[TCML] New Torroid
Sfxneon at aol.com
Sfxneon at aol.com
Mon Sep 8 11:56:43 MDT 2008
Thanks for the nice comments and suggestions. This is the right time for
making the final changes to the coil before I commit to a final design. I'm just
ironing out all the bugs and trying to build a reliable, safe and portable
system that can be moved around easily.
I'll probably lower the coil to the ground by eliminating the round table,
except for when I want it to strike the steel roof trusses. There's nothing in
that building to burn or be bothered by HV strikes, and those connecting
streamers to the arched steel trusses look really cool! This place was an iron
works since 1946, and has high vaulted ceilings in the big room, which is over
5000 square feet.
I've been trying different heights with the torroid, and seeing firsthand
the tradeoff between shielding the top turns by lowering, and raising to prevent
primary strikes. There is no really good setting, so I'm going to try a
smaller torroid right above the last turn so that the big torroid can be elevated
away from the primary.
The battery clip on the primary is only for the initial testing and will be
replaced by something below the coil as you suggest. That's something I'm
still working on in my head, how to make a slider mounted on the primary base
that allows easy tapping from underneath.
In a message dated 9/8/2008 10:21:40 A.M. Central Daylight Time,
bert.hickman at aquila.net writes:
That's a nice, clean looking coil... and its throwing some very mean
Some potential suggestions:
Reduce the overall height of the system by reducing the length of the
bottom legs. This will give you more top clearance to reduce strikes to
the ceiling, conduit, plumbing, or (heaven forbid) fire, burglar alarm,
or loose CAT5 wiring.
If the toroid is too high (versus the secondary), you may develop a
conical region of "Christmas tree" corona between the top of the
secondary winding and the primary that can stimulate secondary:primary
strikes or racing sparks along the secondary. Try reducing the height of
the main toroid, increasing its diameter, or add a smaller (15 - 20"
diameter) field grading toroid between the secondary and existing
toroid. These measures will reduce the E-field gradient seen by the top
of the secondary, increase effective shielding, and help throw streamers
outward, and away, from the primary.
In one picture it looks like you may be using a large alligator clip as
a primary tap on the top side of the primary. This can be a tempting
target for streamers or even strikes from the upper portion of the
secondary winding. Try tapping from below if you have sufficient space.
In any event, minimize projecting height of the tap above of the primary
winding so that you maintain a smooth E-field at the primary's top
Good luck and best wishes,
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