I downloaded a KS3102-2 user's manual about a month ago. As I recall, I had to go to Koss Canada's FTP server and modify the address to this model. I'd be happy to upload the PDF, if needed.

If anybody has a schematic of this unit I'd sure appreciate the info. I got one off of Craigslist, and while it isn't the most productive use of my time, I'd like to dig into it. The chipset (from T.I.) is surprisingly efficient, as seen by an analog person!

Brian