RE: [TCML] RSG Upgrade Performance Video

["Phil Tuck" <phil@xxxxxxxxxxx>]

Gary,
It is possible although it is a 'bodge' method. I have managed to do the
same but only ever on a dummy secondary load. 
My SRSG was built for 200 bps and uses a timing figure of around 0.65 mS,
that is, the phase controller ensures the presentation occurs 0.65 mS after
the mains sine wave has reached its peak. #This ignores the real world where
you have spark advance to the approaching electrode. (see end)# 
This figure should give four nice equal sized voltage peaks if you do a
spice sim (see Richie's site for spice downloads). If you alter the timing
to [say] 2.65 mS using the phase controller, you find that two of the firing
peaks are sufficient, while the other two are so small as to be pointless,
as the cap has just not had enough time to charge with the timing that the
phase controller has caused to happen.
My SRSG disc is held on to the motor's hub by three bolts, and I used the
strobe effect from the SRSG's spark to view these bolts, you could clearly
see the image change. I think [though can't actually be sure] they went from
six images to twelve images of the bolts (remember there were just three
actual bolts), but you get the general idea. The sound also altered quiet
noticeably, more so than in Jeremy's video because I had no streamer noise.
I did have a YouTube video of it but ditched it in a clear out, so some
members may have seen it.


##I don't want to ask anyone to suck eggs so for those who don't know the
spark advance is taken care of by the fact you tune by listening to the
sound of the coil, so when you get the optimum sound - which in a sim for
mine is 0.65mS - it is in fact a larger figure in reality because of the
spark advance issues.


Regards
Phil Tuck

www.hvtesla.com



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Gary Lau
Sent: 10 June 2011 03:08
To: Tesla Coil Mailing List
Subject: Re: [TCML] RSG Upgrade Performance Video

Hi Jeremy,

I can definitely hear the two distinct tones in the video, with superior
performance at the lower one.  But I'm having trouble imagining how the
Freau phase controller could allow one to dial in 120 or 240 BPS.  In my
experience, varying the phase control Variac will vary the spark length from
virtually nothing at an early phase setting, to maximum performance, and
going further (later) will cause the safety gaps to fire and stuff just gets
messed up, timing wise.

If you have a scope, I would encourage you to just put the probe in the
general vicinity of the operating coil and verify the BPS.  You should also
be able to see a relative bang size; see if that varies with the phase
Variac.  It should.

And a general comment about videos.  Everyone values different things, but
to me and maybe others, it's not just about the sparks.  Let's see the rest
of the coil too!

Regards, Gary Lau
MA, USA



On Thu, Jun 9, 2011 at 9:29 PM, <jeremyee@xxxxxxxx> wrote:

> List,
>   I just wanted to share some success with my upgraded coil with my 
> new SRSG. It sure made a big difference though I still have work to 
> do. I currently am only using the static gap recommended LTR 
> capacitance on my 15 kV, 120 mA NST powered coil. Operating at 120 
> bps, the safety gap only fires occasionally. By tuning the phase using 
> a Freau phase controller I can "switch" between 120 bps operation and 
> 240 bps operation. It definitely gave a better output at 120 bps. Here are
the videos:
>
> 120 bps hitting ladder, 4 ft arcs
>
> http://youtu.be/xYIN6S5Ai2k
>
> Varying between 120 bps and 240 bps with phase controller
>
> http://youtu.be/QjlH_u--P0o
>
> Thanks a lot!
>
> Jeremy
> Cincinnati
> Sent from my BlackBerry device from Cincinnati Bell Wireless
>
>
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