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Audio Input Question (TRRS?)
#1
Question 
Apparently the Tinker Board's 3.5 mm (1/8") audio jack is Tip-Ring-Ring-Sleeve (TRRS) to accommodate headset-mic combos.  I just need to pipe audio IN to the device.  The schematic is unclear (to me); is the input on Ring 2?  If not, which is the input?

I've been foolishly trying to send audio in via a standard TRS "aux" cable!

On a side note, I also tried a USB sound card with a dedicated line in (a "CM106 Like"); it works, but the audio is distorted and filled with crackly digital nastiness.  At least that's better than the cheapie USB dongles, from which I get...nothing.
Honoring Major Edwin Howard Armstrong daily through the avid use of his inventions.
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#2
Thumbs Up 
   
Well, it took a bit of experimenting, but I finally have audio going into the Tinker Board!  One of the challenges was, the TRRS plug I was working with had a case that was too wide for the plug to seat properly when the board was in its case.  A slim-line plug helped solve that problem; now I have a Tip-Ring-Sleeve (standard stereo "aux" cord) connector going through a short cable to the Tip-Ring-Ring-Sleeve the Tinker needs.  Since the Tinker Board can only take mono in, I ended up using just one channel.

So, now I have my Tinker Board working as an Icecast streaming client using Darkice.
Honoring Major Edwin Howard Armstrong daily through the avid use of his inventions.
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