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Re: [TCML] Coil V5 - first light



Hi David,

JavaTC suggests the optimal coupling is in the 0.14 range.  However, for my prior, now extinct secondary, I got killer arcs when I got close to that.  Could have been cause by other issues - like the fact I put 0.12uF of cap in the tank. (now running 0.06uF)   But I'm wary of higher k.  Every time I mess with getting close to 0.14 or 0.13, I get badness.

I am going to measure the k directly, today, and will post the numbers.  

Cheers,
Joe




On Oct 23, 2010, at 4:24 AM, David Rieben wrote:

> Hi Joe,
> 
> Although this has nothing to do with your Dolphs "bubbling up
> on you", I did notice that your physical primary/secondary coupling
> looks rather loose to me. Your calculated k = .09 is probably "in
> the ballpark" but to my understanding, around .12 to .15 is usually
> considered in the optimal range for medium to larger SG driven
> coils. IIRC, the top plane of the copper tubing primary of my
> Green Monster coil system lies only about 1.5" below the level
> of my lowest seondary turn and this seems to work great for me
> (no racing sparks but plenty of good energy transfer).
> 
> David Rieben
> 
> 
> ----- Original Message ----- From: "Joe Mastroianni" <joe@xxxxxxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Friday, October 22, 2010 8:18 PM
> Subject: [TCML] Coil V5 - first light
> 
> 
> http://yfrog.com/n2rrfj
> 
> 8.5" x 34" secondary.  919 turns of heavy build 20ga.  6" x 24" toroid
> Using the same dreaded ribbon primary because I didn't want to have to build a new one yet.  Spacing between the top of the ribbon and the first turn of the secondary is 3.75".  k=0.09 calculated (not yet measured).  ARSG.  Pig running at about 30A.
> Sparks seem to be in the 6-7' range, but have yet to mount the larger toroid I'm working on.
> 
> Basically, needed to replace my 6.25"x24" secondary that burned last weekend.
> 
> Problem with this secondary is that the Dolphs bubbled up on me.  It went on w/o bubbles, and they emerged later.   I coated all week, at least 1 coat per day.   Could it have happened because it is much colder out then when I wound my prior secondaries?
> 
> Cheers,
> Joe_______________________________________________
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> 
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