VideoHelp Forum

Our website is made possible by displaying online advertisements to our visitors. Consider supporting us by disable your adblocker or Try ConvertXtoDVD and convert all your movies to DVD. Free trial ! :)
+ Reply to Thread
Results 1 to 13 of 13
Thread
  1. Mod Neophyte Super Moderator redwudz's Avatar
    Join Date
    Sep 2002
    Location
    USA
    Search Comp PM
    This is a bit hard to see, but I have a S/PDIF coaxial adapter plugged into this MB. The red box shows the adapter. The PCI slot connector is laying there. The green is the MB coaxial S/PDIF connection. The yellow is the optical S/PDIF connection. Both have exactly the same signal.



    Click image for larger version

Name:	pc 020.JPG
Views:	6268
Size:	84.2 KB
ID:	6333

    This is one of the factory S/PDIF coaxial and optical PCI backplane adapters:

    Name:  72c6_35.jpg
Views: 57778
Size:  5.5 KB

    You can also use an external optical to coaxial adapter if you just have optical out and need coaxial. I use this one on a WDTV box to get coaxial output: http://www.monoprice.com/products/product.asp?c_id=104&cp_id=10423&cs_id=1042302&p_id=...seq=1&format=2

    I have also made my own adapters with a blank PCI slot plate with a RCA jack installed. I used an old CD audio cable and just changed the pins around. You only need two wires for coaxial audio, the red and black. The third pin on the MB S/PDIF connector is 5VDC power and isn't needed. It's used to power a coaxial>optical converter if you need optical S/PDIF output.


    A short guide to making your own S/PDIF coaxial audio connector for your motherboard:

    First check your motherboard manual to see if you have a S/PDIF output connector. You may also have a S/PDIF input connector. The output connector is usually labeled 'SPDIFO', the 'O' being for output. The input S/PDIF connector is usually labeled 'SPDIFIN'. Pay attention to the orientation of the connector. You only need two leads, the signal lead and the ground lead. Don't use or attach the +5VDC lead if you are just wanting coaxial audio. Most modern MBs have at least a S/PDIF output connection. If you want S/PDIF optical instead, then you generally need a factory adapter, or I believe Monoprice carries external coaxial>optical converters also.

    This is from the MB manual for a ECS R485M motherboard showing the S/PDIF output connector.

    Name:  SPIDFOMB.JPG
Views: 139766
Size:  21.1 KB


    This is the pin designation. Pin 1 is the signal and Pin 4 is the ground. That's the only pins you need to use.

    Click image for larger version

Name:	SPDIFPO.JPG
Views:	2482
Size:	40.2 KB
ID:	6370


    These are the parts needed: A blank PCI backplane insert. Yours may vary. A CD to MB audio cable. These aren't used for DVD drives, so there are a lot of them around. You can also use other connectors that have a 0.1" pin spacing. PC case to MB front panel connectors will also work if you have an old case. Last is a RCA phono jack. Most electronic parts stores should have this. Shielded wires aren't needed for this as the run is short and there is a ground wire within the cable. Otherwise with individual wires, twist the wires together. Since the signal is digital, it's mostly immune to RF interference.

    Click image for larger version

Name:	01.JPG
Views:	21435
Size:	28.3 KB
ID:	6356


    What the MB S/PDIF connector looks like.

    Click image for larger version

Name:	02.JPG
Views:	31552
Size:	44.5 KB
ID:	6357


    The backplane insert drilled with a 1/4" hole.

    Click image for larger version

Name:	03.JPG
Views:	26840
Size:	24.1 KB
ID:	6358


    The RCA phono jack attached. Bend up the ground tab a bit before tightening the jack and it's easier to access for soldering. I also used a lockwasher to keep it from loosening, but not required.

    Click image for larger version

Name:	04.JPG
Views:	19639
Size:	19.9 KB
ID:	6359


    The CD cable and connectors. I cut one end off at the connector and cut the white wire off on both ends. If you use a safety pin, you can gently lift the plastic retainer flap and pull out the connector pins to arrange them to your motherboard connector. Try not to stab your finger.

    Click image for larger version

Name:	05.JPG
Views:	26761
Size:	16.1 KB
ID:	6360


    Two pins removed and one to go. As mentioned, I will cut off the white wire and connector.

    Click image for larger version

Name:	06.JPG
Views:	19371
Size:	20.6 KB
ID:	6361


    The connector pins plugged into the correct sockets. They just slide in and the plastic retainer should hold them. Make sure they are oriented the same was as when they were removed.

    Name:  07.JPG
Views: 41187
Size:  6.0 KB


    The backplane ready to solder to. I removed about a 1/8" insulation on both wires and tinned them with solder.

    Click image for larger version

Name:	08.JPG
Views:	19368
Size:	14.8 KB
ID:	6363


    The wires soldered to the RCA jack. I also used a bit of hot glue to hold the wires in place so they are less likely to break if moved around a lot.

    Click image for larger version

Name:	09.JPG
Views:	19968
Size:	29.9 KB
ID:	6365


    The connector plugged into the S/PDIF MB connector and ready to go.

