Here is the thread if you like to join in: thread about adding SPDIF/TOSLINK port .
These pictures are of the inside. Note the white wire is connected to test point 60, the red to the output of the voltage regulator and the black to a ground - in this case the tab of the voltage regulator. The SPDIF/TOSLINK transmitter came out of a PC's drive bay adaptor. The type that brings all the USB and sound cables to the front of a PC. I didn't find specifications for the SPDIF/TOSLINK transmitter, but assumed the +5 volts I found at the output of the voltage regulator would be a good source of power as the drive bay adaptor was using the +V lead of the USB cable.
Here's a picture of the rear of the unit. I used a dremmel and file to make the (near) square hole for the SPDIF/TOSLINK connector.
I used a really cheap SPDIF/TOSLINK cable (sub $10), but can't see where even the bulky expensive ones wouldn't fit next to the other cables.
I have been using Linux and the extracted "DONGLE.BIN" file to power my MediaMVP. Interestingly, I have noticed the SPDIF/TOSLINK output of the MediaMVP using this software is capable of outputting different sampling rates. Here, I am sending data from a MP3 which originated from a CD. You can see the amp has identified the signal as having a frequency of 44.1KHz.
And here, I am sending the MediaMVP a video which originated on a ReplayTV Personal Video Recorder. Note the sampling rate is now 48KHz.
