I was trying to base the 3207 pcb layout on jorge's 3007 but I've discovered that the 3207 scheme (on the 1st or 2nd page of this thread) is not exactly the same, with several changes and specialy with less components (8 resistors and 3 caps if I've counted correctly). 3007 scheme is nearer the original SAD1024 scheme. Can somebody explain me why?