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Forums
4hv.org :: Forums :: Tesla Coils
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** Add your Tesla coil here **

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Tesladownunder
Sun Feb 26 2006, 02:02AM
Tesladownunder 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.


1140919363 10 FT14 Ganz21
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Tesladownunder
Sun Feb 26 2006, 02:03AM
Tesladownunder Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
cTc-Basti May 2 2005

Some nice sparks...


1140919416 10 FT14 Foto 14 1
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Tesladownunder
Sun Feb 26 2006, 02:05AM
Tesladownunder 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


1140919530 10 FT14 Teslacoil0111

1140919530 10 FT14 Teslacoil0131
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Tesladownunder
Sun Feb 26 2006, 02:07AM
Tesladownunder 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


1140919648 10 FT14 100 13641
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Tesladownunder
Sun Feb 26 2006, 02:10AM
Tesladownunder 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.

Peter


1140919800 10 FT14 Vttcsmallsecrunning475a1
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Tesladownunder
Sun Feb 26 2006, 02:12AM
Tesladownunder Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Tesladownunder May 6 2005

A slightly improved version demonstrating the sword like character of high frequency VTTC or SSTC sparks. Sparks still only 4 inches at this stage.

Peter


1140919925 10 FT14 Vttcvodka475a1
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Tesladownunder
Mon Mar 27 2006, 12:34AM
Tesladownunder 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

1143419655 10 FT14 Teslafirstoriginalpic475
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Tesladownunder
Mon Mar 27 2006, 12:35AM
Tesladownunder 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.

Peter
1143419730 10 FT14 Teslafirstreconstruction4751
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Tesladownunder
Mon Mar 27 2006, 12:36AM
Tesladownunder 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.
1143419805 10 FT14 Teslatwofoot1
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Tesladownunder
Mon Mar 27 2006, 12:37AM
Tesladownunder Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Boshi May 16 2005

Got my first one working decently.

12KV neon sign transformer
20 nF / 30KV MMC
21" long, 3.5" diameter secondary
about 6 turn primary

1143419869 10 FT14 P10100431
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