The Great Coil
November 2, 2018
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The great coil and plasma jet in place under the Disk frame
In this configuration the black coils are the primary and the white above is the necklace coils. Each of the necklace coils is a single loop terminated at a condenser unit distributed around the circumference of the disk along with the driving primary.
HV Coil with Pincushion plasma cone
The Original Device
bottom of old coil deck, coil is welded to the other side of the central portion of the device.
The original device was constructed of welded polypropylene, the bulge rings were built in condensers that were terminations of a necklace of wired loops bundled with the primary loop of the Great Tesla coil. During early testing the condensers failed and could not be repaired. All of this outer works was cut away to salvage the Great Coil.
Flat spiral wound tesla coil with central pincushion/plasma jet
The central part of this device is the flat wound spiral coil. This coil is created from about 1200ft of 14 gauge copper wire, 120 turns, at 5 turns to the inch, fixed with 5/32″ polypropylene rod welded to the 1/2 inch thick polypropylene deck. The insulation value between winding turns was tested to 40,000 volts per turn or 4 million volts of stress for the entire coil. The coil center termination is a 8 inch disk with pins set in a 1/4 inch grid for 16 pins per inch square. The pincushion is inside a polypropylene forcing cone that terminates with a 2 inch plasma conduit. The necklace bundle is just visible inside the ring of the left picture, the central discoloration is the coil it’s self spiraling out from the pincushion/ plasma cone. During initial testing of the device, it was being directly powered from the 15,000 volt transformer when a lead came loose and began arching. The coil went into full Tesla mode of about 2 million volts at the pincushion. A violet plasma jet 6 feet high erupted from the cone! After 25-30 seconds the loose wire came free and the system died.
Some of the built in condensers were damaged and could not be repaired. The Great Coil was removed from the damaged device for further use as it would be very difficult to replace …pg
For a description of the Tesla Coil driver parts see: Pictorial of parts.
For a description of the Tesla Coil driver see: primary-driver
for the layout and parts test of driver: condenser-sparkgap-test
These above links will open new tabs so you won’t get lost…pg