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1
The winding method with a network cable that is described, is how I did in on my first DRSSTC: https://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/


Thanks for the visual. I have watched your videos at least 5 to 10 times a piece. With Alzheimer's its always something different.
2
The winding method with a network cable that is described, is how I did in on my first DRSSTC: https://kaizerpowerelectronics.dk/tesla-coils/kaizer-drsstc-i/

3
Two GDTs is necessary for running pulse-skip mode with drivers such as UD2.9.  If not running pulse-skip mode, there is generally no reason to use two GDTs.  Only slight advantage of two GDTs would be lower leakage inductance IF the single-GDT alternative used only a single primary winding wire.  If the single GDT is wound with four twisted pairs, with one wire of each pair paralleled to form the primary, that is ideal for low leakage inductance.

Thanks a lot, been looking at different gdt methods for months now. I can't visualize 4 twisted pairs in the manner you spoke, will draw it out on paper, but that is what I will go with. Thanks again for the good info. My brain aint as fresh as 50 years ago. Later on
4
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: DRSSTC build
« Last post by Mads Barnkob on November 30, 2021, 08:10:17 PM »
The link to his website in the description is the old website, does not work anymore, go to https://franzolielectronics.com/ instead.

Your best bet is to look for the information on his facebook page: https://www.facebook.com/franzolielectronics/

Is this the specifications? https://franzolielectronics.com/alpha-dr/
Quote
Main controller: DD3a (It has been improved, please, check “Mini-DDR” driver)
Power Supply: 220VAC full wave rectified mains, closed-loop automatic pre-charge + line filter
Bridge: BSM150GB60DLC IGBT’s Full-Bridge
DC BUS: Laminated, 1x 400V | 2.7mF BUS capacitor + 2x 400V|4.7uF decoupling capacitors
Resonant capacitor: 6kVDC | 73.3nF MMC, 30x WIMA MKP10 2kVDC|22nF film capacitors, 3s10p
Primary coil: Flat, 9 turns of 6mm^2 wire, tap at 8.5 turns, acrilic cover, 3/8″ aluminium tubing strike ring.
Secondary coil: ~1400 turns, 100x341mm PVC form, 333mm winding, 31AWG
Top load: 350x110mm skeleton toroid, 7x 3/8″ aluminium tube rings
OCD: Set at 330A
CTs: 2x 1:32:16 = 1:512 cascade, same ratio for OCD and feedback
Resonant frequency: ~142kHz
On-time: Up to 120us
Duty-Cycle: Up to 8%
Enclosure: 21x21x14 (cm) 3D printed box, ABS
Height: 68cm
Streamer lenght: Up to 1.15m, measured in a straight line.
5
Dual Resonant Solid State Tesla coils (DRSSTC) / DRSSTC build
« Last post by balazs on November 30, 2021, 06:55:58 PM »
Hi!
I want ot buidl this DRSSTC:https://www.youtube.com/watch?v=p0UOJlfAuc8, and the wirning diagramm was on the video. Someone knows something on the primary and the secondary coil?
6
Quote
If thats it and i understood it currectly i will do it then you could judge it maybe!
Yes, I think you understand correctly.  Electrons don't pay attention to wire color, so just mark appropriately.  (May be a bit harder to verify correctness from pictures, however.)  If you look at any of my projects posted here, you will see that I'm entirely into the science, with almost no attention paid to aesthetics :).

Quote
FeedBack & OCD CT as suggested i did 23 turns per each core then i set two on top of each other and i passed one single wire of the front single one inside them and then i soldered and with an heat shrinking thingy i got it insulated, if you tell me is oky, i will proceed to hot glue or with some zipties to lock the cores in place thogether:
Looks good!

Quote
I saw on the amazing Mads DRSSTC guide that i sould keep everything metallic far from the primary (for heating problems), but i have planned and already bought the pices for the coil box frame in aluminum. and i planned to ground it all so that i could have a "faraday cage" already protecting the components without the need of strange wires or stuff going all around the box. i planned to leave it all open or to cover the sides with dark plexiglass (or normal transparent plexiglass with a black film behind to make it dark).
Not sure I have a picture of the frame, but aluminum close to the primary is likely to be a problem.

7
Quote
About the Interrupter Switch, I attached some images, indicating where it is.
During the initial tests I turn the two potentiometers position. But now I'm going to leave the duty cycle at very low (2M).
Thank you for the schematic.  When the switch is open, the driver is continuously enabled.  UCC27425 enable inputs have internal pull-up resisters.  Open is enabled.  If you want a switch to disable the coil, short enable to ground after the 5k series resistor.  If you leave the existing switch in place, make sure it is always closed during testing.  Yes, low duty cycle (2M) is good.  Of course, you won't get long sparks at low duty cycle.  It is still better for experimenting with primary coil polarity and antenna placement without frying transistors.  Then carefully increase power.

