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Re: More facts: Coil size to faraday cage size ratio

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

I get the ones at the top of the page that "fit". I have a bunch of 240-2078 and 240-2079. They fit over cables well. There is no science to it, just get the ones that fit. They are cheap. Use as many as you want, but the closer they are to the gap the better. They can be used all over the place for all kinds of things too. Heating is nil. I see they have a bunch of new sizes these days ;-)

I like the solid ones since the snap on type tend to "snap off"... Put heat shrink over them if they are going to be bounced on concrete and such. You can see them on the primary cables here:

http://hot-streamer.com/TeslaCoils/MyCoils/SmallCoil/small_coil2.jpg

They are like little RFI sponges ;-))

There was a thread awhile back about "stealth coils"...

Dual stage line filters are next in line, but they are expensive.

NST LTR sync gap systems here...

Cheers,

        Terry


At 08:31 PM 11/23/2004, you wrote:

Terry:

Which part number did you use?

What was xmfr size?   Total cap size?

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, November 23, 2004 7:58 PM
Subject: Re: More facts: Coil size to faraday cage size ratio


> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi,
>
> I also second the use of big ferrite cores liberally placed around the
> primary and especially at the spark gap.
>
> Right before the spark gap fires, there is a lot of energy stored as
> capacitance between the gap electrodes.  When the electrodes fire, that
> energy is shorted out without much R and L in the way which causes giant
RFI.
>
> All my spark gap coils have ferrites but I never think about them much
> since they are passive things.  Note my big gap that has ferrites directly
> on the electrodes:
>
> http://hot-streamer.com/TeslaCoils/MyCoils/BigCoil/Rgap.jpg
>
> I can't really quantify how much they help, but they do reduce RFI "a
bunch".
>
> DigiKey sells them from very small to pretty big:
>
> http://dkc3.digikey.com/PDF/T043/0793.pdf
>
> Maybe you just need to cage the spark gap.
>
> Also, streamer just to air will have far less RFI than streamers striking
> to ground.
>
> Hope this helps!
>
> Cheers,
>
>          Terry
>
.............