Re: [TCML] Ferrite Beads, Terry Filters, NST protection

["resonance" <resonance@xxxxxxxxxxxx>]

I avoid the higher inductance chokes as they may cause a resonance with a 
neon sign xmfr.  I prefer a simple air core choke for this task.  Email off 
list and I will email you the schematic for the filter design I use with all 
nsts.

Dr. Resonance




----- Original Message ----- 
From: "Tim Meehan" <btmeehan@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, December 02, 2007 12:46 PM
Subject: [TCML] Ferrite Beads, Terry Filters, NST protection


> As I understand it, the Terry filter's purpose is to protect the NST from 
> HV
> spikes.  I was wondering if putting some small ferrite beads in series 
> with
> the high-wattage resistors would help lower the RF on the NST side of the
> filter?  I have some small beads (1/2 inch long, 1/8 inch diameter, with 
> the
> wire woven through the core of the ferrite about four times).
>
> My parts are still in the mail, I figured that I would build it and try it
> out.  I have looked a bit for ways to hook up to the signal on the high
> voltage without turning my o-scope into a smoking cinder.  I gather that 
> the
> current transformer is the accepted way to do that?  I also have a BNC 
> spark
> gap (lightning arrestor) that I was going to put in series with the scope
> too ...
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