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LAN_403

Tesladownunder

Sun Apr 16 2006, 06:08PM

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

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

1145210935 10 FT14 Teslaphysics110macageon4751

Tesladownunder

Sun Apr 16 2006, 06:23PM

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

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 Â´

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

Tesladownunder

Sun Apr 16 2006, 06:31PM

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

Blackplasma Jan 24 2006

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

Tesladownunder

Sun Apr 16 2006, 06:34PM

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

blackplasma Jan 24 2006

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

Tesladownunder

Sun Apr 16 2006, 06:36PM

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

... 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.

Tesladownunder

Sun Apr 16 2006, 06:38PM

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

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.

1145212682 10 FT14 Copy Of Sstcbigtoroid1

Tesladownunder

Sun Apr 16 2006, 06:40PM

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

... 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.

Tesladownunder

Sun Apr 16 2006, 06:41PM

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

... 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

Tesladownunder

Sun Apr 16 2006, 06:42PM

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

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:

Tesladownunder

Sun Apr 16 2006, 06:44PM

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

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"

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