The latest incarnation hasn't wandered too far from Adrian's original design. As I look at the latest schematic I believe you can even implement his exact original circuit by selectively populating the board with the original parts. The modified version does add a half-dozen or so line-items but it still looks to me like $10 or so in parts.
Some of the components are needed in quantity 1 whereas even at DigiKey you can save quite a bit per unit by going to quantity 10.
Adrian shows a red-black pair of alligator-clips to attach to the TIU output jacks. Obviously they don't have to be red and black, but try finding "just" 2 alligator-clips leads. Or maybe everyone already has these clips lying around. At DigiKey it looks like you buy a set of 10 double-ended cables for about $3... of which you only need half of a red and half of a black.
https://www.digikey.com/produc...1568-1582-ND/7056460
My guess is most guys would prefer a built-and-tested version...rather than firing-up the soldering iron, ordering DigiKey components, ordering bare circuit board(s) from OSH Park / SEEED, etc.. I might have missed it in the conversation but has anyone stepped up to providing completed units...or if not then at least a kit of parts?
