Hey 555,
Thank you so much for posting, was actually hoping you would.
I posted a few screencaps of the schematic at the Yahoo address where I'd posted a few pics of the mod itself:
http://photos.yahoo.com/davidp01503 Hopefully these are legible enough; thought larger zooms would be too unwieldy.
Given that several folks have performed this mod with success, I assume that for my unit, there is a cap or other discrete that's a little less than spec, as you mentioned. However, I think your email points to that one final tweak needed to make this mod rock solid. There is a slight change in gain if I understand the dynamics, one that my particular unit is having difficulty with on some passages, or maybe it is with songs that have higher initial recording levels. On a solid unit, I think your suggestion would further improve the already much-improved performance.
Amen on the extra coupling caps!!! I've been studying the concept of stacked DACS and searching where I can. In the original thread at DIYAudio, there was question and mention of extra caps being needed due to voltage changes. I was trying to compose an email to pose this exact darn question, so your post is very timely.
If interested, my thread that details the mod itself is located at
http://www4.head-fi.org/forums/showt...282#post667282
To answer your question, no discretes were added at the new chip's location. Larger caps were added at the PS, with one bypass cap. I just need to know what and where to solder…8~)
Thanks again, I would appreciate any thoughts or suggestions.
Btw - I have a D555 on the way so will soon be joining the ranks. I just hope I never need any of the related info you've posted in this thread….. 8~)
Dave