Re: [TCML] First ever Pig SISG.... inadvertently

[FIFTYGUY@xxxxxxx]

In a message dated 2/4/08 8:11:59 P.M. Eastern Standard Time,  
teslas-intern@xxxxxxxxxxx writes:

>    I don't know anything about SISG, but if I  understand Phil's setup 

>he has no filter cap on his rectifier.  
 
    That is correct. None at all.
 
>Would that not lead to phasing problems if he got his bps around  120, just 
like a sync AC gap,
> or does something else come into play that causes  that to be a moot factor 
 
   Well, there is the inductive ballast on the primary  side of the pig, so 
there is some reactive components involved. But there's  nothing downstream of 
the rectifier to do any filtering except the primary  cap. The goal is to get 
the thing to run as low a BPS as possible - basically  to aim for 120 BPS as 
the most efficient. I can certainly say that as I  continue to add more primary 
cap, the BPS keeps coming down and the sparks get  better. I would *guess* 
I'm running around 500 BPS. But I can hear when the  sparks load it down just 
right, and it gets an awesome metallic modulating  noise and then it just roars! 
It's done the same thing when I ran my  SRSG through the same coil.
 
> or does a filter cap make no difference).  
 
    Good question - if I'd read this post three hours  ago I would've tried 
it tonight!
 
>Also do you need a charging choke for an SISG coil?  


I believe that the design papers for the SISG  using MOT's have chokes on the 
HV side mainly for ballast purposes - again  they limit the source impedance 
of the power supply which then sets the SISG's  BPS. I think it also helps 
block RF getting back to the mains (wishful  thinking?) I'm running ultrafast 
diodes in my bridge, unlike anybody else, so  I haven't worried about filtering 
back to the Pig.
    I am running two 200 Ohm 100 W power resitors in  the DC line, but 
they're there to protect the bridge against surges. I wish I  knew if they were 
doing that job...
 
>Please excuse my ignorance!


    Scott, please excuse *mine*! I really don't know  what I'm doing. So if 
*I* can make it work, and not break it, anybody can do it!  Those of us doing 
the SISG thing are utterly confused why everybody else hasn't  jumped on the 
bandwagon!
 
-Phil LaBudde

Center for the Advanced Study of Ballistic  Improbabilities



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