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Tesladownunder

Sun Apr 16 2006, 01:07PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

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

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:08PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Tesladownunder Jan 13 2006

..... and the Physics Dept coil in action. The gap looks quite interesting through the red acrylic, and very like a stereo LED equaliser array as the sparks jump around.
I must say they weren't entirely happy with the upgrade as it was no longer safe to draw sparks onto the demonstrators hand

Peter

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:23PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Reaching Jan 21 2006

i proudly present my newest DRSSTC work,

DRSSTC 3 4

Driver: Dual 74hc14 buffer zero current switching, overcurrent protection, 2 pairs of ucc drivers, secondary feedback.

Bridge:H-Bridge of 4x hgtg30n60a4d 8,8yF decoupling, dual GDT, 2700yF smoothing cap @309Volt DC

Primary9 Turns 3,5mm massive copper wire with an diameter of 16cm. Gap between each Turn 1cm

Secondary:11x32cm wound with 0,2mm Wire, 10x30cm Toroid, Resonant Frequency at 123kHz

mmc: 165nF at 6,4kV consists of 12 Wima MKP10 0,22 1600V 3 strins of 4 in series, each cap paralelled with 1m ohm resistor.

sparklenght, nearly 90cm ´

the complete coil is made out of 6 and 8mm thick HDPE sheets . I constructed everything as professional as possible. It took nearly 3 weeks to build. Everything is new on this coil, Bridge,Driver,Interrupter etc. The Driver is a Prototype made for my huge DRSSTC2 Projekt . I thought it had to be tested before i build it in my drsstc2

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:31PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Blackplasma Jan 24 2006

Here's my piny lil solid-state coil with puny lil sparks... about 800kHz

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:34PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

blackplasma Jan 24 2006

Can't help myself - before it all dies, here's another shot:

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:36PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

... Feb 1 2006

This is my newest coil, based on a pair of 811a's...
The secondary is 8" tall, 2.7" in diameter would with 32awg wire
The primary is ~15 turns of 22awg double insulated wire, the feedback is 18 turns of the same stuff about 1" above it.
It has a .6nf tank cap, 2.2nf grid leak cap, and a 4k grid leak resistor. I also found that I had to put a 4k wire wound resistor in between the feedback coil and the grid leak network to prevent the tube from arking from grid/filament where they pass into the tube (atmosphere side of metal/glass seal)
The power supply is a voltage doubled mot+varic (turned all of the way up for this pic)

Sparks were about 5", and didn't look all that much better than the ones from my 2.5"/5" secondary vttc, so I am using it now.

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:38PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

EDY19 Feb 1 2006

Here it is, I reposted it because the pictures were 12 inches out of date Based off a 74HC14, antenna feedback. 7 primary turns, with resonant frequency w/o topload of 179Khz. Sparks have reached 16 inches to a grounded target, with sparks to air commonly around 13-14 inches. Topload is overly large, but thats what works best. Secondary is 4.5 inches by 8.5 inches wound with 35ga wire, so 14 inch sparks w/o DRSSTC toplogy seems pretty good. It is run off steves SSTC2 intterupter.

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:40PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

... Feb 1 2006

I got this little vttc (secondary is 5" tall as 2.7" in diameter) working about a week ago, but have been waiting to post it until I got it looking decent... I havn't made the box for all of the stuff to make the vttc work, but I have got the coils looking half decent so I will post them now and if I finish the box for the rest of the stuff (transformer, tube, resistors and caps) before this forum closes I will add it in.

The details are as follow:
HV supply: line filter -> mot out of a 1.2kw microwave oven ->150ohm/8w mmr (multi-miniature-resistor )
LV supply: 120v to 12.6vct 50va filament transformer
Tube: single 811a
secondary: 5" tall and 2.7" in diameter would with 32awg wire on a pvc form
primary: 12 turns of 22awg double insulated pvc wire on a 4" pvc form
feedback coil: 18 turns of 22awg double insulated wire on the same 4" form
grid leak network: 2.2nf cap and 4k wire wound resistor, with another 4k wire wound resistor in series with it (without it the tube arked over at the atmosphere side of the glass/metal seal
tank cap- 0.65nf 30kv doorknob cap
topload- a 2.5" fender washer with a 1/4-20 ss caphead bolt that I ground down to a point
(using a drill/file) sticking through it. On top of that there is a 1/4-20 nut that I made round and another washer stacked on top of it (heat sinks the bolt and gives hotter sparks)

Sparks are about 3" long, quite hot, graceful looking, and quiet; only a faint (very noticeable, but quiet enough for you to sit next to it for extended periods of time without being annoyed) 60hz buz There is almost no e-field emitted regardless of streamer output, it will only light up fluorescent lights for like 3" at most.

