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:

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

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

Congrats! Nice work and attention to details, no switching spikes. Topload looks great!

How do you pre-charge bus capacitors?

Update

I sold blue soldermask drivers and I still have two red ones left

Photo




PM me if you're interested

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.

Wow those are really impressive streamers!

That 350A current draw reminds me of mr. Photon, a plug straight to the National Grid?

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

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

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