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Old 12th March 2012, 07:53 PM   #111
Turbon is offline Turbon  Sweden
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OK, here they come.

Hopefully they show up...

I can't se them. Well, actually I could :-) after submitting...

But anyway I can't figure out what you could find wrong in these pictures... They arn't of a quality where one could pinpoint anything from.

Now this was quite cool... I could take some closeups of your chosing with some lenses I have...

Brgds
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File Type: jpg DAC 002.jpg (748.2 KB, 272 views)
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Last edited by Turbon; 12th March 2012 at 08:08 PM.
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Old 12th March 2012, 08:45 PM   #112
TheGimp is offline TheGimp  United States
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Did you inspect the board closely before populating it? I found a short between traces on mine and removed it before I did any soldering.
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Old 12th March 2012, 08:49 PM   #113
Turbon is offline Turbon  Sweden
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Yes, I did. I noticed that many bypasses were not aligned and so forth... Not the top notch quality. Of course, I might have missed something. So TheGimp - yours is functioning?

Brgds
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Old 13th March 2012, 12:59 PM   #114
TheGimp is offline TheGimp  United States
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No, I still need to order the ICs. Hopefully I'll order them this week.
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Old 13th March 2012, 03:01 PM   #115
tassosk is offline tassosk  Greece
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I have also populated two boards from the first round, none of them functioned. After inspection, both had shorts on various points so it is not clear what is the status of the ICs. Did anyone manage to have a working board?

Last edited by tassosk; 13th March 2012 at 03:05 PM.
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Old 14th March 2012, 01:49 PM   #116
TheGimp is offline TheGimp  United States
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I'm getting ready to place my parts order and was wondering if a 10K load is necessary in place of the volume pot if the buffer is used, but not the headphone amp?

Replace the 47K (R28,R29) with 8.2K resistors?

What IC is used for the headphone amp?
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Old 14th March 2012, 05:43 PM   #117
TheGimp is offline TheGimp  United States
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Has anyone tried the Nichikon KA series?

http://www.nichicon.co.jp/english/pr...s/ka_web_e.pdf
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Old 14th March 2012, 06:18 PM   #118
qusp is offline qusp  Australia
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nope and when they promote it by saying things like this

Quote:
selected materials to create superior acoustic sound
without further detail; it kinda turns me off.

nichicon make some really great caps and at a reasonable price too, but the audio grade stuff seems to me to actually be lower quality for more money
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Old 15th March 2012, 08:08 PM   #119
TheGimp is offline TheGimp  United States
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Parts due in Friday. Mouser shipped the same day I ordered.

I got a link from EDN today to an interesting article for those of you (like me) trying to come up to speed on data conversion.

Audio converter subsystem design challenges in the 21st century - 2011-12-06 22:16:39 | EDN
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Old 15th March 2012, 11:01 PM   #120
tcpoint is offline tcpoint  United States
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I noticed some areas that I would reflow with the soldering iron. I have an arrow pointing at them. Hope that helps.
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