RE: Protection Circuit

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jim-at-jlproduction-dot-com>

Hi Don,
I'm sure MANY will disagree with me here, and I am certainly no expert
but...
After probably 50 or so runs on my small coil (9KV/30ma NST powered)
I have had no failure yet. Even with it savagely out of tune, way too
much topload and main gap set to "oh my word" big.
I run a safety gap, properly set, and that’s it.
Works so far anyway,
Jim
http://www.jlproduction-dot-com/Tesla.html
(My coil chronicles and online coilers forum)

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent: Monday, April 22, 2002 7:16 PM
To: tesla-at-pupman-dot-com
Subject: Protection Circuit

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<dlynch-at-reyercorp-dot-com>

Hello,

I am studying various circuits from several people and it seems the
protection circuit is 
a low pas filter, like Terry's small coil specs, where he uses 360pF and
5K
resistor 
which gives a 3dB point of 88.4kHz. Is it that straight forward or do
you
really need to 
factor in the secondary inductance of the NST?

My daughter is doing a High School project and I am trying to explain
each
section of 
the circuit based on what I use to know and have long since forgotten.

I have also seen RF chokes used in the protection circuit. Is it really
necessary?

I have a OBT 10Kv 23mA and so we are on the low end of the power
spectrum.
I've 
ordered some 400pf 30KV doorknobs and so I guess a 5K resistor seems
just fine.

The more we include, the more has to be explained and I want to keep it
as
simple as 
possible so it doesn't tax my brain too much.

Thanks.

Don