Re: [TCML] Terry Filter Caps Suffering From Early Death

["DC Cox" <resonance@xxxxxxxxxxxx>]

Yes, contact me off-list and I will email the data to you.

I use a pair of inductance chokes next to the output going over to the spark
gap.  This tends to clip the most nasty of the spikes allowing the Terry
filter to despike the rest of them.

I also use one additional cap in each series leg of the Terry filter to
raise the overall potential value of the cap string.

Dr. Resonance



On Sun, Jun 15, 2008 at 2:06 PM, Scott <doxiescott@xxxxxxxxx> wrote:

> Hello Everyone,
>
> As I work on my second coil, it has come time to install the NST
> protection.  One very odd problem I noticed with my last Tesla Coil, a
> 9/30, is that the caps on the Terry Filter would periodically blow out
> for no apparent reason.  Even with a RF ground directly in the Earth
> and no sings of arcing through the filter (with the exception of the
> safety gap), the caps at the end of the strings would die for no
> reason.
>
> The filter is grounded with a single 10awg wire 1 foot long going into
> a 2 foot long 6awg car battery cable going directly to my grounding
> post.  It's positioned 2 feet away from the NST.  When a cap blows
> out, it seems to have little effect on the coil performance, but as
> soon as one goes, the ones behind it blow up very quickly.
>
> Now the second coil is a 15/60, 3 times the power of first, and I
> would like to get this issue resolved.  Does anyone have a possible
> answer to why this is happening?  Is there a more robust alternative
> to the caps recommended in the Terry Filter recipe:
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=P10501-ND
>
> Thanks for any help with this problem.  I'm sure the Filter has done a
> great job protecting the coil, its just annoying replacing these
> little 60 cent caps every 5 minutes of run time or so.
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>
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