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Re: Craig's SGTC (plus SSTC)

Original poster: "Craig Dunn" <craig_d73@xxxxxxxxxxx>


1) There seems to be a typo on your primary write-up. It says the conductor is 10 mm diameter and 10 mm long. Shouldn't that be 10 m instead? 

Oops.  Yes that should be 10m.

2) In humid weather, your string tie-downs could become somewhat conductive, causing an intermittent high-resistance short in your primary

Initially I was concerned about the conductivity of the string, but I did a few simple tests and it worked okay, so I decided to stick with it.
Although I didn't add any moisture to the string while testing it, so my tests were not extensive. It'll be easy enough to replace it with something more insulated if need be.



From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Craig's SGTC (plus SSTC)
Date: Sun, 10 Jul 2005 14:22:03 -0600

Original poster: Mddeming@xxxxxxx


Hi Craig,

Very neat job! Two things I noticed:
1) There seems to be a typo on your primary write-up. It says the conductor is 10 mm diameter and 10 mm long. Shouldn't that be 10 m instead?
2) In humid weather, your string tie-downs could become somewhat conductive, causing an intermittent high-resistance short in your primary
In a message dated 7/10/05 2:25:37 P.M. Eastern Daylight Time, tesla@xxxxxxxxxx writes:
>Hi,
>
>I've just started to get decent streamers from my first SGTC so I thought
>I would post the results. The setup is:
>
>* 4 MOT Stack Power Supply (no oil)
>* Inductive Ballast (limits current draw to 10A).
>* 80nF MMC (was originally beer bottles).
>* Asynchronous Rotary Spark Gap
>* 110mm Diameter Secondary (1000 turns 0.55mm wire).
>
>At the moment I'm getting streamers which are over 1 meter long. I've
>only just started tuning the coil, so it's not performing at it's best
>yet, but I seem to get good results with around 2 turns on the
>primary. My original calculations led me to believe that best results
>would be between 3 and 4 turns on the primary, but this doesn't seem to be
>the case.
>
>Pictures of the coil and it's streamers can be found on my website
>(www.craigsarea.com/sgtc.html). Scroll to the bottom of the webpage for
>streamer pictures.
>
>Previously I made a SSTC, which is also on my website
>(www.craigsarea.com/sstc.html). I really like the robustness of spark gap
>coils. An out of tune spark gap coil just results in poor performance,
>whereas an out of tune solid state coil often results in having to
>desolder the MOSFET's. I also think the streamer behavior of spark gap
>coils is more pleasing than solid state coils.
>
>Hope you like it,
>
>Craig.