@Rod, those connectors I can find here in many, many versions!
As for power supplies, I insist on using old laptop power bricks as much as I can, but lately I can not find much of them. They are very good, filtering is good, completely isolated, current limited (this becomes very important when something goes wrong), and firing 2 or 3 of them in series is easy as they are isolated ( be aware that some do have the grounding wired to the negative output terminal, so. It has to be disconnected, simply done by using a power cable with no ground contacts ).
FYI, avoid at all cost power supplies made by "horoz" , they have a picture of a chicken on them! No idea why. They tend to burn to a crisp on their own, burning the filtering coil on the output side. That is magnificently and undeniably done by someone with zero knowledge of electronics. As luck would have it, that was the only manufacturer found here for over a year! Now there are plenty of good ones.
