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Re: Rotaries and Neons (fwd)



---------- Forwarded message ----------
Date: Wed, 5 Aug 1998 23:23:30 -0500
From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Rotaries and Neons (fwd)

> Date:          Wed, 5 Aug 1998 20:55:49 -0600 (MDT)
> To:            tesla-at-pupman-dot-com
> Subject:       Re: Rotaries and Neons (fwd)
> From:          Tesla List <tesla-at-pupman-dot-com>

> 
> 
> ---------- Forwarded message ----------
> Date: Wed, 5 Aug 1998 16:57:24 EDT
> From: FutureT-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: Re: Rotaries and Neons (fwd)
> 
> In a message dated 98-08-05 01:21:37 EDT, you write:
> 
> << ---------- Forwarded message ----------
> > Date: Wed, 5 Aug 1998 09:49:59 +1200
> > From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> > To: tesla-at-pupman-dot-com
> > Subject: Rotaries and Neons
>  
> > Terry, Gary Lau and all,
> >                           I'm seeking an opinion here: if one uses a 
> > good RC filter with a NST, is there any remaining hurdle to using an
> > async rotary gap?
>  
> > Malcolm >>
> 
> Malcolm,
> 
> I don't see any real problem as long as the cap is small enough so
> it can fire regularly, so that the voltage never goes too high.  The 
> small cap should reduce the danger of extra-high resonant charging
> voltage build-up too.  The output will be weak, but I assume strong
> strong output is not your priority in these tests?
> 
> Regards,
> John Freau
> 

John, Malcolm, All,

OBIT's and the 30 mA type NST's seem to be very fragile and 
intolerant of even the slightest electrical abuse.  FYI, I once 
connected a 10 kV -at- 23 mA OBIT to a non-sync, variable speed rotary break
with no other components involved except the necessary spans of about 12 
inches of HV wiring between the two devices.  The OBIT died a rapid 
death, not even surviving a full 30 seconds!

If OBIT's and NST's seem to die just lookin' at 'em, perhaps the best 
protection device might be a black bag to put over them so you can't 
look at 'em.

Just thinking aloud now FWIW, perhaps one could try interconnecting the 
power supply transformer to the rest of the system with that special 
suppression core spark plug wire that is now commonly used in almost 
all high-energy automotive ignition systems.  It might provide enough 
damping of what must be very HF voltage spikes occuring in the 
OBIT/NST circuit.  Perhaps if that proves effective, a length of such 
wire could be wound around a PVC former ala an air cored choke.  
Comments welcomed.

Robert W. Stephens
Director
Lindsay Scientific Co.
RR1 Shelburne, ON Canada L0N-1S5
Tel or AutoFax: 1-519-925-1771    
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