Re: DC power on Tesla secondary (was 20 joules at 100 bps vs 4 joules at 500 bps)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Peter Terren" <pterren@xxxxxxxxxxxx>

Here is another example from the archives from two years ago.

From a post 8 Sept 03 (DC power on Tesla secondary - Nasty arcs)
Original poster: Bert Hickman <bert.hickman@xxxxxxxxxx>
" That gentleman was Lou Balint, a very experienced and knowledgeable East
Coast coiler. Lou connected two Fair Radio 0.1 uF 100 kV caps in series in
a voltage doubling configuration. These "hot" end of the capacitor chain
was connected to the base of the secondary so, elevating the base of the
secondary to a DC potential of 30 or 40 kVDC (I don't remember which). The
"low" side of the capacitor chain was connected to RF ground. The polarity
of the coil base could be switched to provide either a positive or negative
HVDC bias to the secondary. This allowed the secondary to be AC coupled to
ground through the caps while also permitting a DC bias to be added to the
RF output. Once a streamer connected to a hard ground, the HV capacitors
were able to discharge through the ionized path, making for very loud (and
dangerous) discharges. You certainly wouldn't want that nasty discharge
hitting either you or your unprotected primary winding. "

I am about to receive two 52uF 20kV caps.  It would be interesting to 
have a TC arc with 20kJ behind it.  It doesn't sound too hard on the 
cap in terms of voltage reversal either with the long arc in series 
with the inductance but it would be interesting to measure.

Peter
http://tesladownunder.com/



> i`ve got a friend (he`s registered at 4hv.org
> http://forum.4hv.org/index.php?board=;action=viewprofile;user=Alexey
> maybe even he`s subscribed at this list - we did communcate long time
> ago last time) - i showed him this photo and he tried to make
> something similar. i remember he connected a charged cap in series
> with secondary - in ground path. voltage on cap was around several kv,
> energy ~500j. he said the bang was quiet and the arc was glowing
> rather long period of time, but it was not so bright. as far as i know
> he doesn`t have any equipment to measure anything.
>
> b.t.w. - 75j is not enough for 10ka even if in the discharge path
> there`re no inductances at all, coz inductance of 6' of air is about
> 1.8 uH :-)