Greetings....  I'm new to RP's and noticed this post yesterday.  I already have several interfaces that I can use but I'm curious about the circuit and how it differs from one called "The USBlink" from G4ILO.  I don't see anything when I click on the BMP file.  I've gone to the OP's website but he does not have this particular circuit in his list of DIY.  Do any of you have a copy of the schematic?  If not, no a big deal.... I was just curious. 
Best 72  -  chq