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:41PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

... Feb 1 2006

I don't know how I forgot to add my second coil of all time. It was preceded only by a micro sgtc that I built using 32awg wire on a 3" tall by 3/8" wife form using a 4 22pf 3kv ceramic caps in series, a spark gap consisting of 2 wood screws screwd into a piece of 1/2" pvc pipe, and a power supply of a 30kv hfac module from a plasmaglobe (~20w power out) half-wave rectified with a string uf sf1600 diodes, giving sparks almost 1/2" long, bt since I don't have any pics I wont post it...
In any case, this coil cnsists of:
secondary: 5" tall and 2.7" in diameter (I really like that size secondary) wound with 32awg wire.
primary: 10turn flat primary made out of 14awg copper wire tied/glued down to some lexan taped at 4 turns
tank cap: 10 .015uf 2kv caps in series (942C20S15K's)
power suppy: 7.5kv/30ma nst that I added the line filter from an atx power supply to (in reverse)
spark gap: this has gone through many revisions, currently it is 2 steel (bad) 1/2" nuts superglued to a few pieces of acrylic with 1/2" steel roundhead bolts wound in them.
topload: 2" funnoodle covered in packing tape then Al foil (really leaky)
spark length: about 5" strikes (primary strikes) could be way longer with a better topload

here is a pic of the sparks from the topload, about 4" long

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:42PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 2 2006

Half bridge DRSSTC made with two BUP307 IGBTs
Antenna feedback driver
4.32 inches diam secondary, D/L =1/ 4.8, 2665 turns
res freq with toroid = 101 kHz
8 turns cilindrical primary
298 @ 13 kV primary cap
20 inches discharges
More information at:

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:44PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 2 2006

Full bridge DRSSTC made with BUP314 IGBTs
Antenna feedback driver
4.32 inches diameter secondary, D/L = 1/4,8 , 2665 turns
resonant freq with a bigger toroid = 96.5 kHz
6 turns low coupled primary
300 nF @ 12 k primary cap
up to 40 inches streamers with 30 V on the IGBT gates

More information here:

See the "Step four"

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:46PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 3 2006

Dual MOT SGTC
Two MOT with seried secondaries, primarries in parallel, current limited with two ballast coils.
4.32 inches diam secondary, 966 turns
little toroid
7 turns primary, taped at 6 turns
25 nF @12.8 kV primary cap, MMC style
22 inches discharges.

Now updated to 35 nF primary cap, 5 turns primary, dual static spark gap, 25 inches streamers

More information:

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:48PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 3 2006

Mini DRSSTC with a half bridge made with BUP307 IGBTs (1200 V @ 35 A)
Antenna feedback driver
4.32 inches diam secondary, 1325 turns
res freq with toroid = 157 kHz
3 turns primary
250 nF primary cap
22 inches streamers

More information:

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:49PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 3 2006

Ignition coil powered SGTC
1.5 inches diam secondary, 800 turns
ball topload
6-7 turns primary coil
3.6 nF primary cap
Dimmer cap driver for ignition coil
6 inches ground discharges

More information:

The final setup is at "Step four"

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:51PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 03 2006

OBIT powered SGTC
9500 V @ 23 mA OBIT
1.96 inches diam secondary, D/L = 1/4.7 , 1175 turns
little toroid
res freq = around 400 kHz
10 turns flat primary, taped at 9 turns
6.66 nF @ 24 kV MMC primary cap
up to 20 inches with a multiple spark gap

More information:

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:53PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 3 2006

Oudin coil
Big 14 cm diameter coil with 90 turns
470 nF @ 30 kV ceramic primary caps
res freq = around 2 MHz
Nice plasma display in light bulbs

More information at:

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:54PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 3 2006

Flyback powered mini SGTC
AC flyback rectifyed, driven by a ZVS driver
1.96 inches diameter secondary, 1075 turns
ball topload
6-7 turns primary
3.6 nF primary cap
simple static gap
For specific current seting, the output is a single waving streamer

More information:

Final setup at "Step nine"

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 01:56PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

Vasil Feb 3 2006

Single flyback powered SGTC
Using a single DC flyback and a big SGTC system at low bang rate, up to 90 cm ground discharges can be achieved.

