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Messages - futurist

Pages: [1] 2 3 ... 9
1
Solid State Tesla Coils (SSTC) / Re: Nice PC Board Tesla
« on: June 11, 2021, 12:03:24 PM »
That's really impressive output :D
Got me interested in trying building it

2
General Chat / Re: Photonicinduction is back!
« on: June 08, 2021, 12:55:01 AM »
Its great to see him back :)

I had two videos planned to tribute his madness of overvoltage, I will do them anyway...


Mads could we ask him to join hvf? :D

3
General Chat / Re: Photonicinduction is back!
« on: June 07, 2021, 04:32:02 PM »
Wow this really made my day :D

I thought about him last week when I got myself three phase variac and watched few of his videos

4
Looks nice! I like the idea of having switches to physically turn off outputs, maybe even add one master switch for all outputs?
Is the board designed to fit in particular enclosure?

5
General Chat / Re: TV cameras and DRSSTC(how do they go together)
« on: May 20, 2021, 09:59:02 AM »
What happened?

6
Check Richie Burnett's website
http://www.richieburnett.co.uk/operatn2.html
Be sure to disable SSL or pictures won't load

I remember there was some discussion about coil tuning and current notching, try searching my DRSSTC build

7
Good job! I can't believe you did this all by yourself  :D

Svaka čast da si sa 14 godina uspio dovršiti tako kompliciran projekt, za bilokakvu pomoć stojimo na raspolaganju  :)

8
Short answer - there is no advantage using those caps, you could use whatever you can find
I use 0.68 uF caps for my DRSSTC https://highvoltageforum.net/index.php?topic=78.msg330

There was some discussion why .15 uF CD caps are so popular among Tesla coil enthusiasts which I can't find right now. I don't remember exact conclusion but they were probably available back when hobbyists started building spark gap coils and they proved good, and they stuck as standard even for DRSSTCs

9
X-ray / Re: Intensifying screen
« on: April 23, 2021, 10:39:36 AM »
Something like this?
https://www.ebay.com/itm/284224950384

I don't think it's viable making one yourself

10
Hi

we had few threads on the forum regarding chinese DRSSTC drivers and their disadvantage is complete lack of documentation
I'm sure most of them work fine, but I suggest that you go for UD2.7C since it'll be easier to solve any problems you might encounter

Good luck and happy coiling!

11
Sounds excellent! Could you share your midi files?

12
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Jimmy drsstc
« on: March 10, 2021, 05:10:35 PM »
Did you notice his website banner? :D


He ripped off my DRSSTC so I am ripping off his title

13
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Jimmy drsstc
« on: March 10, 2021, 11:44:54 AM »
Interesting! Based on build log dates and nickname he was 16-17 years old
Where is he now?

14
I experienced stuck notes with my previous interrupter, but this is different. MIDI is playing with different pitch until I restart midi to serial converter

15
@futurist:
Thank you very much for sharing! Couple good songs among those clips. And some really intense arcs as well. Did you push the limits or are these coils capable of even more?
What happened at 1:47 in this video??

Bigger coil runs bellow it's limit, although it's limited by the streamers hitting ground. I'm happy how it performs, it's powered only with one SKM400 half-bridge module
Smaller coil is powered with double TO-247 half-bridge with 300 Apk OCD, which is near it's limit. I still have to tune it properly and I'm sure it'll do ground strikes without triggering 300 A OCD
I hope that forum thread with build details for smaller coil will be finished soon

I'm not sure what happened at 1:47, it happened a few times before that, and I had to restart midi to serial converter to get it working again

What do you mean by „two channel MIDI“? Or in other words, what midi are you looking for?

MIDI files edited so that one coil can play one set of notes and other coil can play other set of notes

16
I finally got footage of my MIDI experiments with two coils, recorded on 01.11.2020.
I didn't have any two channel MIDI songs unfortunately

Everything performed exceptionally well although it was set up in a hurry

It seems that quite some time has passed since last experiments, however I'm only home at weekends and I'm doing experiments outside, borrowing power from a guy who has a workshop in abandoned industrial complex, so I'm dependent on good weather and on the owner who isn't always available

Check out youtube playlist I made
https://www.youtube.com/playlist?list=PLlkH_ZpBGiexB1ahBjtajvHqJAfMIxrB1

17
Short polyphony test - everything works great! Bad weather here for the second weekend so I can only play with small coil
It actually sounds much nicer in person, phone isn't suitable for recording such high volumes



