See https://teletype.net/display/TEL/Volpe+USB+Interface+Board

I made a run of these Volpe boards back in 2019. Unfortunately my remaining few boards have been claimed-- I just need to get them out the door now. I should have doubled my initial order-- would have made the boards a little cheaper, and I'd still have a hundred lying around for those interested. I'd like to do another run sometime, but realistically I likely wouldn't get around to it until next summer or fall. There's nothing stopping anyone else from doing another run, though it can be a lot of work to handle orders and such and ensure all the components you're using are compatible and correct, and you're putting up a fair bit of financial capital, too.

You can also assemble one using through-hole components. I assembled a couple of these before I did the manufactured run in a morning, and I'm probably pretty mediocre at soldering. I wanted to get notes down to help anyone interested in getting the right components for through-hole assembly, but that's another thing to which I haven't gotten around. Still, what I have written down is in the link above under the "Build Your Own" section.

Anyway, whenever I am able to do another run, you'll see an announcement on the list here. It's a good board-- been using these for 15s/19s since early 2018 now-- all the videos of my machines are leveraging some version of this board. They'll work for pretty much any other model that leverages current loops, too. I hope to be driving a number of 28s with these whenever I find time to start working on cleaning them up.