More information:

Look at "Steps 12-14"

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Tesladownunder

Sun Apr 16 2006, 02:03PM

Joined: Thu Feb 02 2006, 03:45AM
Location: Bunbury, Australia
Posts: 1346

************************************************** ***********************
Tesladownunder Feb 11 2006

Well, after 23,000 hits this is the last post before everyone heads off to the new brighter 4HV around Feb 10th 2006.

Peter

------------------------------------ -------------------------------------------------- ------------

Now follows new entries since the start of the current 4HV.org

(don't forget the posting rules which are slightly changed since a post can contain 2 photos)

The 3 Rules to keep it consistent and readable:
Each coil to have only 1 page of info (ie fits on your computer screen). Brief is best.
Each coil to have only 2 photos (do not double post for the second photo).
Only coil details and photos to be posted. Direct any queries direct to the person or in a new thread.

A coil is defined by its secondary (change of toroid isn't a new coil)
Enter as many coils as you wish. Beginners coils are welcome and this log is designed to be helpful for beginners.

Peter

..... "Power tends to corrupt, and absolute power corrupts absolutely." Lord Acton, 1887.
...................... See absolute corruption at

Extreme Electronics

Sun Apr 16 2006, 04:36PM

Registered Member #74
Joined: Thu Feb 09 2006, 03:17AM
Location: Nottingham UK
Posts: 93

Sprite, a small DRSSTC

Topload 153mm x 38mm toroid
Secondary 900T of 0.125mm on 127mm tall x40mm diameter
Primary 6T 1mm copper
Primary Cap 22nF @3KV (4x47nF @1.5Kv in series parallel)
IGBTS 2 x 4PH30KD Half bridge
Fres 500Khz Approx
Output 10" arc to ground.

More information

Congratulations to Peter for doing a sterling job of replacing the coils on this thread...

Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality. - Nikola Tesla

Tesla coils 'n' HV stuff
Funny Stuff

Bennem

Mon Apr 17 2006, 03:40AM

Registered Member #154
Joined: Sun Feb 12 2006, 10:28AM
Location: Westmidlands, UK
Posts: 229

My second DRSSTC,
8 inchx3.5inch secondary wound with 36AWG,
Full bridge of HGT1N40N60A4D igbt's,
75nf res capacitor,
4x 470uf storage caps with 2x10uf on the igbt's.
Steve Wards driver circuit with OCD, primary feedback,
Primary is tapped at 4.5 turns.
total height is 17.5 inches.

Women want it all, with the possible exception of cellulite - Jeff Green

JimG

Tue Apr 18 2006, 12:08AM

Registered Member #52
Joined: Wed Feb 08 2006, 10:22PM
Location: Austin TX
Posts: 57

This is my first DRSSTC. It was built over a couple of weeks in July 2005.
It was wound on a 15"x4.25" secondary with a 13"x4" topload.
Primary capacitance of 186nf.
It uses a full bridge of 40n60s, has a direct feedback driver with soft switching, overcurrent protection, adjustable deadtime, and a fiber optic driven interrupter.

Terry Fritz

Tue Apr 18 2006, 11:01PM

Registered Member #393
Joined: Mon Apr 17 2006, 07:30PM
Location: Fort Collins, Colorado, USA
Posts: 276

Hi,

Sort of a "test post for newbee me here"...

Here is the "first" OLTC

Cheers,

Terry

Cesiumsponge

Wed Apr 19 2006, 08:23PM

Registered Member #397
Joined: Tue Apr 18 2006, 07:56PM
Location: Western Washington
Posts: 125

An old picture of my VTTC and some less commonly seen streamers. I can't believe they're almost 3 years old. Hasn't been fired for at least 2 years, doh! I'll have to get back into this stuff.

mod edit: Whoa, that last picture is a bit too wide! Welcome back Eric!

How many pancakes fit in a doghouse? None, because ice cream doesn't have bones.

williamn

Wed Apr 19 2006, 11:11PM

Registered Member #55
Joined: Wed Feb 08 2006, 10:56PM
Location:
Posts: 149

Here is my small DRSSTC: 3.5"x9" secondary form. 32AWG magnet wire. Two 1500uf 250VDC caps with two diodes form the voltage doubler. Halfbridge of 30N60A4D. Primary current feedback with OCD as well. Maximum length discharge is about 20". This coil has provided many hours of runtime and has now been retired. I used it as a test bed and am working on Minime2 using what I learned on this one.

