RE: [TCML] Single-ended NST, wiring

[Brian Hall <brianh4242@xxxxxxxxxxx>]

One thing to be careful of in both those drawings linked to is the ground connection.In general two parts of a Tesla coil should be grounded: the secondary coil to a ground plane or earth ground, and the low voltage end of your HV transformer (the part that plugs into the 110/220 VAC wall socket).
You do not want to ground the high voltage (and also high current)  primary (tank) circuit - the part with the gap, the cap and the primary coil as shown in the second drawing - and as mistakenly shown in the first pic linked to, you most definitely do not want to have a physical wire connection between the primary and secondary coil.  You may have seen a coil drawn like that with Tesla's name associated it, and such coils exists for example an auto ignition transformer - but those are sealed tight in plastic casings filled with oil.  
In the more traditional sense of a Tesla coil discussed here, power travels through the tank or primary circuit to the secondary circuit just by being near it without physically touching, through electromagnetic inductance. No physical connection between the primary and secondary coil is needed or desired an an air-core Tesla coil.

----------------------------------

Brian Hall   




> From: pastor@xxxxxxxxxxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: RE: [TCML] Single-ended NST, wiring
> Date: Sat, 2 Mar 2013 16:51:25 -0600
> 
> I've always used the "capacitor in series" configuration
> for my SGTC's... works great.
> 
> 
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Jacob Karlström
> > Sent: March 02, 2013 2:08 PM
> > To: tesla@xxxxxxxxxx
> > Subject: [TCML] Single-ended NST, wiring
> > 
> > Hello,
> > 
> > The NST (4kV, 50mA) for my SGTC is a single end type with one of its
> > secondary winding ends attached to the metal casing. I have seen schematics
> > of other TCs with single-ended transformers, and they have all looked like
> > this: http://www.physics.gla.ac.uk/~kskeldon/PubSci/images/tesla3.gif with
> > the capacitor in parallel with the transformer and coil. However, I recall
> > reading that a capacitor in parallel is not preferred in a TC using an NST.
> > I am wondering if connecting the capacitor in series instead like this,
> > http://imgur.com/JegqUiI, would work, or will there be any problems with
> > the capacitor + ground?
> > 
> > Regards,
> > 
> > Jacob Karlström
> > _______________________________________________
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> > Tesla@xxxxxxxxxx
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> > 
> > 
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