RE: [TCML] Terry filter - does one need the current limiting resistors with a current limited NST?

["Lau, Gary" <Gary.Lau@xxxxxx>]

Hi Thomas,

The resistors in a Terry filter are not for limiting current.  With the Terry filter caps, the resistor forms an R-C low-pass filter, to attenuate very high frequency high voltage transients en route to the NST.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Thomas Ryckmans
> Sent: Sunday, April 06, 2008 11:01 AM
> To: 'Tesla Coil Mailing List'
> Subject: [TCML] Terry filter - does one need the current limiting resistors with a
> current limited NST?
>
> Hello,
>
> Constructing the Terry Filter now... does one need the current limiting
> resistors with a current limited NST? Mine is 6kV 50 mA
>
> Cheers!
>
> Thomas
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf
> Of Helen Lo
> Sent: 05 April 2008 01:27
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] new spark gap
>
> Thomas -
>
>   Interesting design; do you plan to add a fan?
>
>   I have three areas of possible concern:
>
>   1. The wood base. Even with a only a 6KV supply, you may run into problems
> with carbon tracking of the wood between the angle brackets. Much better
> would be to use a plastic baseplate, like a cheap polyethylene cutting
> board.
>
>   2. The through-bolts used to secure the angle brackets to the base. Unless
> you were careful to counterbore the underside of the base so the bolt heads
> are recessed, you may have problems with arcing from the bolt heads to
> whatever surface you set the base on, especially if you set it on concrete,
> etc.
>
>   3. The single bolts used to secure the copper tube segments to the angle
> brackets. No matter how tight you make the bolt, a slight bump on a copper
> tube will cause it to rotate out of alignment. Adding a second bolt will
> lock the alignment so it cannot shift.
>
>   Regards,
>   Scott Hanson
>
> Thomas Ryckmans <thomas.ryckmans@xxxxxxxxxx> wrote:
>
>
> Hello,
>
> I'd like to have your thoughts on my new spark gap (image 6)
>
> http://www.pupman.com/current/tryckmans/index.html
>
> for a small coil running on a 6kV 50 mA NST
>
> Many thanks!
>
> Thomas
>
> Or here:
> http://picasaweb.google.com/Thomas.Ryckmans/TeslaStuff/photo#5185137278543
> 80
> 5698
>
>
>
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