Re: Protection Circuit

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

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

The protection circuit is a low pass filter, however you overlooked the fact
the resistor is a wire-wound resistor with inductance. I use a 1k resistor
with 255uH of inductance which reduces the 3 dB point. No I dont consider
the source unductance only the filter. I use 428 pF of shunt capacitance on
each leg of my NST which is center grounded.
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Mon, 22 Apr 2002 17:15:50 -0600
> To: tesla-at-pupman-dot-com
> Subject: Protection Circuit
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Mon, 22 Apr 2002 17:18:07 -0600
> 
> 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
> 
> 
>