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spdif to optical

X

XCLR82XTC

Limp Gawd
Joined
Dec 23, 2009
Messages
315
so i have the two spdif pins on the mobo. how do i turn that into an optical signal for my hdtv? the only HD audio input i have for when im using hdmi, is the optical port. (for when hdmi is only carrying the video)

i saw a guy on youtube that made his own with an LED, and some wire...is that all there is to it?
 
XCLR82XTC said:
so i have the two spdif pins on the mobo. how do i turn that into an optical signal for my hdtv? the only HD audio input i have for when im using hdmi, is the optical port. (for when hdmi is only carrying the video)

i saw a guy on youtube that made his own with an LED, and some wire...is that all there is to it?
Click to expand...

Maybe that is, but this is the more complex way:
http://www.taligentx.com/projects/opticalconverter/
have fun.:eek:
 
i have 8 channel high def on board...why would i use that lol?

i think that cable will work...its called a spdif header cable, so i found a few on ebay.
 
The S/PDIF header should be at logic level and include power. I'm not sure of the pinout, but it's designed to be connected directly to a transmitter. You might be able to jury rig an LED and resistor to do the job, but the proper transmitter part is really not that expensive and will seat the optical connector properly.

For example this transmitter (motherboard usually provide 5V not 3.3V logic here) is really all you *need*. Add the recommended 0.1uF decoupling capacitor at the power pins of the transmitter and mount it somewhere and you're done. Cannibalize the 3-pin connector from something else.

If you need to go to a coax output from the motherboard, or from a coax output to optical you need a slightly more involved circuit.
 
keenan, isnt that what the cable that i posted does? the impression from the description is that it has some kinda chip in it.
 
XCLR82XTC said:
keenan, isnt that what the cable that i posted does? the impression from the description is that it has some kinda chip in it.
Click to expand...

It should be since it has a coax output. There are lots of different circuits floating around for driving the coax properly. That cord probably includes something functionally very similar to the one jeremyshaw posted. For the optical output it should be exactly as I described. Should work fine, but you asked about doing it yourself ;).
 
keenan said:
It should be since it has a coax output. There are lots of different circuits floating around for driving the coax properly. That cord probably includes something functionally very similar to the one jeremyshaw posted. For the optical output it should be exactly as I described. Should work fine, but you asked about doing it yourself ;).
Click to expand...

yeah i was gonna do it myself b4 i realised a header calbe was 8 dollars lol.
 
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