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Tesladownunder

Sun Feb 26 2006, 12:59AM

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

Pvt. Sparky Dec 25 2004

...and here are the guts. In case you are wondering about the extreamly loose coupling in the first picture; It was discovered that the tube kept dropping out of oscillation and going into thermal runaway when I had tighter coupling. I couldn't figure out what was going on, and figured that it must be oscillating at some other wierd frequency when it did that. Parasitic supressers didn't help. the only fix was to reduce the coupling. VTTCs can do some strange things when the mood strikes them!

Tesladownunder

Sun Feb 26 2006, 01:01AM

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

Tesladownunder Jan 7 2005

SIDAC spark gap substitute.
This is a proof of principle coil rather than a big performer. It uses SIDAC's in place of a spark gap (As I use them which is with the tank cap across the supply rather than the spark gap across the supply). These are symmetrical breakdown devices

As set up at present it is driven by a MOT transformer with the associated 11kV diode and 0.95uF capacitor in a voltage doubler arrangement to provide 5.8kV or so. This is dumped by a SIDAC or rather 22 in series each shunted by 1 megOhm. Each SIDAC is rated to breakdown at 240V and has a 1A RMS or 130A 10uS pulse capacity. The string of 22 SIDAC's will nominally breakdown at 5280V. SIDAC's act similarly to a sparkgap.

The SIDAC's cost US$1.33 each in 10 quantity at Digikey.

Also shown running ignition coils (with much better performance) here:

This might have application for small coils running low voltages where spark gaps become problematic, but without the complexity of an SSTC.

Is this therefore a SIDAC spark substitute solid state Tesla coil. (SSSSSTC)?

Pic shows 2 inch sparks on my 4 inch coil (5 kV in 60kV out). I later used 47 SIDAC's each shunted with 1M :uomega:. I could get small streamers but not much more regular spark length. If I used a spark gap in series with the SIDAC's the spark length increase was marked and over 6 inches. I interpret this to indicate that quenching is not really happening with the SIDAC's alone. I had hoped the SIDAC's recovery when the current drops would do this but apparently not well enough.

Tesladownunder

Sun Feb 26 2006, 01:02AM

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

Reaching Jan 26 2005

hello. this is my newest spark gap tesla coil. it is powered by a 6kV 120mA nst.the caps are two high voltage capacitors in series ,each ratet with 50nF @ 16kV .it seems to me, that the performance of the coil is very good. output is 60 to 80cm (24"- 32") the coilform is an 4,4" x 18" pp , wired with 900turns of 0,5mm enameled wire. the primary is 6 turns of mercury string. the topload is a little bit to small, i know. it was made from a aluflex pipe. the size is 10cm x 30 in diameter.

Tesladownunder

Sun Feb 26 2006, 01:04AM

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

Reaching Jan 26 2005

here is the earlyer version of that coil. it has a smaller secondary and a primary on a wooden plate. wood isnt good for teslacoils .a spark hit the wood and burned it.

Tesladownunder

Sun Feb 26 2006, 01:09AM

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

Dit Bestand Jan 26 2005

Hello,

this is my second tesla coil it's performing quite well (does anybody know what the maxium spark length is with a 350 watt power supply?)

specs:
Power nst 8kv 50 mA (yeah i know it's an 400 watt nst but my filter dispens 50 watt in heat in the resistors )
33nf MMC.
8 turn primary
1000 turn secondary
2 toroids 10 x 40 cm and 12.5 x 50 cm
spark length 1.05 meter
Single static gap blown by a vaccum cleaner.

here is a picture of my coil arcing 1 meter

Tesladownunder

Sun Feb 26 2006, 01:11AM

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

Reaching Jan 27 2005

this was our ballcoil . it has no rf grounding. the ground of the secondary goes directly in the primary coil. i dont know if this was very healthy the whole setup were build on a 16cm x 25cm wooden plate. the weight was only about 4lbs (2kg)..

Tesladownunder

Sun Feb 26 2006, 01:13AM

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

Hammertone Jan 31 2005

Some of you will remember the coil I showed in the 3-D modelling thread.
Here it is in real life...

Cheers, Finn Hammer

Tesladownunder

Sun Feb 26 2006, 01:15AM

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

Syd Klinge Feb 1 2005

Syd Klinge's "Cauac"
The Big Day Out is a rock concert that tours major Australian cities with over 40 local and international bands. The inducement for me to travel 3000Km to see it was one of the side attractions, Syd Klinge's 'Cauac' 16 foot coil running at 100KVA. I was fortunate enough to meet the charismatic Syd and his entourage to talk coiling and see it run. It runs from a portable generator rated at ?170 KVA 3 phase ?480V using if I recall correctly one 11 KV pig for each of the 3 phases each individually ballasted. The output is rectified using over 1000 1N4007's to DC then through an RF filter to the base of the coil and the spark gap which is ARSG using 1/2 inch tungsten electrodes. Tank cap was two 0.1 uF custom made units. Resonant frequency is 59 kHz. The secondary is 10 feet tall and 16 feet total height. The winding is crosslinked PVC coated. Toroid is chicken wire covered.
Further pics on my site
If Syd joins 4HV he may be able to give better pics and details.
Three days after this pleasant day, Melbourne had 5 inches of rain in one day which was an all time one day record.

Tesladownunder

Sun Feb 26 2006, 01:16AM

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

Syd Klinge Feb 1 2005

The "piggery". Only the 3 smaller pigs are in use. Air-gapped ballast inductors on each 3 phase line.

Peter

Tesladownunder

Sun Feb 26 2006, 01:18AM

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

Tesladownunder Feb 23 2005

Multi-layer Tesla coil
Yes this is a spark gap driven air cored resonant transformer, ie Tesla coil. This is a 500 meter roll of 2.5mm multicore electrical wire. It is probably about 1000 turns, ie similar to my current 4 inch coil. It has been placed on top of my primary and is resonant at 38kHz with the 90nF MMC tank cap. No real attempt to tune or to optimise coupling.

Shown here with 3 inch sparks and a lot of inter turn corona and breakdown.

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