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Tesladownunder

Sun Apr 16 2006, 05:39PM

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

Reaching Oct 16 2005

a pic of the nearly finished coil, look neat

Tesladownunder

Sun Apr 16 2006, 05:41PM

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

WilliamN Oct 22 2005

Here is my PLL SSTC I documented in the projects section. Its all together and run great. Its a halfbridge of IRF740s being driven by a version of Steve Connor's PLL driver. Halfwave rectified mains input. Mosfets stay relativley cool and can be run for long periods.

Tesladownunder

Sun Apr 16 2006, 05:43PM

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

Reaching Oct 27 2005

and a new one MINI SSTC 3

Frequency: 175khz

Primary: 14 Turns 2mm Copper wire

Secondary: 11x22 wound with 0,2mm enam. wire

Driver: Simple 555driver with adj Cap. Fullbridge of Irfp460s

Sparklenght: 35cm, up to 45cm

Tesladownunder

Sun Apr 16 2006, 05:46PM

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

Part Scavenger Nov 20 2005

Well, I finally got it looking good and I figured it was time to post it in this thread. I never would have figured all this out by myself, so thanks all you HV guys! There's not a neater site on the net. Anyway, here it is.

Right now it has a 4.13"(inside diameter), 19" tall, very thin(1/16-1/8") PVC secondary, pre-sanded and wrapped with 1200T of 27 guage wire. Secondary was coated in several coats of polyurethane. The primary consists of .5" refridgeration tubing spaced .5" center to center. Primary to secondary spacing 1". Toroid capacity 20pF in pic shown. Srike rail from a drier drum made to order! The top was already polished and the sides were already painted! Toriod corrigated drain pipe covered in aluminum foil. 6 pack MOT supply with 7th as a ballast; all under oil. Shown here is a blast gap as I have not fixed my rotary yet. See website for movie of it running. 33.2nF? of bottle caps, the more I add the better it gets.

Here is the coil, and the coil running. The bright one is 2 second exposure ballasted, the darker is 1 second unballasted. Max length so far is 49" seen in the unballasted pic. Since I'm only allowed 2 pics, the other is on my website.
Just doing my part in replenishing the ozone layer...
-Part Scavenger

Tesladownunder

Sun Apr 16 2006, 05:50PM

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

c4r0 Nov22 2005

This is my first tesla coil. I built it 4 or 5 years ago (i was then only 14 years old and more stupid than i'm now ), photos made today. The capacitors are charged by ignition coil, discharges occurs a few times per sec. Secondary height is about 30cm, the longest sparks 15cm. When i was building this tesla coil i didn't know much about how it works and i didn't do any calculation I don't know how it can work so well

Tesladownunder

Sun Apr 16 2006, 05:53PM

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

Plasmaniac Nov 27 2005

Here's my first tc. It's powered by a Flyback and has a 33nF 16kV tank cap and a 30cm secondary:

A sparkpic (note the new primary it looks much better and I dont have no more problems with primary strikes)
Helical primary: 30cm sparks, primary strikes, racing sparks
Flat primary: 25cm sparks, no problems

Tesladownunder

Sun Apr 16 2006, 05:55PM

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

Avalanche Nov 30 2005

This is my 3rd Tesla Coil, constructed in 2 days

fRes = 800Khz with (small) topload
Primary = 9T
Secondary = Approx 600-700T AWG35(?) wire (from old transformer)
Secondary Winding length = 3.5"
Driver = Steve C's PLL
Power Output stage = Fullbridge / IRF740s. Heatsinks were salvaged from an old AT PSU.
Output on 120V = 4.5" Max
Output on 230V = Around 8" before bridge died

Reliable operation on halfwave 120VDC, didn't quite survive halfwave 230VDC. It runs better with a smaller topload than the one shown in the pics below.

More photos here!
Video on 120V (500K)
Video on 230V (600K)

Tesladownunder

Sun Apr 16 2006, 06:01PM

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

WilliamN Dec 13 2005

My ISSTC. Its 74HC14 based self res controller. Interuptor is remote, conenected via shielded cable. I started and finished this coil awhile ago, I just never got around to putting the finishing touches on the the stand, etc. My DRSSTC has taken alot of my coil time, but tonight I finshed this dude up. The interuptor controls the logic section by relay. When the fire button is pushed the coil comes to life. There is also a bright blue LED syncd with the interuptor signal. Gives a cool blinky effect from deep within the coils guts. The secondary is 4.5" diameter PVC, 17" long, wound with 31 AWG wire. The primary is wound on a 6" PVC coupling. Full bridge of 24N50s (there are pics on another thread). Stand is made from MDF. Input power via 20A variac. Max spark length is 20". I am happy with this coil and dont plan on changing anything else (may be a doubler )

Here are pics of the guts, with the top section of the stand removed.
Pics of sparks with 120VAC input, about 17". With longer on times they stretch out to 20" but I like the slender ones better.
Older mockup pick with shitty torroid. Notice my DRSSTC test mule in the backround.

Tesladownunder

Sun Apr 16 2006, 06:03PM

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

... Dec 23 2005

Meet my first VTTC; brought to you by a vt-136 tube, and a voltage doubled mot...

(that's a 1.5" long bolt on top)
My setup was as follows:
this design with
main power supply: variac + voltage doubled mot
plate supply: 12v/2a wall wart (was actually running the filament at 15v)
secondary:1.5" PVC would with 4" of unknown wire (~400 turns) Fres=2MHz
topload: none or 2" stainless bolt
primary: 20 turns of 20 awg magnet wire around a 4" plastic container (random wound)
feedback coil-20 turns of 22awg hookup wire around ^ container
tube: a single vt-136 (but I have another...)
tank cap:2 30kv/.5f caps in series
grid leak cap: two 2.2nf ceramic caps in series
grid leak resistor: 60k/20w worth of sandstone resistors
grid bios resistor: (the vt-136 is a tetrode) 60k/40w worth of sandstone resistors

It still needs more tuning and better coils, but it works!

Tesladownunder

Sun Apr 16 2006, 06:07PM

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

Tesladownunder Jan 13 2006

Here is my TC made up for the Physics Dept at the Uni of Western Australia. I tried to incorporate the historical aspects of their 40 year old coil (see page 6, post 152 in this thread).
I really wasn't able to get much performance out of the the old setup so I have used the wooden bases and antique terminals in a hybrid acrylic/antique setup. The coil is conventional and was intended to be powered by one or two 12kV 30mA NST's but they found an 11kV 110mA NST in storage. Secondary is only 840 turns. Caps are standard CD .15uF, Two strings of 15 and the gap is a static 5 gap copper tube array.
Sparks are 25 inches but it does need to be contained in a Faraday cage for public safety. I have also made it on a large aluminium sheet counterpoise to allow operation in a non earthed environment.
It is still in progress and needs a fan, strike ring and upgraded Terry filter.

Peter

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