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Old 18th May 2013, 12:22 PM   #1
kvaal is offline kvaal  Norway
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Default Make DAC of old CDP.

I have a old Rotel RCD 855 CDP. The cd-drive is out of order. I love the sound of this old machine, and I want to remove the cd-drive, with electronics and make it into a DAC.

Do anyone know how to do this?
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Old 19th May 2013, 04:01 PM   #2
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Default Old CD player dac

Hi kvaal, I can't see why not. You will need an input receiver chip/ board. The output of which will feed the digital filter. What chip set is in the Rotel? I'm looking at a WM8804 board from Twisted Pear Audio for my next build. Dave
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Old 19th May 2013, 04:20 PM   #3
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Hi kvaal, Looks like it is a TDA1541A S1 machine. It's a good machine to save. When my Magnavox CDB650's laser failed, I went with an Analogmetric TDA1541A board. Sadly it is not a great dac as designed. I did get it to sing better than the 650 with a lot of effort. First step I think is to look at the WM8804 datasheet. Make sure you can get I2S. I know the Twisted Pear WM8804 transciever will do I2S 24 bit. I2S 16 bit? Not sure. There are 2 benefits with that board. Jitter reduction and it gives you a SPDIF out besides the signals for the digital filter that you will need. You could steal power inside the Rotel to power the board too. I actually have 2 of the Analogmetric boards up and singing. Both have S1 Crown dacs. I use different analog stages. If you interested in that I can tell you more. Your stated project is worth doing. You might consider a CS8414 like circuit and use a DIR9001 adapter board. When I tested it it worked with I2S 24 bit. I prefer a different digital filter over the SAA7220. I get the needed 2's complement right justified data from the adapter board. Just a few ideas. Cheers, Dave
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Old 20th May 2013, 08:18 AM   #4
kvaal is offline kvaal  Norway
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How great to get an answer! Thank you! It is not many of us thinking in this way!

I am a novice in digital technology, but have some experience with the analog. I had a look at Twisted Pear Audio, for the 8804, but I don`t understand that much. Is it so that the SAA filter only accepts 16 bit? It doesnt matter much to me, I think, as I use AAC files. It may be a problem some time in the future.

Native 24bit 96K USB to SPDIF I2S Converter Module DAC | eBay

I found this on ebay. May be a solution?

For the time I am using an old Philips CDP with TDA 1541a. I have tweaked the analog section, removed the mute transistors, Sanyo OS-CON and the op-amp is AD 827. It plays much better than anything else I have heard. It is seduction!
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Old 21st May 2013, 01:49 AM   #5
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Hi kvaal, Looks like that will get you USB to I2S. Maybe someone can chime in here about what the SAA7220 thinks of 24 bit 96 Khz data? It might ignore the extra bits. I know the TDA1541A in NOS is supposed to work up to 16 bits and ignores the other bits. Wish I had an answer for you. Anyone know? Dave
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Old 21st May 2013, 12:01 PM   #6
kvaal is offline kvaal  Norway
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Ok. I`m interested in sp/dif input. I may use the cs 8412 or cs 8414.

What about this board?

DIR9001 Converter PCB CS8412 CS8414 Upgrade Replacement | eBay
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Old 29th May 2013, 09:22 PM   #7
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Smile DIR9001

Quote:
Originally Posted by kvaal View Post
Ok. I`m interested in sp/dif input. I may use the cs 8412 or cs 8414.

What about this board?

DIR9001 Converter PCB CS8412 CS8414 Upgrade Replacement | eBay
Hi kvaal, I tried the link and it went nowhere. I have (2) DIR9001 to CS8412/8414 adapters from ebay. I purchased from RaindropHui. They do work. I use mine to send "2's complement, right justified, MSB first" to a NPC SM5814. It is a superior digital filter to the SAA7220. It features 18 bit coefficients and the 7220 can't make that claim. If you want to keep the 7220 it will do I2S. I have ran that into the 7220. Don't know what it does with 24 bits.... I just remember it plays. I preferred the 5814. I have data for the 5814 and a source if you ever want to try that just PM me. I have heard some complaints about Raindrop's dac's however the adapter works just fine. Hope that helps, Dave
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Old 29th May 2013, 09:22 PM   #8
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Kvaal, I didn't get a note from the Forums. Forgive my late reply. Dave
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Old 30th May 2013, 05:15 PM   #9
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Default Dir9001 to CS8412/14

DIR9001 Digital Receiver CS8412 CS8414 Converter Board | eBay This is the board I use.
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Old 2nd June 2013, 07:49 PM   #10
kvaal is offline kvaal  Norway
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No harm for late replys. I`m late myself. Hope you don`t bother about that.

Thank you for the link. I will consider this one. Which voltage is needed?
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