I checked the website, and this looks like a really interesting project. One that I would probably build myself... once I get a car that will actually output OBDII diagnostics info :lol:
However, since this is a commercial product, your best bet is probably to buy it. It looks like you can buy the PCB only... Sounds like a good and cheap way to tinker with the circuit.
I understand that, but have you checked the prices? **broken link removed**, which is less than $13US for the bare PCB... You can still supply your own low-cost parts and build one very cheaply. I can't imagine making your own PCB costing much less than that?...
Guess who will provide you with a parts list when you send them 7GBP?...
ISO OBD-II / VAGCOM 3.x RS232 Opto Interface Bare PCB
Description:
* Bare PCB
* Comes with circuit diagram and parts list.
* Opto Isolated based design
* When built it works flawlessly with 3xx versions Ross-Tech's VAG-COM
* RS232 Serial port design, supports challenging time-critical applications like serial EEPROM programming and ECU Tuning.
* Does not come with any components nor flying leads.