 PM, futuret@xxxxxxx wrote: 
 
> John, 
>  
> My original plan was to use 16 or 14awg wire for that reason of > 
keeping the 
> coil short. The 12awg wire i have is a special type which will give > 
a primary 
> winding height of only 2.8". The 14awg wire would give the same > 
height. 
> But the 16 gau
ge wire I have has thinner insulation and would give a 
> much 
> shorter coil. I agree with what you're saying and I'm going to > 
switch to 
> 16awg for the primary. That will increase the primary inductance, > 
so maybe 
> I can use fewer turns too. That will let me put the grid coil on > 
top of 
> the primary. I've built coils both ways; grid coil on top, grid > 
coil below. 
>  
> I do have an air variable which I plan to use to find the proper > 
tune point, 
> then I'll replace it with a fixed cap. Actually I have an air > 
variable which 
> is in oil to withstand higher voltage and give a higher capacitance. 
> I've used the 4-125A tubes in previous coils, and also a 4-250A and 
> a 4-400A. The last tube was defective however and gave weak sparks. 
> I have a good selection of mica caps. 
>  
> Appearance-wise, I prefer a shorter primary coil also, so that's > 
another 
> reason for me to use the 16awg wire. It would be interesting to try 
> magnet wire for the primary coil. I have some 14gauge magnet wire. 
> I also have some litz wire, but I forget the gauge. I seem to > 
remember 
> hearing that litz wire is particularly helpful above 500kHz if I > 
remember 
> correc 
> tly. 
>  
> Thanks again, 
> John 
>  
>  
> -SNIP--------------------SNIP 
 
=C
2
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