DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 239 - diyAudio
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Old 22nd January 2013, 07:11 AM   #2381
gopib is offline gopib  India
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Where is the optical input on the board...am I missing something???
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Old 22nd January 2013, 07:23 AM   #2382
atupi is offline atupi  Romania
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There is no optical input on the kit but you can add one if you want.
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Old 22nd January 2013, 03:59 PM   #2383
atupi is offline atupi  Romania
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I want to share my results in testing some good opamps:

OPA 827- sounds good but laks details a bit
LME49720- sounds really good, a lot of details becomes fatigueing
OPA1642-full bodied, really well balanced-my choice

Back to my DAC for more tests
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Last edited by atupi; 22nd January 2013 at 04:02 PM.
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Old 22nd January 2013, 06:28 PM   #2384
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Quote:
Originally Posted by atupi View Post
I want to thank to Dario and the others for a well documented BOM and mods.
You're welcome

Quote:
Originally Posted by atupi View Post
OPA 827- sounds good but laks details a bit
LME49720- sounds really good, a lot of details becomes fatigueing
OPA1642-full bodied, really well balanced-my choice
Strange, in my setup OPA1642 if quite less detailed and full than OPA827...
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Old 23rd January 2013, 05:45 PM   #2385
atupi is offline atupi  Romania
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Default PLL filter mod

Reading carrefully CS8416 datasheet chapter 18.2.3 "Circuit Board Layout" recommendations regarding PLL filter today i have changed the three components with the recommended ones.
Also the Va pin was recommended to be decoupled closely to the CS8416 pin i have installed a 0.1 uf smd on the backside of pcb
These changes has been recommended for best jitter levels.

The results where obvious: more details on quiet passages, more voice presence.

I've added also for decoupling the two rails of opamp one 100nf quality film caps on every rail paraleled with the recommended elco's. I've seen this recommendation on every opamp datasheet.
Attached Images
File Type: jpg PLL ilter 3.JPG (55.6 KB, 567 views)
File Type: jpg PLL filter 1.JPG (27.4 KB, 552 views)
File Type: jpg PLL filter 2.JPG (154.1 KB, 545 views)
File Type: jpg Va filtering.jpg (75.8 KB, 540 views)
File Type: jpg PLL filter datasheet capture.JPG (65.2 KB, 527 views)
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Last edited by atupi; 23rd January 2013 at 05:49 PM.
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Old 23rd January 2013, 11:20 PM   #2386
tofurky is offline tofurky  United States
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hey,
i am going to build one of these based on bare pcb using the "full bom" google doc as a guide.
i like to try to get things from as few sources as possible, and mouser doesnt have a direct match for a couple parts.
C29,C24 are specified as 647-UFW1J470MED (nichion fw), but only 647-UKW1J470MED (nichion kw) is in stock
C5 is specified as Wima FKS2 22nF 50v, closest match is 505-MKS20.022/63/5 (Wima MKFS2 63V .022uF 5% 5mm)
C6,C8,C9,C21 is specified as Evox-Rifa SMR 100nF 50v, closest match is 80-SMR5104K100J03L4 (Kemet 100volts 0.10uF 5% 5mm)
any good mouser-sourced substitutes for C32,C33,C35 (Cerafine 10 uF 50V) and C38,C39 (Silmic II 100 uF 50V)? can i use all cerafine in place of the silmic?
thanks,
-matt
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Old 24th January 2013, 12:08 AM   #2387
tofurky is offline tofurky  United States
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sorry if i wasn't clear, i'm wondering if those substitutions i came up with are appropriate.
also, i don't see what the spacing of the screw terminals is for ac/output/spdif in. any recommendations/mfg # here are appreciated.
-matt
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Old 24th January 2013, 06:18 AM   #2388
atupi is offline atupi  Romania
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For C24,29 i propose 647-UFG1H470MPM
Having in mind the purpose of C5 and C36 i propose to choose some ceramic caps.
like 80-C315C102G1G and 81-RDED72W223K2M1C1A
Instead of Evox Rifa 100nf i propose: 75-MKP1837410161F and instead of cerafines and silmics you can use Nichicons KZ.

All my proposals are to stick to mouser list.

PS. I hope Dario is not angry on me that i'm changing his BOM proposal
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Last edited by atupi; 24th January 2013 at 06:26 AM.
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Old 24th January 2013, 12:44 PM   #2389
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@Tofurkey
Be sure to check by the component value, not just the exact number on the BOM. I was able to find several of the "out of stock" components, I.e no stock on a capacitor in bulk packaging, but available in tape reel... Same capacitor, different package.
Hope that helps. Also check the status, some parts may be available with a very short wait.
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Old 24th January 2013, 10:41 PM   #2390
tofurky is offline tofurky  United States
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thanks for the suggestions. still not sure about the screw terminals pitch though. standard .1" spacing? 5mm?
i read through dozens of pages of the thread and did some searches, but i did not see a clear reason why a 15v/9v r-core is suggested. 9v to a 9v regulator with a 1.3v dropout voltage? is this because with a small load, the transformer will actually output something significantly higher, like 12v or so?
i just bought this one: 30VA 30W R-Core Transformer 15V*2 9V*2 For DAC Preamp
and i read that even though PR9372 2.2kohm is on the BOM, 2.4kohm is actually the correct value?
thanks,
-matt
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