Re: [TCML] Single-ended NST, wiring

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

On 3/5/13 10:34 AM, jhowson4@xxxxxxxxxxx wrote:
> Hmmm. I wonder why this configuration is so prevalent in the small
> kit coils available from information unlimited

If you have a single ended transformer, it works ok. Kits are often 
ad-hoc historical designs and many are built, operated a few times and 
never operated again, so durability and long term performance aren't big 
issues.  A lot of kits use DC rated doorknob caps, which also have long 
term degradation issues in this application.

 and in the larger ones
> used at resonance research and the like then.

Larger coils do have voltage rise issues, and tying one terminal to 
ground is a good way to deal with it.  And, if you've built a coil a 
particular way and been successful with it, you tend to stay with it.


 For the purpose of
> limiting that voltage rise perhaps? If the dangers are reasonably
> high, then one would think the kits would be engineered away from
> this configuration. Heck the little information unlimited BTC-30 I
> built years ago, does not even have an RF ground, it just uses the
> house ground, with no problems I might add.

No problems that you're aware of <grin>...

I doubt that there's much "safety engineering" that goes into IU kits.

A lot of TC mfrs and commercial operators rely on strategies like:

1) have small assets (small insurance) so that if things go wrong, 
there's nothing to sue for.

2) carry liability insurance for performers and special effects.

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