Hi Matt,
Your formatting looks just perfect at my end.
If you were to use a mail client that had formatting, it's likely that the
List software that the TCML uses would discard the formatting.
Regards, Gary Lau
MA, USA
On Mon, Sep 22, 2014 at 2:50 AM, <romsigurthr@xxxxxxxxx> wrote:
> Hi David,
>
> Yes, my small SSTC in the video runs in two swichable modes; 1) direct
> antenna feedback at about 300Watts, and 2) VCO direct drive at about
> 200Watts. With feedback drive it is self tuning and couples well to the
> environment. This long of tube with such high ionization voltage presents a
> heavy load of about 200-240Watts, depending on orientation and proximity.
> This mode was shown in the video I linked. VCO drive allows for high
> fidelity audio modulation (see my channel's other videos for examples) but
> EM field loading causes an impedance mismatch as the secondary is pulled
> out of resonance. This serves as a current limiting feature which is useful
> for demonstrations where the unwary hand/tube might stray too close.
> Consequently this mode of operation is no good for driving high loads, such
> as my plasma tubes.
>
> Complete schematics, instructions, and build files are available for
> free on my website for anyone who wishes to use them. I do have direct
> feedback controller boards available for sale still too. I can provide
> information on the VCO drive for anyone who wishes as well but I did not do
> up documentation on it yet due to the terrible design engineering of the
> 4046 PLL chip, who's VCO I am making use of. There is no formula for
> determining the VCO frequency based onRC parameters, and the user must
> interpolate values from a low resolution graph in the datasheet. I've found
> a new VCO chip that works far better, but it only comes in the TSOT-23
> package, which is MUCH smaller than a single grain of short-grain rice!
> Perhaps in the future I'll do up a proper design document for the new VCO,
> for now it is too much hassle and very little interest has been shown so
> far.
>
> If I might ask a favor of the list; is the formatting of my responses
> messed up to anyone? It appears on my end that word wrap is disabled. I
> REALLY hate win8.1's new Mail system/program and its lack of formatting
> controls. I am currently typing this reply in notepad and I will paste it
> into the mail program/app to see if that helps. Thanks!
>
> --Quote--
> Hi Matt,
>
> Thanks for the clarification and the cool video link. One thing of
> interest I noticed on your video is how your tube "loads" the output of
> your TC when it ignites and the discharge plasma of the coil is noticeably
> diminished.
>
> David
> --Endquote--
>
>
>
>
>
> Sincerely,
> Matt Sig Giordano
> Sigurthr Enterprises
> www.SigurthrEnterprises.com
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>
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