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Tesladownunder

Sun Feb 26 2006, 01:19AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Tesladownunder Feb 27 2005

Multi-layer Tesla coil
My plan is to optimise this to get the highest possible sparklength to coil length ratio.
I plan to do this by using the same wire as above but in a multi helical coil arrangement. Using a single winding of insulated wire (the PVC will hold off a much higher voltage) and a double spacer between each helix (where the wire goes from outside in to start the next helix I hope to maintain a high standoff voltage between turns plus a higher voltage between helices.

With everything under oil I hope to be able to prevent racing arcs and allow reasonably high coupling. There will be high quenching with the 1400bps ARSG and reasonable power of up to 5kVA from the 4 MOT supply. I would aim for a height of one foot for the coil with 3 inch internal diameter and ?10 inch external. I would hope for 800 turns plus. Coil DC resistance is 3.5ohms.

It will be mounted in an acrylic tube and will probably need large insulating rings to prevent surface tracking and a large insulated base to avoid primary to secondary strikes,

I will add a pic as things progress.
Performance may be reduced by the much higher distributed capacitance and breakdown internally or externally. If all else fails I have a good ballast. Any comments or suggestions to the ** Comments on Add your Tesla coil here ** thread.

Peter

Tesladownunder

Sun Feb 26 2006, 01:21AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

EDY 19 March 1 2005

Heres the newest:
6000VAC 30ma NST
flat 12 turn tuned at 10 turns primary
2.4 inch 10.5 inch long Secondary + 1.9"x7.5"
34 gauge wire (about 1000 turns)
Capbank: 54 mylar capacitors for 11340Volts, .015uf
Spark Gap- Single Static Gap
Now 10 inch arcs are obtainable to a grounded wand,
and about the same streamers to air. I replaced the torroid to a 3"x12", and placed another smaller coil on top which increased spark length some more tried everything in order to get everything i can get out of the 6000Vx30ma NST I guess this is inbetween tesla and tesla magnifier?

Tesladownunder

Sun Feb 26 2006, 01:23AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

NIK March 21 2005

This is my first coil and it goes as follows:
triple mot power suply, around 6kv at about a quarter amp
9turn priamry tapped at 6,7 or 9 (depending on the topload)
4.5in 12.75in long secondary 30gauge wire (about 1250 turns)
home made foil+plastic caps 16square feet of surface area
vacume quenched single spark gap (2 copper pipe electrodes)
top load is a 2in doorknob (best for streamers)

Arcs to ground up to 8in and streamers up to 6in. Still needs alot of work.

(photo exposure of 1sec)

Tesladownunder

Sun Feb 26 2006, 01:25AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Robert Golka April 1 2005

I will add the occasional coil that is a classic or interesting and accessible on the web.

Robert Golka's coil from 1981 which was a magnifier running 160kVA from a diesel railway engine generator (44kV and tank cap was 0.2uF). It used a car to drive a serrated sparkgap wheel.

Primary 1 turn 51 ft diam, Secondary 51 ft 26 turns, 8 feet high, magnifier coil 100 turns 8 ft high, base 12 ft high. Spark length (measured by me from photo) in excess of 32ft. (Note total height of secondary and magnifier coil is 16 feet hence total spark length to coil ratio is 2.0)

See the huge primary/secondary.

Peter

Tesladownunder

Sun Feb 26 2006, 01:37AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Robert Golka April 1 2005

In case anyone has a spare aircraft hangar and diesel engine here is the circuit diagram of Golkas coil.

A clearer picture is here.

Peter

Tesladownunder

Sun Feb 26 2006, 01:39AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Reaching April 4 2005

iÂ´ve finished my newest solid state tesla coil. it is powered by a halfbridge with two irfp460mosfets. input voltage is 230volt halfwave rectified.the driver is manual tuning.primary windings 7. secondary 11x22cm wound with 0,2mm wire. streamer lenght is about 20-30cm vttc like.

Tesladownunder

Sun Feb 26 2006, 01:42AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

John Grun April 5 2005

The $h!T C()!L
3 by 8 secondary
4 mots
50 nf cap

Tesladownunder

Sun Feb 26 2006, 01:45AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Scorper April 26 2005

Here's my friends newest project that he's been tinkering with, a dual primary SSTC.

It has two full-bridges, both of them drive a separate primary straight from rectified mains (230VAC). Current arclength is around 20" (or 50cm).

The full-bridges have IRFP460s as FETs, 4" secondary with 1400 turns and a 2x9 turn primary, Fres is around 175kHz.

The driver is a PLL, feedback taken via a CT from the secondarys ground wire, and interrupted with a adjustable frequency to get diffrent kind of streamers.

Tesladownunder

Sun Feb 26 2006, 01:58AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Scorper April 26 2005

Here it is throwing around 20" (50cm) streamers

Tesladownunder

Sun Feb 26 2006, 02:01AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Reaching May 1 2005

our newest solid state work. the coil is a 22cm 7,5cm wound with 0,2mm enammeled wire. the oscillator is a 4046pll . the halfbridge uses 2 irf740 mosfets. primary coil is 9 turns. discharges are about 15 to 20cm

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