Originally posted by: timotl
No matter what supply voltage these modules are expecting, I'm fairly certain they are expecting a TTL level input not coax.
I managed to get the Asus bracket working for both coax and toslink.
The Asus bracket is expecting a TTL signal to run the toslink transmitter and it converts it down for the coax out.
I used the Coax -> TTL circuit on this page with a couple changes:
http://www.andrewkilpatrick.org/mind/spdif/
timotl -
Wow, thanks for the good info. As my ASUS moboard will drive the bracket without a +5V line, it makes sense that its using a TTL signal. Interesting that the bracket will still drive the coax out regardless...
Looks like you used a specialized logic chip to build this... was it one of the Phillips hex-converters? If so, which one did you use and where do you recommend getting it? Did you pull your +5V off the USB port or did you get it somewhere else?
- HJ