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Re: Safety gap taking over
Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
Your Terry filter should definitely be in a separate box with the power
xmfr. Mounting it directly under the primary is asking for trouble. Need
to remember the primary coil has a symmetrical magnetic field, both up and
down, so if it couples upwards into your sec coil it will also couple
downwards through any plastic or wood with absorption --- except your filter
wires, etc.
Dr. Resonance
Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo WI 53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, February 23, 2004 11:48 AM
Subject: Safety gap taking over
> Original poster: "Jeremy Gassmann" <gmann-at-fuse-dot-net>
>
> Hi everyone! Last night I had my first light after my first failure.
> During the failure, my homemade parallel plate cap internally arced over
> so I decided to go the Geek group MMC route. I will give a quick
> rundown of my specs:
>
> PS: 4 - 15 kV 30 mA NST's wired in parallel
> Cp: 32 nF Geek group MMC
> Terry filter with safety gap set to just NOT fire (safety gap is just 3
> brass balls about .5" in diameter)
> 8 segment static spark gap using 1" copper pipe couplers set to just
> fire
> Secondary: 980 turns of #23 on a 4.25" diameter PVC form (which I think
> is too small given my input power)
> Topload: 4.25" x 23" toroid made from black drain pipe covered in Al
> foil tape
>
> Here is my problem:
> While running the coil, as I turn up the input power the spark gap
> begins to fire and as I turn up the voltage more, the safety gap does
> the job of the spark gap. Keep in mind that I set the spark gap to just
> fire and the safety gap to just NOT fire. When I set the spark gap to
> just fire, the safety gap was hooked up as well. Does that change the
> breakdown properties of the spark gap? I would think that it wouldn't,
> but I am not sure. I even bridged a few of the gaps in the spark gap to
> reduce the firing voltage but the safety gap sometimes will take over.
> I also have my Terry filter safety gap mounted upside down on the
> underside of the primary shelf. I don't know if this would affect
> anything or not, but with no load at all, the safety gap acts like a
> Jacobs ladder. Also interesting to note is that when the safety gap
> takes over the output still seems really decent...about 4' streamers
> once the surrounding air is sufficiently hot. I also use a leaf blower
> to quench the spark gap that seemed to make the safety gap take over
> even faster. Is there too much air flow here? Sorry for the long post,
> but this has me a little confused. Is the safety gap subject to a sort
> of avalanche effect where it fires ones, gets hot then keeps getting
> hotter and firing more often until it takes over? Thanks to all in
> advance for your help! I know it has been stated a lot, but without
> this list, there would be significantly fewer successful amateur coilers
> out there!
>
> Jeremy Gassmann
> Cincinnati, Oh
> http://jeremyee.tripod-dot-com
>
>
>