< my new favorite DRSSTC midi






Sorry for vertical recording, this was a quick test. After 10 minutes of playing at full power secondary got pretty hot and I had to stop. Inverter and MMC barely warm, bus caps pretty hot
If I didn't mention before coil is powered with chinese 40N60 double half-bridge. It still needs tuning, otherwise my OCD LED will burn out. Settings are duty-limiter 15%, max. on-time 280 us

18
I guess you're using a SMPS for the UD+? At least my Meanwell SMPS is able to maintain it's output for a few seconds even with two relais and the UD+ drawing current.
What LEDs do you mean? I can't see LEDs on your Syntherrutper so I guess you talk about those connected to the UD+? Which wouldn't be that surprising; although it's no real help either.
LEDs on UD+ and precharge controller, really strange. It all happened in a few seconds in the dark, so I didn't catch every detail. Next time I'll setup camera to record the whole test

That's very strange indeed. Since it continued to buzz the Tiva microcontroller did obviously not crash* but then remains the question what happened.
A word about the error screen you saw. It is not part of my firmware. Its part of the Nextion bootloader, which runs my firmware. Usually you see a bootloader message only when there's no firmware, a corrupted firmware, or during a firmware update. But if the firmware has been compiled successfully and uploaded successfully, it shouldn't appear. Hence I've never seen that error, and I haven't found anything about it. I assumed that when the Tiva microcontroller crashed it sent a ton of gargabe to the Nextion, causing that one to crash, too. But since you say the microcontroller continued to operate, that makes not much sence anymore. Like the rest.
I think we have to pretend it didn't happen until I test the coils again, with oscilloscope and camera to catch any problems

Do you think I can set duty limiter to 15-20%?
Probably yes. Here's what I'd suggest. Increase duty step by step (5 percentage point steps sounds reasonable) and keep an eye on the temperatures, maybe on the current consumption, too. As long as nothing gets too hot or fries something like the input rectifiers (or the fuses) it should be no problem to increase the duty.
I'm curious what was max. duty cycle with my onetesla interrupter turned to 300us max. on-time. I think I'll hook it on the oscilloscope and measure, I wouldn't be surprised that it's around 20% for MIDIs like popcorn. SKM400 halfbridge was barely warm with onetesla interrupter on max., MMC is overkill for this coil and is always stone cold. I blew few 16A fuses with the final countdown song solo part


Can't wait to test the stereo feature!

19
Sorry I completely missed your post about note duty limit, makes sense now

Quote
I‘m very curious to hear what you mean with „changing on-time didn‘t behave like [expected]“!
It seems that spark length is not changing as linearly with on-time like on my old interrupter, but it could just be my personal view

Quote
Since you write you wanted to turn off the outputs - was that a reflex action or was it actually still generating an interrupt signal?
The coil continued to buzz, I panicked a little after I saw that the interrupter has crashed. I don't know why UD+ UVLO didn't trigger. All LEDs turned on, a pity I didn't record it.. very strange

I doubt it had anything to do with EMI, laptop and interrupter were far away and USB cable is short and shielded. Also I'm only using one output, so current shouldn't be a problem
I was using latest firmware

Do you think I can set duty limiter to 15-20%?

Next time I'll test two coils at once, does someone have MIDI files for playing on two coils simultaneously?

20
Hi Max

I couldn't test the coils during summer because of the neighbors >:(, then I found a suitable place in abandoned industrial complex and I borrowed power from a guy who has a workshop there
I'm only at home at weekends, however last 4 weekends it was either rainy or windy. Yesterday I finally managed to test the interrupter on my bigger coil and I ran into a few problems

I set coil limits to 300 us and 10% PWM
I'm still not familiar with volume setting on MIDI live and I couldn't figure out what each of the option does. I changed only on-time, didn't touch note PWM setting. However changing on-time didn't behave like changing on-time on my onetesla interrupter for some reason. I didn't have enough time to bring the oscilloscope and to examine what is exactly happening

Most of the midis played sound very nice, I couldn't record all of them so here are two short clips


Some songs sound bad because of (I presume) PWM limiter, it sounded like the note is "chipped". In super mario theme it's not that bad, but it can be noticed if you listen closely

At one point the coil made loud "pop" sound and it blew the 16A fuse. I quickly tried to shut down the midi playout but I then saw that the interrupter has crashed


I was sure that IGBT died because of how the coil sounded when it blew the fuse, but luckily it didn't. OCD or UD+ pulse limiter probably saved the coil
Sorry for sparse write-up, ask if I forgot something  :)

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