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Old 17th December 2012, 01:08 AM   #1
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Question From CD Player to DAC

Hi all,
I have a vintage sharp dx 111 cd player. The laser broke down and there is not replacement (in argentina at least).
I love this machine and I was wondering if is there any possibility to turn it into a DAC, by using all digital circuits adding a coaxial rca input.
Thank you!
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Old 20th December 2012, 08:37 AM   #2
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That possibly could be done, but not by simply adding a coaxial input. At least there has to be a conversion from S/PDIF (that's what you think to use, right?) to I2S, and from there you tap in the signal into the DAC portion of your CD player.

You should feed the folks here with pictures of the CD player's internals and give more information, DAC type etc.
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Old 20th December 2012, 10:34 AM   #3
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You need to know
- Clock speed used
- Chips used

How vintage is it? I had trouble with tda1540 as they don't use classic i2s formats /some weird pre-I2S thing/.
If it is less vintage than 1540, then i'd guess it uses something more compatible to i2s.

Then you have to select the SPDIF receiver to use.
For 384Fs of 192Fs clocks you have the dir9001, for 128Fs / 256Fs - WM8804/5.

Fs = 44100
Clock = 128/192/256/384/512 * Fs
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Old 20th December 2012, 02:48 PM   #4
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Attempting the modifications needed to convert your CD player in to DAC creates a high probability for disaster. You could purchase an S/PDIF input reciever module from one of several online DIY kit suppliers, but you would also need to perform surgery on the CD players printed circuit board to tap in to the digital audio signal and master clock lines at the proper points, for which you should have in hand a schematic of your player.

You likely will have fewer headaches and regrets if you instead keep searching for a usable replacement drive. The internet makes it easy to conduct a world-wide search for unusual items such as this.
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Old 21st December 2012, 12:01 AM   #5
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Hi all!
Thank you very much for all responses. It seems to be more than difficult (for me) to do it well. I will sech for more info and availability of chips and other stuff. Will keep you posted on new developments, and will bother you with some other questions as well. Thanks again.
Fernando
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