Quote
I'm going to add the light bulb. What is the capacitor specification?
To first order, whatever you have around that can handle 170Vdc and be mounted at the ECB.  (Not a small electrolytic, however, as that will have problems with RMS current being too high.)  I was thinking of a 1uF to 10uF film capacitor.  Or, a larger electrolytic.  The large electrolytic will support higher performance during testing with the light bulb, supplying peak current during the infrequent enable pulses.  However, that also increases risk of frying FETs/IGBTs.  So, at least initially, a film capacitor is lower risk to your FETs/IGBTs.

Quote
About the changes in the antenna circuit, I drew a picture of what I understood. Is it correct?
Yes, exactly.  The two resistors need to be the same value.  (Actually, the upper resistor to +5V could be ~20% higher value than the resistor to ground, since HC14 input thresholds are typically a bit below half supply voltage.)

Edit:  I forgot to mention an alternative to these two resistors.  You can instead add a single resistor, ~1Mohm, between 74HC14 pins 1 and 2.  This is actually better than the two separate resistors.  It will make the 74HC14 oscillate at a low frequency even without antenna feedback, which will kick-start the feedback.  You can experiment with lower resistor values to make the kick-start frequency close to coil operating frequency for even more certain startup.  BTW, likely easiest to add the resistor to ECB back-side, from 74HC14 pins 2/3 to one lead of the 1k resistor.

Quote
Other information: When I turn on the system only with the low voltage circuit, I hear a noise like a vibration, but when I turn the potentiometers, nothing changes.
Perhaps makes sense if that is with your existing enable switch open, so driver continuously enabled.  Might be line-frequency hum being picked up by the antenna.  If it still occurs with the 555 connected to enable and the 2M resistor set to 2M, then I'd be a bit concerned.

Quote
I also attached some images of the board without the components and the GDT.
Based on a quick review, layout looks reasonable.

Good luck!
8
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: gate drive transformer method
« Last post by davekni on November 30, 2021, 05:35:58 AM »
Two GDTs is necessary for running pulse-skip mode with drivers such as UD2.9.  If not running pulse-skip mode, there is generally no reason to use two GDTs.  Only slight advantage of two GDTs would be lower leakage inductance IF the single-GDT alternative used only a single primary winding wire.  If the single GDT is wound with four twisted pairs, with one wire of each pair paralleled to form the primary, that is ideal for low leakage inductance.
9
Dave is a real good guy and fast too! He often answers 10 questions before I can find time to read one topic :)

I must totally agree :D

Dave pretty much covered all of your questions, good luck with the coil!

Regarding the DRSSTC build if you are a beginner in electronics/Tesla coils.. building a DRSSTC is not easy, you use commercially available components partly in a way they are not designed for. The challenge is in the making the coil working with the parts you can get, and there are many parameters of the coil which depend on the choice of the parts. It is possible to build a DRSSTC without previous experience with Tesla coils, but if you are new to SSTCs or DRSSTCs I'd highly recommend gaining a little more experience by building simpler non-resonant SSTC first before moving on to DRSSTC.

I totally get it, and i know that DRSSTC is mainly based on parts you have or you can find for cheap and you need to use them in a non conventional way, and i know that me being not much experienced its not super great.. but i also always wanted to do one coil like this as i said in my introduction of this forum. and i cant wait anymore since i buyed everything (i had a guy i mentioned before that i was supposed to do this with.. but then he rellay turned out a shi**y person so im on my own) with the 90% of expensive components already buyed out.. i just want to try.. i have already a scope too so i can totally learn something at least... if the coil fails... im oky with it.. as long as i really tryed you know... i want to learn makeing things explode more than study books (that i already do a lot googleing around 5-8 hours a day tho)..

Thx for your nice replay anyways! And maybe if i need help.. you could help me out in the future.. or maybe.. i could help you out with non tesla stuff if needed haha!
10
Dave is a real good guy and fast too! He often answers 10 questions before I can find time to read one topic :)

I must totally agree :D

Dave pretty much covered all of your questions, good luck with the coil!

Regarding the DRSSTC build if you are a beginner in electronics/Tesla coils.. building a DRSSTC is not easy, you use commercially available components partly in a way they are not designed for. The challenge is in the making the coil working with the parts you can get, and there are many parameters of the coil which depend on the choice of the parts. It is possible to build a DRSSTC without previous experience with Tesla coils, but if you are new to SSTCs or DRSSTCs I'd highly recommend gaining a little more experience by building simpler non-resonant SSTC first before moving on to DRSSTC.


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