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 Post subject: Adding digital Outs to Pioneer SP-99D
PostPosted: 12 Apr 2025, 19:41 
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Hi all,

I've seen a number of different places where people add optical / toslink /spdif to any number of devices much like this one:
https://www.youtube.com/watch?v=Q9oDw9C0QPA

Id like to have outs for both Toslink and digital Coax.

I swear i've seen someone use something like the device is photos posted here:
Does anyone have a link to one of these?
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Im thinking of removing the optical In, running what would normally go to an optical socket like in the video, then running 5 volt in through the micro usb 5v in and cutting holes and mounting to the back.
Would this work / has anyone done this?
Any guidance/gotchas/things to look out for?
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 Post subject: Re: Adding digital Outs to Pioneer SP-99D
PostPosted: 13 Apr 2025, 00:32 
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Adding a coaxial output requires more buffering from what I can tell vs just adding a Toslink out.

I used this board awhile back when I modded my CLD-M90 for both types of digital outputs and it worked great.....

Image

Unfortunately, I can't seem to find these anymore and the only one's available are either a version that also adds an XLR out or a version that takes in an I2S input that I will confirm right now would not work (and it would be overly complicated to integrate).

In respect to your idea, not sure that would work. The output from the chip on the Pioneer processor is electrical in nature so you would need to use the coaxial form of transmission which still needs some kind of buffering. I would say it's not worth doing as you are over complicating it and in reality the difference between Toslink and Coax really isn't distinguishable.


Going back to to the modder for the Pioneer, his idea works great but I would add a 0.1uf cap between the +5vdc & GND as well as a 75 ohm resistor between the digital out of the IC and the digital in on the Toslink transmitter for more protection.
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