Re: [TCML] Rotary Spark Gap and Safety Gap Behaving Weirdly [VIDEO]

[Brandon Hendershot <brandonhendershot@xxxxxxxxx>]

Your assumption is correct, The only things connected to the transformer
are the Terry filter and the RSG. Sorry all, I guess I had forgotten to
mention that.

This is just notice speculation, but I'm wondering if the arc from the rsg
would draw more current from the transformer. If that's correct, then my
thoughts were: when the rsg electrode gets far enough away to break the
arc, there would still be enough draw from the transformer to arc at the
safety gap.
I do have a dummy load that I can make use of if putting that in parallel
with the rsg would help you learn anything.

Oh, and I did make a John Freau phase controller not too long ago. I'll
leave the fiddling with that for first light

Ah, one more thing. From what I've collected it would be dangerous for the
tank cap and the transformer, but is there any way to run the coil with a
tank cap sized for a static gap?

Thanks,
Brandon H.


On Sat, Apr 13, 2013 at 12:24 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:

> Hi Brandon,
>
> I'm not sure that I have a clear picture of the circuit configuration.  Is
> it that you have only the RSG across the output of the Terry filter, with
> the cap & primary disconnected?  I'm thinking so, because if the L/C were
> hooked up, the arcing in the RSG would be much brighter, especially without
> a dummy load.
>
> Assuming my assumption is correct, I don't have a solid theory for why the
> presence of the RSG causes the safety gap to fire.  The Terry filter
> presents a small degree of capacitive loading to the NST and that may
> result in some resonant rise.  Perhaps the gap firing results in there
> being a longer interval to charge the capacitance...  Starting to talk
> through my hat here, I'd have to run it through a simulator to see if that
> holds water.
>
> If you're running the RSG without the L-C circuit to get a handle on where
> the sweet-spot of the SRSG is, be advised that adding the tank cap will
> change everything.  The final sweet-spot will be dependent upon the variac
> setting and tank capacitance.  I cannot strongly enough endorse the use of
> the John Freau phase controller for controlling the SRSG phase.  IMHO, the
> RSG phase is always something one should diddle in real time.
>
> Regards, Gary Lau
> MA, USA
>
> On Fri, Apr 12, 2013 at 6:41 PM, Brandon Hendershot <
> brandonhendershot@xxxxxxxxx> wrote:
>
> > Hi All,
> >
> > Decided to give my SRSG a spin with just the transformer hooked up, and
> > although it didn't explode catastrophically, it didn't play nicely with
> the
> > others. I took a video and put it up here:
> > youtube.com/watch?v=lBi0Rl9jLuU<
> http://www.youtube.com/watch?v=lBi0Rl9jLuU
> > >
> > MAKE
> > SURE annotations are ON (Left-most icon in the group of icons at bottom
> > right of the video player, looks like a speech bubble (On by default).).
> >
> > I'll summarize the issue here for archival purposes should the video ever
> > disappear. I've made sure to set the safety gap properly without the rsg
> > connected. The safety gap will not fire with the variac turned up to max
> > voltage, but as soon as the RSG is engaged, the safety gap will fire
> > immediately. After turning the variac down and extenguishing the arc, it
> > will reignite when re-approaching max (130-140V) voltage. Again, the
> safety
> > gap will NOT fire even at max voltage when the rsg is turned off.
> >
> > Thoughts, solutions, and further test procedures welcome.
> >
> > Thanks,
> > Brandon H.
> > _______________________________________________
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> >
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