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

["DC Cox" <resonance@xxxxxxxxxxxx>]

The function of the resistors in a Terry filter is NOT to limit current.
Their main function is to spoil the Q factor of the circuit thus preventing
harsh high current spikes from reflecting back towards the nst transformer.
You still need them.  I divide mine into two on each leg ---- one just
before the caps to ground and one just after the caps to ground.  I use 300
Ohm 25 Watt resistors --- four of them.  Also a small RF choke.  Contact me
off-list if you want my schematic.

Dr. Resonance





On Sun, Apr 6, 2008 at 8:01 AM, Thomas Ryckmans <thomas.ryckmans@xxxxxxxxxx>
wrote:

> 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#518513727854380
> 5698
>
>
>
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