This is a re-creation of an interface card called "Datel Robotek" for the Sinclair ZX Spectrum computer. This card is long lost in the history and very hard to find as original now. I have designed the PCB according to the original schematics contained in the book "Make and Program Your Own Robots". The book also contains many type-in projects using this card written in Spectrum BASIC. There were some mistakes in the schematic, which I have corrected. This is a tested and working project. All the components are thru-hole type and their part numbers, orientations are clearly indicated in the silk screen, making the assembly very easy.

I haven't included a BOM file because all the parts are thru hole type and their part numbers are clearly written on the silk screen. They are all very easy to get, very common parts, except for the relays. Unfortunately they are only available from Chinese sellers in AliExpress or eBay. Search for the exact part number TRKM S-Z L05V