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

["Tesla list" <tesla@xxxxxxxxxx>]

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

I don't have any independent information on this setup.  I am sure he 
just meant that the caps were in series to double the voltage they 
could charge to.  The 0.05uF (two of  0.1 in series)  is a bit close 
to the tank cap size and there would have been a significant AC 
component on top of the DC although charging a 200kV cap to 40kV is 
very conservative.  Otherwise the caps only really need conservative 
DC ratings unlike the tank caps.
Just charging the caps to 40kV would have been a bit of a challenge 
as you can't use a conventional voltage multiplier as it needs to be 
earthed.  A flyback would do if a bit underpowered.
Changing the 'bias' or DC polarity of the caps is presumably just a 
case of reversing the diode rectifying the HV.  Very likely done 
between runs with well discharged and shorted caps.

Peter
http://tesladownunder.com/

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, August 12, 2005 10:12 AM
Subject: Re: DC power on Tesla secondary (was 20 joules at 100 bps vs 
4 joules at 500 ...


> Original poster: FIFTYGUY@xxxxxxx
> > In a message dated 8/11/05 9:24:15 PM Eastern Daylight Time, 
> > tesla@xxxxxxxxxx writes:
> > 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.
>
>     Could you elaborate on this configuration? Sounds like a couple 
> of caps in series with the base of the secondary, I don't see how 
> the "voltage doubling" comes in. It also sounds like these 
> "booster" caps have to be of the same ratings as good primary caps.
> 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.
>
>     How was this switching accomplished, and was it dynamic or a 
> matter of changing connections before a run?
>
> -Phil LaBudde