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Messages - futurist
1
« on: December 05, 2023, 02:28:17 PM »
Hydron is responsible for UD2.7C UVLO design It's probably easy to find an alternative method to the LM8365 which is both through hole and works better as well.
This particular part was picked due to convenience more than anything else, I wanted an UVLO in my driver and modded the UD2.5 layout to include it, and the LM8365 was a) easy to use with just 3 extra parts and b) I had one in my box of random ICs. Loneoceans then included and improved it in his UD2.7 design (along with good documentation and other improvements - thanks!).
There is a limitation to doing it the quick and easy LM8365 way - when the 24V supply rail gets really low (e.g. 8V or lower) the chip can stop working, which means the UVLO will stop working and the driver can still try and switch the IGBTs, putting them at risk. To solve this (and enable through hole construction) I would suggest you use a comparator like the LM311 (already in use for OCD), and have it sensing the 24V supply on one input, and a zener or similar reference on the other, placed in parallel with the OCD LM311 output. The LM311 will run down to 3.5V or so, which is low enough that the IGBTs won't be turning on anyway, and can be powered by the 24V supply to make the circuit as simple as one resistor, one potentiometer, a zener diode and the LM311 (maybe plus decoupling cap). See my MSPAINT drawing for an idea of what to do:
2
« on: January 23, 2023, 06:21:07 PM »
Nice work so far! Are you planning CM300 half-bridge or full-bridge? Check out my similar 160 mm coil https://www.highvoltageforum.net/index.php?topic=78.0I'm using SKM400 half-bridge with 340nF MMC, originally I had CM200 half-bridge and both worked great I would suggest you use CM300 half-bridge with voltage doubler for your coil, especially with 240 VAC mains here in Europe Mine survived 7 years of occasional use and I'm sure the inverter won't fail anytime soon. I recently rebuilt it, changed DC power supply and rewired everything- now I'm waiting for some good weather to test everything out
3
« on: August 18, 2022, 02:07:10 AM »
Hello
I'm glad that you solved the issue but I'm still not sure what happened with the 2412 receiver Can you post some more details? Perhaps you could try scoping the faulty receiver while it's connected to the interrupter
In future when posting such questions please include as much details as possible, photos of the setup, scope shots, etc. It's impossible to tell what's wrong with the driver based on the info you provided in the first post
4
« on: June 27, 2022, 06:14:48 PM »
Magic smoke caught in IGBT goop
5
« on: May 04, 2022, 05:24:07 PM »
Order what you can and I'm sure we'll find the rest of the parts
I think I have all the 74 series logic chips needed for UD2.7
6
« on: April 28, 2022, 12:54:11 AM »
Hi
which parts are unavailable?
7
« on: December 21, 2021, 12:21:06 AM »
Congrats! Nice work and attention to details, no switching spikes. Topload looks great!
How do you pre-charge bus capacitors?
8
« on: December 20, 2021, 06:44:30 PM »
I can't believe that the forum is 4 years old Big thanks to Mads and others
9
« on: December 13, 2021, 08:20:21 PM »
Update I sold blue soldermask drivers and I still have two red ones left Photo PM me if you're interested
10
« on: December 03, 2021, 01:37:46 AM »
Hi and welcome to the forum I had similar design goals for my first DRSSTC, I wanted it to be easily transportable and powered from mono-phase 16 A 240 V outlet Check it out https://highvoltageforum.net/index.php?topic=78
11
« on: November 30, 2021, 01:19:18 AM »
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 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.
12
« on: November 28, 2021, 06:12:44 PM »
Thanks for sharing Lots of similar places here in Croatia unfortunately, I'll post some of my photos
13
« on: November 09, 2021, 11:41:16 PM »
Wow those are really impressive streamers! That 350A current draw reminds me of mr. Photon, a plug straight to the National Grid?
14
« on: October 25, 2021, 07:14:25 PM »
Hi and welcome to the forum Please read forum rules before posting https://highvoltageforum.net/index.php?topic=31.0In order for someone to help you please show you have done some troubleshooting on your own and provide more information about your circuit, like photos of the circuit and scope shots
15
« on: October 19, 2021, 10:53:46 PM »
Electrical insulation for wood supports may work too. I'm a bit concerned about long-term corona damage to the kapton, depending on how conductive your wood happens to be. Likely fine in the short-term, and may last well enough into the future. Thicker Kapton (more layers) will help longevity.
I use laser cut wood primary supports without any isolation for both of my DRSSTCs and so far I didn't have any issues
17
« on: September 28, 2021, 05:34:30 PM »
I used tinkercad to design 3D printed parts, laser cut parts are designed in librecad I think it should be straightforward to add third dimension to laser cut parts to make them 3D printable
If the secondary is wound on 75 mm diameter drain pipe you could 3D print endcaps and toroid stand-off prof9dc double TO-247 full-bridge would be really nice for my coil also, allowing more primary current
18
« on: September 21, 2021, 04:18:47 PM »
Counterpoise from wire mesh, for example I'm using insect mesh because it's easy to store it in a roll /> There was some discussion about using counterpoise for DRSSTC here on the forum and on 4hv. In my experience my coil performs better when used in different environments if I'm using counterpoise. On the other hand it causes high current ground strikes which fry the secondaries
19
« on: September 20, 2021, 10:38:31 AM »
Some secondaries survive many hours of run time, but eventually they all fail
Did you try using counterpoise? In my experience it seems that it directs streamers away from the coil
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