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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
cTc-Basti May 2 2005
This is my first SSTC. The driver and the half-bridge are nearly the same Reaching used for his coil. It has got some more primary turns, so the two IRFP460 will live a bit longer.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
StarWarsFanatic May 6 2005
This is my first tesla coil. SPECS: Power Supply: 12,000v 30ma nst (franceformer) Secondary: 3/4" wide 3" long, about 400 turns of some wire I found on the side of the road. Primary: 4 turn pancake Capacitor: 1 pepsi bottle filled with saltwater and oil,wrapped with foil Total time spent:about 3 hours
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Tom May 6 2005
Yeah here's my little coil. It's making about 15 inch sparks to grounded objects Some specs: 9kV, 30mA transformer CDE 942 caps, 12.5nf, 8 caps in series Secondary coils is 2.35" by 13", uses 28AWG, which is 945 turns in total toroid is 3" by 8.5", so it's about 8.35pF
oh yeah for some reason the table itself is a tad uneven (not the coil's cabinet) and it really shows by looking at the secondary coil
anyway this is my first coil I build it a while ago
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Tesladownunder May 14 2005
VTTC This is my vacuum tube (valve) Tesla coil. I am using a Philips TB3/750 power triode rated at 3 kV 1 kW with a 5 V 14 A filament. The high voltage comes from a microwave oven transformer (MOT) and doubler. The filament supply is from a rewound microwave oven transformer to give the 5 V. This is largely a copy of Steve Ward's VTTC modified to use parts I had on hand. Primary is 27 turns, tapped on the last 10, feedback is around 22 turns, secondary most recently is 750 turns of 26G on 12 inches 3 1/2 inch PVC. Power is a voltage doubled MOT. Not really tuned yet and a number of modifications are needed.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Tesladownunder May 14 2005
My 1972 'accidental' Tesla coil - a reconstruction My first TC was 'discovered' while running a spark spectroscopy project at home in 1972. This used about 10 kV from multivibrator excited dual ignition coils with a capacitor across them and then damped with 10 turns of an air cored radio coil. The other end of the 130 turn coil developed a corona visible in the dark spectroscopy room. It was a truly amazing sight.
Somewhat remarkably, this was an inadvertent Tesla coil complete with spark gap, tank cap and air-cored coil AND it worked unintentionally.
This is a picture of the original high voltage setup with the spectroscope shown open and the HV diode, air cored coil and cap made of 6 x 0.0033uF 3kV ceramics in series to give 550pF. The spark gap with clips to hold the metal being examined spectroscopically is also shown. Peter
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Tesladownunder May 14 2005
My 1972 'accidental' Tesla coil - a reconstruction This is a reconstruction which took about an hour to make. It uses the same size cardboard former as the old one 45x100mm which had to be reinforced with PVC. (Toilet rolls are not as strong in 2005 as 1972 ) The wire gauge is 0.40mm (prev 0.6mm) and is wound to 130 turns with multiple taps between 10 and 20 turns. The caps were 6 x 0.01 3KV = 1600pF (prev 550pF) and power supply was my SIDAC driven twin ignition coil setup. Spark gap was about 2mm as anything higher gave racing arcs! It is not tuned due to the different caps and smaller wire gauge. Primary arcing was taking place from the tap points but in the original the first tap at 10 turns was the one I used.
Spark length was only 1cm but corona was visible with dark adapted vision.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
kv May 15 2005
This is my 2MOT coil. I don't like to complicate things so this coil is about as simple as it gets. Two MOTs ballasted by a 70 amp arc welder in series and run off a 120volt 15amp circuit without any trouble. Tank cap is 75nf mmc style and the gap is the inside-out sucker gap quenched by a 3.5hp shop vac, which just barely does the job. Primary is 3/8 copper pipe tapped at 2.5 turns and primary wiring is three 12awg stranded wires for each connection, which still gets hot. Topload is an 8 inch lighting globe covered in aluminum tape. Secondary is around 800 turns of 23awg wire. Sparks in the photo are about two feet, but frequent. Longest confirmed spark was three feet to a grounded rod.
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