Re: Terry filter alternates?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Esondrmn@xxxxxxx 

Gary,

Yikes, that voltage is high.  It looks like I should go to the .03 ufd cap 
and probably drop the series resistors down to 1 or 2 k each.

Thanks,

Ed Sonderman



In a message dated 12/9/04 7:08:26 AM Pacific Standard Time, 
tesla@xxxxxxxxxx writes:

> Hi Ed:
>
> An R-C filter without the C's just isn't a filter and will do little to
> shunt HF transients. Also, a total of 6K in series with your NST will
> consume a lot of power.
>
> Since you are running a close-to-resonant sized cap with a sync RSG, I
> am concerned that your peak charging voltage may be hazardous.  I'm
> repeating my measurements below with my 15/60 NST and various cap sizes,
> and it shows how the bang voltage (BV),  increases with decreasing Cp.
> I was afraid to try below .02uF, but it's easy to extrapolate where your
> .015uF might fall.  Also, the voltages I recorded were the bang
> voltages, not the peak charging voltages, which were considerably
> higher.
>
> Perhaps your 6K of resistance helped current limit the charging and
> prevent destruction?
>
> Measured at 140VAC in:
> Cp   BV   W
> .02uF   24.4kV   714W
> .03uF   21.9kV   863W
> .04uF   19.6kV   922W
> .05uF   17.1kV   877W
>
> Regards, Gary