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Re: Tesla Twin Configurations



---------- Forwarded message ----------
Date: Thu, 2 Oct 1997 09:04:24 +1200
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
To: tesla-at-pupman-dot-com
Subject: Re: Tesla Twin Configurations   

Fr McGahee,
            A light just went on in my head. Here is the reason the 
twin's base connection will *never* be completely at ground potential:

*The zero voltage point occurs a small way up the driven resonator 
winding!!!!*  Why?  Imagine you separate the rest of the resonator 
from the bottom few turns. Now it is obvious isn't it? :)  So now, 
the *best way* of implementing this scheme becomes clear: use a
separate driver transformer with the midpoint of its secondary tapped
and connected to ground. Now both bases are elevated as before (and 
now in the opposite polarity), but pri-resonator clearances are no 
longer an issue :)
   BTW, I didn't use multi-layered secondaries either.  

Malcolm

> From: Thomas McGahee <tom_mcgahee-at-sigmais-dot-com>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Tesla Twin Configurations  
> 
> 
> 
> ----------
> > From: Tesla List <tesla-at-pupman-dot-com>
>  > To: tesla-at-pupman-dot-com
> > Subject: Re: Tesla Twin Configurations  
> > Date: Wednesday, October 01, 1997 12:10 PM
> > 
> > 
> > 
> > ---------- Forwarded message ----------
> > Date: Wed, 1 Oct 1997 19:27:53 +1200
> > From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Tesla Twin Configurations 
> > 
> <SNIP>
> system.
> > The disadvantage is that the resonator imbalance causes the base of
> 
> > the driven resonator to be at some elevated potential (small) with 
> > respect to ground.
> > 
> > Malcolm
> 
> Sorry about my mistakenly mentioning that your twin had a core.  But
> at least I got everything else right.
> 
> I really do want to voice one note of caution here. If you approach
> either of these secondaries in mode (4) it will imbalance them both
> and the connected base point will shift away from some (small)
> elevated potential to some (much LARGER) elevated potential. This is
> particularly true if you are one of those people that likes to draw
> arcs from the secondary to either a grounded rod or your body. This
> is what I meant by finicky operation. It can be easily disturbed by
> nearby objects. ALL Tesla coils can be slightly detuned by the
> presence of large objects, but when neither base is ground
> referenced, the effects are much more pronounced. In my own table top
> experiments using coils that were 4" diameter and 18" tall, coming
> too close to the first secondary caused arcs to burst through the
> poly insulation that I had placed as insurance between the primary
> and (first) secondary. It went across 2" of air space and through 120
> mils of poly. If you are aware of this problem then you can take the
> proper precautions to prevent your coils from being burned.
> 
> Hope this helps.
> Fr. Tom McGahee
> 
> 
> 
> 
> 
> 
>