tesla coils pat masterson ke2lj - avalonlibrary.netavalonlibrary.net/nikola_tesla/books/tesla...
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Tesla Coils
Pat Masterson KE2LJ
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Tesla history
Nicolai Tesla (b. July 9/10, 1856, Smiljan, Croatia--d. Jan. 7, 1943, New
York City), Serbian-American inventor and researcher who discovered the rotating magnetic field, the basis of most alternating-current machinery. He emigrated to the United States in 1884 and sold the patent rights to his system of alternating-current dynamos, transformers, and motors to George Westinghouse the following year. In 1891 he invented the Tesla coil, an induction coil widely used in radio technology.
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Tesla in Colorado Springs
A photograph taken in Colorado Springs during an experiment on December 31, 1899. Tesla reads a book in the background, while several million volts lightnings cascade around the laboratory. The roar that accompanied such discharges could be heard ten miles away. The photograph was obtained using trick photography. Experiment was repeated several times to capture the lightnings and then the inventor would sit on a chair to complete the picture.
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Tesla's purpose was to transmit electrical energy
through the atmosphere, and not have to use wires to
everyone's house.
Is this possible? It's very inefficient. Some modern
experimenters have tried.
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"Dr. Resonance" <[email protected]> says:
We also conducted this experiment with a large 18 inch dia. coil (8 ft.
spark at 7.5 kVA). Using an identical coil with a 30 x 7.5 inch toroid
as a receiver, with a good ground, we were able to light an 18 mm
neon tube at a distance of 4,250 ft. from the transmitting coil. Freq
was 170 KHZ. The lamp was steady brightness all along the tube.
I was quite surprised. I only expected perhaps 100-200 feet. Then
we loaded the coil on the back of an open pickup a drove away
stopping to drive a short 12 inch ground spike as we tested.
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Wardenclyffe
For his new construction project, Tesla acquired land on the cliffs of Long Island Sound. The site was called Wardenclyffe. By 1901 the Wardenclyffe project was under construction, the most challenging task being the erection of an enormous tower, rising 187 feet in the air and supporting on its top a fifty-five-ton sphere made of steel.
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Beneath the tower, a well-like shaft plunged 120 feet into the
ground. Sixteen iron pipes were driven three hundred feet
deeper so that currents could pass through them and seize
hold of the earth. "In this system that I have invented," Tesla
explained, "it is necessary for the machine to get a grip of
the earth, otherwise it cannot shake the earth. It has to have a
grip... so that the whole of this globe can quiver."
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As the tower construction slowly increased, it became evident
that more funds were sorely needed. But Morgan was not
quick to respond. Then on December 12, 1901, the world
awoke to the news that Marconi had signaled the letter "S"
across the Atlantic from Cornwall, England to Newfoundland.
Tesla, unruffled by the accomplishment, explained that the
Italian used 17 Tesla patents to accomplish the transmission.
But Morgan began to doubt Tesla. Marconi's system not only
worked, it was also inexpensive.....
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You probably know where the Tesla Lab is located already, but in
case you don't...
It is right next to the Shoreham Post Office and Shoreham Fire
House on Route 25A. It is enclosed in the Agfa (GAF) cyclone
fenced compound, and you can still recognize the old Tesla
building from the front, looking through the fence. There is a Tesla
Club in this area. They were in the process of negotiations to
purchase or receive the property for their use.
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Tesla Web Sites
http://www.teslasociety.com http://www.teslascience.org/ http://j.webring.com/hub?ring=teslaring http://www.pupman.com
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what is a tesla coil
● A two stage transformer which creates high voltage at high frequencies.
● Power levels 1 to 6 KW (or more!) ● Frequencies 100 to 500 KHz
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The 'Tesla Coil' is a device invented by the brilliant
scientist Nikola Tesla (born 1856, died1943). It is a
high voltage, high frequency, power generator,
primarily built for conducting experiments and to
observe phenomenon associated with alternating
electricity. With this coil, Tesla was able to generate
voltages of such magnitude, they would shoot out of
the apparatus as bolts of lightning!
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Although the sight of writhing streamers of electricity jumping
though the air is certainly spectacular, to Tesla it represented
energy loss. On occasion, Tesla deliberately adjusted his
equipment to produce these visible outputs as a means of
gauging the state of tune of the system, and to provide some
feedback for his experimentations
Today, Tesla Coils are built by amateurs all over the world for
one reason only, the thrill of making your very own Lightning!
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basic schematic - classic spark gap coil
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theory of operation
● HV Transformer on AC Line produces 6KV to 15 KV at 30 to 120 milliamps.
● Spark gap rich in harmonics 100 to 400 Khz ● Primary Cap and Coil make resonant circuit. ● Energy coupled into secondary ● Series resonant circuit is long coil and top hat
toroid. ● Toroid stores energy on large surface area.
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Series Resonant Circuit
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HV transformer
● NST 6KV/30; 12/30; 15/60; 15/120 ● MOT. Can stack in Parallel ● Oil Burner ● Pole Pig. Needs current ballast.
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Four MOT Stack
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Six MOTs
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12/30, 15/30, 15/60, 7.5/60
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Neon Xfmr Pole Pig
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Discarded Pole Pig!
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Primary Capacitor
● 20 – 60 KV required. (~ 3.5 applied V) ● withstand high current pulses ● Heating. Immerse in oil. ● Rapid polarity reversals. ● glass plate caps ● rolled poly with foil ● stacks of commercial caps: MMC (multi
miniature capacitor) ● Beer bottles with salt water. ● At 14.4 kV a good value would be 14 x .15 MFD 2
kV MMC ??
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Glass Plate Caps
● C = .224 eA/d pico farads
● e = 3.5 to 8 for glass
● A = 9” x 8” = 72
● d = .25 inch
● C = 245 pf = 0.245 nf
● Not much capacitance
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Beer Bottle Capacitor
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MMC Capacitor Bank
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MMC Capacitors
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Primary coil
● High circulating current. 100 Amps or more.
● flat coil, not cylinder ● 1/4 inch refrigerator tubing ● 10 Ga wire. ● various tap positions.
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Spark gap
● high current ● not too wide: .25 inch. ● needs quenching ● static: ● 2 carriage bolts ● multiple copper tube gaps with blower ● Rotary: sync or async ● triggered gap
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Synchronous Rotary Sparc Gap
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Rotary Sparc Gap
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Magnetic Quenching
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Secondary Coil
● 1000 to 1300 turns of magnet wire (24g to 32g)
● PVC coil form . 3 to 8 inch diameter. ● 6:1 width to height ● Polyurethane first. ● Use a winding jig. very tedious. ● 3 finishing coats of poly. inside and out.
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Capacitance Hat.
● A necessity ● Toroid best ● Sphere second best ● stores energy on successive cycles. ● can be too large or too small ● made from dryer duct and aluminum tape ● can buy spun aluminum toroids.
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Spun Aluminum Toroid
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Pitfalls. Watch out for:
● Series resonance with NST Secondary. Cap choice. ● GFIs in newer NSTs ● RF into NST Secondary. RC filters on both sides. ● RF hash into power lines. Use power line filter. ● power factor. correct with "run caps" on AC line. ● grounding: ● 110V AC ground ● HV center tap ● Secondary coil RF ● errant sparks. use strike rail, spacers on secondary. ● higher toroid.
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Pictures!
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Faraday Cage
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KB2IRH in the Cage
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Electrum
Project
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The End
Pat Masterson KE2LJ
Now to the Demo..