History of my flat spiral coil
December 19, 2011
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Post about origin of my Flat wound Tesla coil
Flat spiral wound tesla coil with central pincushion termination
History and details of this device.
This Tesla Coil was created in 1994 as the base of my first test device. A spiral of 14 gauge copper magnet wire was welded onto a deck of half inch polypropylene with over a mile of 5/32 polypropylene rod, 5 turns to the inch, for a total of 120 turns and 1200feet of wire. The insulation was tested with a HV 40,000 volt weld tester over every inch of the coil weldment, for a high”Q” coil that can withstand up to 5,000,000 volts of stress. A spiral wound coil is the Tesla design that creates the highest stress at the coil center with the perimeter at “ground” for the safest design as well as the sharpest voltage spike is at the center due to magnetic field collapse pinch. This center termination is a pincushion 8 inches in diameter with 16 pins per square inch. This is inside a polypropylene forcing cone for a plasma conduit / jet. This was circled with a capacitance / inductance necklace that served as the primary that was driven at first with a 15,000 volt, 500ma neon transformer. The bulge rings around the coil deck were the capacitors for this neckless and the some of the wiring can be seen within the right inside of the top ring. This was setup with the plasma conduit pointed up and the driver transformer hooked up directly to the primary coil to operate the main coil in transformer mode, about 500,000 volts. All of this device was created of welded polypropylene.
During a test of overall fields with a hand held 8 foot florescent tube, a wire from the neon transformer came loose and the device went into full Tesla mode and violet plasma shot up out of the plasma conduit at least 6 feet into the air near my head. Not a big spark of lightning but a real jet 2 inches in diameter. While I was trying to figure out how to get down from the device onto the concrete floor to unplug the driver, without electrocuting myself, the loose wire came off totally and the thing went dead……………………………………………………………………………………………whew.
That event damaged the built in capacitance and I was unable to repair it successfully and continue the testing of that device.
I am now cutting away the capacitance rings and turning the coil deck over to reuse it in the new configuration.
This coil will be operated at less then 300,000 volts initially.