    Click image for larger version

Name:	10.JPG
Views:	27011
Size:	41.5 KB
ID:	6366
    Last edited by redwudz; 6th Apr 2011 at 16:48.
    Quote Quote  
  2. Member
    Join Date
    Dec 2013
    Location
    Australia
    Search PM
    Great work, where could I possibly buy this?
    Quote Quote  
  3. Member
    Join Date
    Aug 2006
    Location
    United States
    Search Comp PM
    Originally Posted by deltron_fetus View Post
    Great work, where could I possibly buy this?
    Look for "SPDIF Optical and RCA Out Plate Cable Bracket" on Amazon.com.au or ebay.com.au

    This is a Gigabyte version
    http://www.ebay.com.au/itm/Gigabyte-12CR1-1SPOUT-12-SPDIF-Optical-Output-Audio-Cable-K...9341013&_uhb=1
    Quote Quote  
  4. Member
    Join Date
    Dec 2013
    Location
    Australia
    Search PM
    thanks for your help, I was missing a couple of key words in ebay search!
    Quote Quote  
  5. Mod Neophyte Super Moderator redwudz's Avatar
    Join Date
    Sep 2002
    Location
    USA
    Search Comp PM
    I'm still using this home-made S/PDIF adapter with my latest motherboard. The MB has a optical output, but no coaxial and my audio switcher needs a coaxial input. Most motherboards do still have a S/PDIF header.
    Quote Quote  
  6. great, but what and how should I do it if I want an S/PDIF input instead of output? My MB has three pins on motherboard Power, SPDIFI and Ground. What should I solder to the RCS connector?
    Quote Quote  
  7. Mod Neophyte Super Moderator redwudz's Avatar
    Join Date
    Sep 2002
    Location
    USA
    Search Comp PM
    Motherboards that have a S/PDIF in will list it in the motherboard manual. If they don't, not much chance of connecting to it, even if there are solder pads on the motherboard. The BIOS and correct drivers would have to be installed, and that's not likely if there aren't headers.

    And welcome to our forums. There may be some way to add a S/PDIF input (Digital input) to a PC, but others here would have to make a suggestion.

    A few of my older MBs do have a S/PDIF in header, but it's not common. This is what a S/DIF header looks like on one of my MBs.
    The 5VDC on the connector is to run a optical (IR Diode) output for optical out, usually TosLink :
    Image Attached Thumbnails Click image for larger version

Name:	SPDIF.JPG
Views:	4844
Size:	85.6 KB
ID:	29886  

    Last edited by redwudz; 24th Jan 2015 at 18:52.
    Quote Quote  
  8. The bump up on this thread was very timely for me, as the optical out on my Asus mobo died just today.

    I'd forgotten there was an adapter like this:

    http://www.amazon.com/SPDIF-RCA-Plate-Cable-Bracket/dp/B0035J9Z7W

    I checked the pin-outs on my mobo and it looks like the above will do the trick without modification. I could have made one (and used coax instead of optical) using this excellent guide, as I have a soldering iron (2 actually), blank plates, and spare CD audio cables. All I am missing is the RCA jack. Too lazy to do it though when I can get one for a measly $13 bucks.

    Thanks redwudz.
    Pull! Bang! Darn!
    Quote Quote  
  9. Mod Neophyte Super Moderator redwudz's Avatar
    Join Date
    Sep 2002
    Location
    USA
    Search Comp PM
    That particular circuit board is somewhat universal to most motherboard S/PDIF output connectors. You just need the 5VDC feed and the S/PDIF out connection on the MB. The coaxial and optical outputs on the motherboard are the same specifications, the optical is just converted to light via a infrared diode.
    Quote Quote  
  10. can i do one by cutting an old composite video cable and 2 breadboard wires?

    I am sure the breadboard wires will fit because i've already used them to wire a speaker, but i am not sure about the composite cable...
    Quote Quote  
  11. Mod Neophyte Super Moderator redwudz's Avatar
    Join Date
    Sep 2002
    Location
    USA
    Search Comp PM
    Most all PC motherboards use standard industry .1" spaced connections for S/PDIF and other similar connections, so yes, those would work. I got my wires from a junked computer.

    Since the signal is digital and inside the computer, you don't really need a shielded cable, but I would twist the two leads together just to reduce the chance of interference and to make them look tidy. The wires I used for my adapter were not coaxial or shielded.
    Quote Quote  
  12. I went ahead and made one just like in the guide, while waiting for my mobo warranty replacement. (Other things started to go haywire on the mobo as well).

    Works like a charm on the new mobo. I never bothered to put in the spdif adapter I ordered from Amazon.

    Finally some vindication for saving stuff like backplate inserts and CD cables, etc, from junked computers!

    Thanks again.
    Pull! Bang! Darn!
    Quote Quote  
  13. Member ahhaa's Avatar
    Join Date
    Feb 2005
    Location
    Michigan USA
    Search Comp PM
    I'm still looking at your motherboard and drooling..:]
    Quote Quote  



Similar Threads