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I have a monitor that I want to use as my 'TV' for my gaming system. I connect it via HDMI, so sound and video go through the monitor, but I want sound to my headphones, which travels via optical (S/PDIF) cable. The monitor (Dell U2713HM) has a 3.5mm audio jack on it for line out, but I couldn't find anything that simply plugs in an converts the analog audio signal to a digital one so I can plug in a S/PDIF cable. What sort of device do I need to do this? (I am not asking for shopping recommendations, merely what options allow this conversion. I would prefer the smallest option, as space is limited).

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    hmm, thats odd - can't recall seeing headphones that use SPDIF... what're they? – Journeyman Geek Jun 24 '13 at 16:04
  • @JourneymanGeek Not simply headphones, but gaming headsets (they combine voice chat and surround sound). I realize I'd probably lose the surround sound capability, but all I really want is the audio – SSumner Jun 24 '13 at 17:19
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There are specific converters for that - such as this one - you’ll need a 3.5mm to stereo RCA cable, connect that into the RCA to S/PDIF adaptor I linked to you should be good. If shopping around, make sure it takes stereo in, and outputs to TOSLINK since these adaptors don't work the other way

This does seem un-necessarily complicated since most modern PCs have optical TOSLINK, and it’s a simple matter of picking that as your default sound out from your mixer.

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You can purchase something of the sort like this cable, and then use an RCA to 3.5mm adaptor. I did the same thing when my TV was broken, ran HDMI through my monitor for video and used speakers through that wire for sound.

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