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Old 1st September 2012, 06:37 PM   #11
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Join Date: Mar 2012
Buy for 20-30$ a DAC converter DAC2496 (do a search on e-bay). If you have the space built in into the CD player, and enjoy. The DAC chip is of a technology which is way better than your Sony was made.
So you not only solve the problem of no sound, but you will improve it too.

Of you do not have enough space, the Chinese (on e-bay) sell also a ready made external cabinet with power supply and in / outputs.

That one can be used for several other digital sources too.
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Old 7th September 2012, 09:53 AM   #12
Preamp is offline Preamp  Germany
Islander
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Join Date: Jul 2008
Location: North Sea
OK, so here's what I did:
I salvaged a PCM1725 from an old satellite receiver and glued it on top of the CXD2552. I connected BCK, LRCK, LDATA, Vcc, GND, put 10uF from CAP to GND as the datasheet recommends, nailed DM and FORMAT to GND and connected SCKI to Pin 8 of IC603, which has 16,9344MHz or 384fs clock.
The good thing is: this actually works. At least a bit . The DAC puts out the music, but quite a lot of noise, too. That's the bad thing...
The clock I took from the buffer is actually a sine wave, which, I guess, is not what the DAC wants to see. Unfortunately it needs either 256fs or 384fs, but the CXD2552 only gives me 128 and 512 .
The question is, might the noisy output be due to the "sinewave clock"? I tried the 128fs from the CXD, but the DAC remained silent. I also tried to get the audio data from Pin 13 of IC202, which gives basically the same results.
With a 2x divider I could get my 256fs from the 512fs, but will this be worth the effort?
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Old 9th October 2012, 03:46 PM   #13
Preamp is offline Preamp  Germany
Islander
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Join Date: Jul 2008
Location: North Sea
I tried a 74AC14 Schmitt-Trigger to "rectify" the clock signal, but to no extent . Guess I'll have to use an external DAC now, like haik suggested.
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Old 10th October 2012, 10:43 AM   #14
Preamp is offline Preamp  Germany
Islander
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Join Date: Jul 2008
Location: North Sea
Dang! I should have tried this earlier: Taking all three signals (BCK, LRCK, LDATA) directly from the DSP, skipping the digital filter chip, works like a charm ! Even without the 7414. I reconfigured the I/V-Converter to a simple buffer for each channel. Maybe not the most High-End solution, but at least I don't have to scrap the player now .
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