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Re: Terry filter alternates?



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