Quote from Ron Rollo on February 24, 2023, 8:08 am

Thanks Roel!

Yes, I designed the pcb and had it made.  Some of the early versions of the CDU were done in multiple layers, more than two, maybe up to four.  I am not sure about the newer versions, but I was able to do it in only two layers and double the amount of LEDs and also include current limiting smd resistors for each LED.

Will Sasse did it in two layers and I was even able to do it using double sided copper clad.  I will be making the CDU drawing publicly available once it is 100% proven, but for now, I will send you the latest version so you can see what is going on with it.