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Old 29th April 2010, 08:39 AM   #1
iMac is offline iMac  Sweden
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Default Tweaking a DAC with CS8420 and CS4397

I have a Electrocompaniet ECD-1 and thinking of to do some tweking on it.. Have read some less good things about the CS8420..

Maybe bypass the SRC or changing PLL filter value, they are not like Crystals optimization! Rfilt=1,8KΩ, Cfilt=0,47uF and Crip=8,2nF
Or simply rip of the CS8420 and use CS8427 instead?

And the CS4397, have read about a mod of the CM out, pin 25. It's to put a 1KΩ to +5VA and a 1KΩ to AGND.

I have done some updating of caps and put chip caps close to the CSxxxx V in. I think it did some use to the sound, clearer and more space. But it could be the placebo effect..
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Old 3rd May 2010, 09:37 AM   #2
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Question Bypassing SRC

Have test to bypassing the SRC by lifting pin 27 "DFC1" (HW mod 1 -> 4), the output fq change from 96 to 44.1kHz but no sound..

Do I need to change the master clock from 24.576MHz to 22.5792MHz for the CS4397 to work with 44.1kHz?

Datasheet:
http://www.cirrus.com/en/pubs/proDat.../CS8420_F4.pdf
http://www.cirrus.com/en/pubs/proDat.../CS4397_F1.pdf
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Old 7th May 2010, 07:23 AM   #3
iMac is offline iMac  Sweden
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Question Wrong forum?

135 views and no replays, maybe I'm on the wrong forum!?

Any tip of a forum there I may get help is appreciated!
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Old 10th May 2010, 06:03 AM   #4
googe is offline googe  Finland
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Quote:
Originally Posted by iMac View Post
135 views and no replays, maybe I'm on the wrong forum!?

Any tip of a forum there I may get help is appreciated!
Hi,

I have no input on the modding but I would think that your DAC is not so widely known nor used?

Put some inside pictures of your device and I would guess this could induce more interest on this thread?

I have Abrahamsen V6.0 which should be very similar?

Thread in a finnish forum with pics of my device
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Old 24th May 2010, 06:54 PM   #5
iMac is offline iMac  Sweden
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I thought the question was rather straightforward but I include a pic of the receiver and DA board and hope it will do it

I have a CS8416 now so I will start to do the change hopefully next weekend.. But I will do a test with 22.5792MHz crystal before the change so I know that the CS4397 will work with 44.1KHz in..

Anyway, the board is very similar to your Abrahamsen board!
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Old 26th May 2010, 12:58 PM   #6
googe is offline googe  Finland
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Quote:
Originally Posted by iMac View Post
Anyway, the board is very similar to your Abrahamsen board!
Only difference I see is the use of SMD parts and different vintage for the Cirrus Logic chips.

There is a sticker strategically placed on my board .

They have these in Elgiganten and you could pop in to see or hear if there are other differences?

Don't install CS8420. My DAC has crashed a couple of times but I understand there is a fix coming for the V6.0?
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Old 31st May 2010, 08:26 AM   #7
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Quote:
Don't install CS8420
The stock is CS8420 and I want to change it to an CS8416, but it will be some work, it's not completely pin compatible.. I wanted to do a try with bypass the SRC on the CS8420 but it wasn't just lifting pin 27 and change the crystal fq to 22.5792MHz..

Quote:
My DAC has crashed a couple of times but I understand there is a fix coming for the V6.0?
Could be a interesting solution! Maybe new board, or a piggyback reset circuit..
Were have you heard/read this?
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Old 1st June 2010, 05:34 AM   #8
googe is offline googe  Finland
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Quote:
Originally Posted by iMac View Post
The stock is CS8420 and I want to change it to an CS8416, but it will be some work, it's not completely pin compatible.. I wanted to do a try with bypass the SRC on the CS8420 but it wasn't just lifting pin 27 and change the crystal fq to 22.5792MHz..


Could be a interesting solution! Maybe new board, or a piggyback reset circuit..
Were have you heard/read this?
The solution might be a new replacement board?

I'll be back with more info - when I have something more to share.
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Old 3rd September 2010, 01:41 PM   #9
googe is offline googe  Finland
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Quote:
Originally Posted by iMac View Post
The stock is CS8420 and I want to change it to an CS8416, but it will be some work, it's not completely pin compatible.. I wanted to do a try with bypass the SRC on the CS8420 but it wasn't just lifting pin 27 and change the crystal fq to 22.5792MHz..


Could be a interesting solution! Maybe new board, or a piggyback reset circuit..
Were have you heard/read this?
Now it is official.

Abrahamsen has a bulletin on their web page that a board will be available to V6.0 owners with problems. The bulletin is on the "news" section. In order to find it and read it you'll have to scroll upwards on top of the news.

Abrahamsen Audio | H e a r i n g i s B e l i e v i n g

As is apparent from the date of my last post these things take a while .

Hopefully they will also sell these boards as an upgrade to others.
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Old 30th December 2010, 08:32 AM   #10
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Default Adapter

Quote:
Now it is official.

Abrahamsen has a bulletin on their web page that a board will be available to V6.0 owners with problems. The bulletin is on the "news" section. In order to find it and read it you'll have to scroll upwards on top of the news.
Have missed your post until now..

I don't find any "news" section on the Abrahmsen web page, is it still valid?

Have heard about an adapter for the CS8416 to fit on a CS8420 pin layout, is that true?
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