The final set (at a minimum) converts the balanced output from the DAC to non-balanced output suitable for most consumer uses. I've completely omitted the final opamps on one card that I've modified and route the + and - outputs (and ground) to a pair of Neutrik XLRs for use with some powered...

Inside a typical computer case is pretty RF-heavy, so it's hard to say what you can pick up with a random length wire in there. My curiosity about the induced noise stems from a different project I was working on -- off-board linear regulator (12v to 5v) for an embedded GPS. The GPS would lock...

Wow, now there's some nice work. I'm wondering if you're getting any high frequency noise added due to the length of the power supply leads from the regulators? Maybe a couple of ferrite beads on the DC supply leads wouldn't hurt? Has anyone else considered removing the DB-9? The DB-9...

Finished modifying one 0404, almost done with a second. Pics and running log at: http://www.cs.wisc.edu/~timc/e/emu.html