DIY CD drive based on a computer CDROM

I got an problem;

i hear an digital sound looks like static sound when connected the
digital output to an DAC i have convert the SPdif TTL to COAX
does anyone knows this problem

I have just connected CD-Rom Digital Out to DAC and NO any problem
 

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All I can suggest is to try a different drive.
Or, give up and buy a DVD or Blu-ray player from a thrift store. Those all have S/PDIF outputs, which I seem to remember was one of the main motivation for turning CDROM drives into audio players. Newer players tend not to have front-panel displays, though. Some of the no-name models have undocumented support for DVD-Audio.