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Do you have any of these boards left? I am interested in acquiring one. Alternativly, are you planning on uploading the Gerber files with the documentation on your site?
Just a quick update - the boards have since been sold out. Who would have thought 25 would go so fast? I also posted all the files and gerbers on my website for you all to make your own! I've also included a direct link to a mouser cart with all the components so you can just buy all the parts with one simple click. :)
As always, let me know of anything you might want to be added to the next revision since this will probably be an ongoing project.
Sent a PM last time and no response. Missed out on the board. So please put me down for 2 (green is fine). Will send PM with details too. Thanks.
Sending another batch out :) and looks like green is popular. Apologies for the last time but the previous batch ran out really quickly and were out before I got your message. You're on for this one :) There are a small number of tiny changes I wanted to make as well, mostly physical changes, such as:
- Jumper for UVLO to enable/disable it, or Increase solder-pad size for UVLO voltage reference adjustment (or add a SMD potentiometer) - Add additional space for extra and optional gate drive rail capacitor of your choice (I found more capacitance was useful for long-pulse operation such as in QCWs when the 24V rail would drop too much especially when using a 18VAC input, but not required for normal DRSSTC operation)
I found them to be useful for example if you wanted to run at a lower gate drive voltage such as 20V instead of 24V (could be useful for long pulse runs like in QCW mode to reduce gate drive power), and will also slightly improve silkscreen labeling.
[Edit]
I also had several requests for a kit / assembled board, and I just wanted to point out that it is unlikely for me to do a parts kit or assembly, mostly becuase it would end up a bit too expensive and take too long for me to assemble the boards since I'll have to do it by hand. In addition, I asked several people and it looks like folks would already need to make orders for parts anyway, and many people already have extra items on hand such as expensive fiber transmitters etc. I also didn't think this would be appropriate as a money-making thing since the rights do belong to Steve Ward as well as the hard work done by other folks like Bart and Eric in previous revisions. I've tried to make the board easy to hand-assemble with many parts clearly labeled and hard-to-solder pads improved, so hopefully this helps :)
UD2.7 Rev B Render:
Here's the very slightly revised board with no electrical revisions except for added UVLO header, UVLO voltage set point pot and an extra spot for more capacitance (can use for example a large 8x20mm 680uF 35V cap or whatever you want, which can be mounted sideways on the board, top or bottom). The new UD2.7B board will look like this if you're interested. Batch to be sent out this weekend and shouldn't take more than 2 - 3 weeks to arrive.
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i am certainly in no hurry, but i am wondering if there is any kind of time frame on the arrival of these boards?
are we talking a couple weeks or a couple months? I know once i have it im going to want to build something with it and i have a lot of stuff to learn/ parts to collect.
i am certainly in no hurry, but i am wondering if there is any kind of time frame on the arrival of these boards?
are we talking a couple weeks or a couple months? I know once i have it im going to want to build something with it and i have a lot of stuff to learn/ parts to collect.
UD2.7B Boards arrived, soldered them up and it checks out as expected and tested the frequency range up to 800kHz. Drop me a note if interested. Note that the big capacitor (C4C) is *optional* and I normally wouldn't populate it.
Note that I added about 1200uF of extra capacitance on the 24V rail for long pulse operation, but this is not required in normal DRSSTC operation. Remember to adjust C33 to suit your needs.
So far I'm quite happy with the board and am unlikely to make further changes in the near future. Instead, will be making a simpler but more powerful programmable driver. But that's a story for a another time~!
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Universal Driver 2.7 Rev C
