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4hv.org :: Forums :: Tesla Coils
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DRSSTC project From Italy

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JoeBonanno
Thu Jun 06 2013, 01:00PM Print
JoeBonanno Registered Member #14660 Joined: Mon Apr 22 2013, 04:05PM
Location: Sicily, Italy
Posts: 19
Hi to all!

i'm Joe, writing from Italy.

From few weeks i'm planning to build a DRSSTC. Is the fist time for me around Solid State. i had build a lot of classic Spark Gap TC and Vacuum Tubes TC, using from little PL519 tube, to Big GU81M!

i decided to walk through the Solid State Universe after have watching some interesting videos on YouTube. it's incredible the capabilities of SSTC compared to an Classical spark gap Tesla!

So, i started to browse some website and acquires all the info that i need. At this time this is the state of the project:

Studying over and realization of Steve Ward UD (Eric Goodchild 2.5 Relase)

Dsc0823l

(tested and run Great!!)

Interrupter, classical BPS-PW and Burst Mode (Custom PCB)

Dsc0824ag

(Tested, soon with Tosling Optic Fiber Transmitter!)

OCD and FB-CT 1:1000

Dsc0821w

(soon Gate Transf. and measure Transf.)

2X 6000uF 400V Capacitor

Dsc0827lc


2 different type of large IGBT, Semitrans SKM300GB12T4 and 403GB128D

Dsc0825me

( i'm planing to use the first ones, but i accept suggestion!)


I have also 25AWG (0.45mm) wire for the secondary, i calculated winding for obtain about 40Khz Toploaded!

it's all for the moment!
thanks for comprehension for my bad english and i accept all critics or suggestions!

Joe!
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HV Enthusiast
Thu Jun 06 2013, 01:55PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Very nice work! Thanks for sharing the photos. I love seeing what others are doing in the DRSSTC world on the other side of the pond! Keep up the good work!
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Physics Junkie
Thu Jun 06 2013, 05:19PM
Physics Junkie Registered Member #7267 Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Cool! Everything looks good. No inductor on the UD, so you are not going to be using phase lead? (or was that just for testing purposes?) Just make sure to keep all your BUS and bridge connections tight and short to maintain lowest possible inductance.

Mind if I ask, what are the dimensions going to be for your secondary and topload?
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JoeBonanno
Thu Jun 06 2013, 06:08PM
JoeBonanno Registered Member #14660 Joined: Mon Apr 22 2013, 04:05PM
Location: Sicily, Italy
Posts: 19
Yes, i planing to use Phase Lead but i have some problem to find variable inductors in Italy at the moment. but i will use it! actually just for testing purposes!!

Yes, short connection for lowest BUS inductance!! short as i can! For this reason i think to use SKM300GB12T4, its seems to be easier for short connection. and a little more fast and powerfull!!

I'm here for have suggestion and help, so.....sure.... i planing to use 250mm Diameter and 1000mm Eight using 0,45mm (25AWG) wire. My software say:

- 70,90khz of resonant f.
- 42,97khz of quarter wavelength
- 31,78pF Toroid capacitance required

its correct?
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Physics Junkie
Thu Jun 06 2013, 07:17PM
Physics Junkie Registered Member #7267 Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Yeah that's all correct. I tried deepfriedneon.com with the dimensions and got 41kHz. So its right on target.
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HV Enthusiast
Fri Jun 07 2013, 12:41AM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
JoeBonanno wrote ...

Yes, i planing to use Phase Lead but i have some problem to find variable inductors in Italy at the moment. but i will use it! actually just for testing purposes!!

Yes, short connection for lowest BUS inductance!! short as i can! For this reason i think to use SKM300GB12T4, its seems to be easier for short connection. and a little more fast and powerfull!!

I'm here for have suggestion and help, so.....sure.... i planing to use 250mm Diameter and 1000mm Eight using 0,45mm (25AWG) wire. My software say:

- 70,90khz of resonant f.
- 42,97khz of quarter wavelength
- 31,78pF Toroid capacitance required

its correct?


If you're willing to pay just the postage, i'll send you some variable inductors.
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JoeBonanno
Fri Jun 07 2013, 10:38AM
JoeBonanno Registered Member #14660 Joined: Mon Apr 22 2013, 04:05PM
Location: Sicily, Italy
Posts: 19
Really "EasternVoltageResearch" ?? thanks!!!

how can i send you the necessary money?





@Physics Junkie: very cool website, full of information and guideline! i usually use "Tesla Coil CAD" and "Tesla Map" (Google helps!!)

but,actually i have a doubt! i have bought 0,45mm wire double isolation and the final spessore is 0,50mm. Making calculation i have to consider 0,05mm of turns spacing, right?? final Freq. can change!!

And, how can i calculate the dimension and capacitance of this kind of toroid? Toroid

i have to consider it like a single solid toroid (classical way) or multi mini toroid parallel?

Thanks!
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Steve Conner
Fri Jun 07 2013, 11:18AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I like the 128 series bricks! :)

I believe the skeleton toroid has almost the same capacitance as a solid toroid.
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HV Enthusiast
Fri Jun 07 2013, 02:08PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
wrote ...

Really "EasternVoltageResearch" ?? thanks!!!

how can i send you the necessary money?

Just contact me via PM and send me your mailing address.
If the shipping is under a few bucks, don't worry a bout it. I'll send you the inductors and some free stickers.

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Physics Junkie
Fri Jun 07 2013, 04:58PM
Physics Junkie Registered Member #7267 Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
JoeBonanno wrote ...


@Physics Junkie: very cool website, full of information and guideline! i usually use "Tesla Coil CAD" and "Tesla Map" (Google helps!!)

but,actually i have a doubt! i have bought 0,45mm wire double isolation and the final spessore is 0,50mm. Making calculation i have to consider 0,05mm of turns spacing, right?? final Freq. can change!!

And, how can i calculate the dimension and capacitance of this kind of toroid? Toroid

i have to consider it like a single solid toroid (classical way) or multi mini toroid parallel?

Thanks!

I would trust the TeslaCAD and Teslamap to be more accurate , JavaTC is another good one. I've always used 0 for the spacing between turns, but doing it your way might be more accurate. I find it to be negligable, only ever making a difference of one or two kHz. I know that JavaTC usually takes this into account anyways, showing spacing between turns to be something like 0.0008 inches. The best way to find your secondary +top load frequency is with an oscilloscope and function generator.
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