I just bought a Gigabyte B75M-DH3 motherboard and built a new HTPC for TV viewing and to replace Verizon STBs using HDHomerun Prime. The audio has been somewhat challenging for me. Currently just watching via the TV speakers (HDMI to TV) - when I tried the Samsung TV's digital optical out from whatever source is selected to receiver I noted I can only get stereo (Dolby pro logic) even on channels which are broadcast in Dolby Digital 5.1 (my receiver does not do HDMI)
The computer motherboard has a Realtek full HD two pin SPDIF header which is noted to be enabled and working in the audio part of control panel. Seaching on the web I saw a lot of information about connecting such a header to a video card or sound card to enable mutl-channel out on either peripherals optical or RCA digital audio outs. Also saw discussions about internal SPDIF headers being 5 volt; with tosllink still using 5 volt even though optical and RCA being reduced to 0.5 volts.
I found this direct connector on the web that seems to indicate that you can use it to directly connect an RCA digital audio output from motherboard SPDIF header (ground and signal - which is what I have available), allowing me to get full digital output to my receiver
Any feedback on whether this will work and hopefully not result in frying my receiver or motherboard.
link to connector I have sent for:
This cable can be used to transfer RCA Composite Video or RCA Coaxial SPDIF to the front panel. It connects to the Composite Video or SPDIF header/pinouts on the motherboard, sound-card or video-card.
Please take notes of the "IN-OUT" icons as shown in the pictures on the right.
This cable can be used for dual purposes, i.e. for "IN" or "OUT" usage. The port holder can be turned 180 degrees to mark the port either as "IN" or "OUT" function.
RCA VIDEO / SPDIF INTERNAL
FRONTX RCA Video / SPDIF Internal
Half of small bay
RCA (nickel plated) female
1x3 header connector female
28awg X 1c (UL 1533)
Length - 2.5 feet (762 mm)
Black: Ground / GND
White: Composite Video Signal / SPDIF
HEADER CONNECTION GUIDES
Diagram 1: On most motherboards, the composite video header/pin-out consists of 3 pins in one straight row.
Diagram 2: Simply plug the connector onto the header, in such that; the white wire is connected to the video signal pin (IN or OUT depending on your usage) and the black wire to the ground pin. No connection to the NC pin (empty) is required.
To connect to SPDIF header, simply connect the white wire to SPDIF pin (IN or OUT depending on your usage) and the black wire to the ground (GND) pin.
You might have to rearrange the wires to match with the pin assignments, or change the header connector if necessary, depending on the layout of the video / SPDIF header.