Video of coil running http://www.texaslightning.4hv.org/mini_me_drsstc2.wmv

Avalanche

Thu May 25 2006, 07:48PM

Registered Member #103
Joined: Thu Feb 09 2006, 02:16PM
Location: Derby, UK
Posts: 641

It's about time my latest coil had a place in this thread.

This is my coil, nicknamed 'Triangular Cellulation'. Don't ask why!

Anyway it runs at well over 1Mhz, due to the rather heavy gauge wire on the secondary. It is PLL driven, and has a halfbridge of IRFP460s for the power output stage. Max output currently is just under under 4" to air, with 110V into the halfbridge. Haven't tried it directly on the mains yet.

The secondary coil is about 2" diameter, just to give you an idea on the size of this thing. It isn't tiny, but it is a rather small coil. Quite a nice size really!

Future plans - Add an interrupter, and make it into a DRSSTC.

Check out the video also: Here, 2.2MB MPEG1

"I've lost track of where all the different burning smells are coming from..."
"Is the water off? I need to cut this hose" ... "That's not a hose you idiot, that's the 3-phase!"

Avalanche

Sat May 27 2006, 09:05AM

Registered Member #103
Joined: Thu Feb 09 2006, 02:16PM
Location: Derby, UK
Posts: 641

My mini spark gap coil

This is the first spark gap coil I have constructed. It's powered by a monitor flyback, using the ZVS circuit. At 24 volts in to the ZVS, I am getting about 3" maximum streamers.

Uses a tank cap of approx 4nF, 4 beer bottle caps. The spark gap is made of 3 brass nuts.

Video: 2.8MB MPEG1

Edit: The coil now has a webpage on my site (see sig)

"I've lost track of where all the different burning smells are coming from..."
"Is the water off? I need to cut this hose" ... "That's not a hose you idiot, that's the 3-phase!"

McFluffin

Wed May 31 2006, 10:10PM

Registered Member #119
Joined: Fri Feb 10 2006, 12:26AM
Location: USA
Posts: 93

I've had my avatar my rotary spark gap since the old 4hv, yet I never posted my TC since I never tried turning it on until a bit ago. I have a home made capacitor that seems to be not holding a charge, but heres a pic of the coil anyway. 10.5kV Franceformer @ 30mA.

So much to do, so little time

Steve Ward

Sat Jun 17 2006, 02:58PM

Registered Member #146
Joined: Sat Feb 11 2006, 10:21PM
Location: Streamwood, IL.
Posts: 907

A big high power SSTC. Produces 18" sparks (so far) in CW mode, and 33" sparks in full-wave rectified mode (no filtering). Its a power hog, pulling up to 30A on the 240V line. Uses a bridge of IXFN80N50 MOSFETs, which never get more than a few degrees above ambient. The primary and secondary are from my magnifier experiments (secondary is 12.75"x20" with .035" diameter wire). The driver is a rip-off of Steve Conners PLL driver that i built 2 years ago. All the parts were already on-hand except the base which i put together in an hour or so, so this coil was built in just a day (it was mostly wiring and tuning). Its interesting to note that the TC load is a constant current sink. Once about a 3" breakout is achieved, the primary current is fixed from then on (typically 24Apk in CW mode, and 50Apk in unfiltered mode because i reduce the primary from 10 turns to 5 turns). So bridge dissipation is pretty much the same at 15% input as it is at 100% input (only switching losses increase). Check out the pictures and videos here:

Reaching

Wed Jul 12 2006, 02:09PM

Registered Member #76
Joined: Thu Feb 09 2006, 04:04AM
Location: Hemer, Germany
Posts: 440

Here is my new drsstc6

Primary: 7 Turns of 1/4" copper tubing with an diameter of 10"
Secondary: 6"x19" wound with 0,3mm
Toroid: 4"x16" alu ducting pipe smoothed and covered with alutape
MMC: 220nF 8kV
Bridge: Fullbridge of 40n60s running at 310V dc
Longest streamer so far: 48"

The drsstc6 is my first primary feedback drsstc. the driver has a onboard overcurrent detection set to 550A. interrupter input is around 200bps and 120yS on Time

Visit my new Website

, in German but soon in English

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Moderators: Chris Russell, Noelle, kalenedrael, Alex, Grant, Tesladownunder, ShawnHV, EastVoltResearch, Dave Marshall, Ben, Bjørn, Matt, Dave Billington, WaveRider, Steve McConner, Anders M., Simon, Tim Koene