Hi RTR12....Thanks for the info and the link to the new discussion...just finished reading all the pages...all good stuff!
Are you selling the PCB boards? I'd love to build one of these and very interested in buying one. The device would definitely allow me to easily check my TIUs for failure (I have one Rev. L that's suspect already).
BTW....which version of the board did you get produced....singe LED or dual LED?