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-   -   cs8414 & wm8740 dac (one dac chip) (http://www.diyaudio.com/forums/digital-line-level/148340-cs8414-wm8740-dac-one-dac-chip.html)

sparkle 31st July 2009 07:26 AM

cs8414 & wm8740 dac (one dac chip)
 
2 Attachment(s)
Hi guys,
i am working slowly on a dac mostly based on "Opus" DAC that should use CS8414 input receiver and WM8740 dac chip in stereo mode...
Output of the dac should use 6n6p tube connected as cathode follower...
The idea is to use the parts i allready have at my home from the previous projects (to make it cheaper) and also to make it nice and smiple but also to sound really good... It should run in 16 bit or 24bit mode (which we can selec on the dac chip)...

First sch of the dac is attached in this post and it is not finished - the tube section is not there - i still am considering how to do it since i would not like to use opamps to convert singal to unbalanced (and yes - i would like to have it simple and to use both outputs - ballanced and unbalanced)...so - any ideas for the solution are welcome... and also any comments related the first schematic of the dac....
thnx...
many regards
daniel

sparkle 31st July 2009 07:36 AM

2 Attachment(s)
the pcb under development is here - this is not finished but more a version on which i am working on...still needs a lot of work to be done - comments are also welcome ... ideas too :D

sparkle 31st July 2009 07:37 AM

2 Attachment(s)
also pcb without parts...
it is not finished - it is only here so that i get some clever comments during the development....
thnx :D

binspaul 31st July 2009 08:50 AM

Hi Sparkle,

1. Is it possible to use a TI chip DIR9001 instead of the CS 8414 chip ? What all needs to be modified in the diagram ?

Best regards,
Bins.

sparkle 31st July 2009 09:04 AM

i will not use DIR9001 because i allready have CS8414 at home (from previous projects)...
i never worked with DIR9001 so i do not know what needs to be modified - but maybe this link will help you...
http://alexchiangaudio.com/bbs/viewthread.php?tid=8

sparkle 31st July 2009 09:06 AM

question - where is the best spot to connect analog ground and digital ground... the easiest would be to connect digital ground near the digital input with the analog ground near the output from the dac...

sparkle 31st July 2009 09:27 AM

i would be really happy if someone could confirm to me that this schematic is o.k. and that pcb is looking so far like it should be o.k. to use and naswer the question related grounding....
thnx...
should i maybe disconnect digital ground from analog???

sparkle 6th August 2009 05:23 AM

sad to see that nobody can/ or will, confirm this....

:(

jean-paul 6th August 2009 06:09 AM

That is probably due to the obsolete CS8414 you decided to use. CS8416 (or the DIR) is a better choice. Also a tube or opamp stage is not really needed as the DAC chip can be used passively without further active components. Adding a tube stage will only add distortion and there is no reason for doing so unless you like distortion.

So essentially Opus is:

- more simple ( when you take the tube stage in account )
- it has a more modern receiver with lower jitter sensitivity
- equipped with onboard regs close to the chips !!
- accompanied by a suitable power supply
- equipped with a passive output stage
- thoroughly tested and a proven design
- enhanced by using WM8741
- a very good sounding DAC
- reasonably priced

To surpass that level will be difficult !


sparkle 7th August 2009 04:42 AM

jean-paul - good to see you here in this thread....
thnx for the answer....
...
i do not want to surpass the quality of OPUS dac...
i only want to build the dac for myself that will use the parts that i have in my junk box and that will (in that matter) be also cheap (because of the parts i allready have).....

so i am stuck with CS8414 and WM8740... that is why i decided to use those two:)
and since i am not that good in digital audio i simply would like that somebody checks the sch so that i can be sure that this will work and at least work good.... that is my only goal here....
the tube stage is less important here for now...
pcb is also less important - no need to check it unless somebody can see a major problem on it - maybe related the grounds or something........
o.k... thnx again for answering .....


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