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Old 23rd September 2006, 12:02 PM   #1
senderj is offline senderj  Hong Kong
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Default first try cd-rom + 1543 dac

Tried to use cd-rom drive plus a NOS 1543 dac to bulid cd player. The controller + cd-rom drive works find when use analog output. But when connect the SP/DIF to this 1543 dac

http://www.pbase.com/billyflorentino/image/19056296

the controller freeze with message "Looking for IDE". Disconnect the dac, the cd-rom driver plays normally. Any idea what's wrong?
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Old 23rd September 2006, 04:05 PM   #2
Leolabs is offline Leolabs  Malaysia
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Which kind of controller are you using???
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Old 24th September 2006, 01:35 AM   #3
senderj is offline senderj  Hong Kong
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This one:

http://www.cdream5.com/htm/PDF/CDC3_SCH_V5.rar
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Old 24th September 2006, 02:26 AM   #4
Leolabs is offline Leolabs  Malaysia
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Then which version of firmware are you using???
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Old 24th September 2006, 03:11 AM   #5
senderj is offline senderj  Hong Kong
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Version 3.2
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Old 25th September 2006, 02:23 AM   #6
Leolabs is offline Leolabs  Malaysia
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Never know there is such a problem.Have you try with other DACs???
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Old 25th September 2006, 06:21 AM   #7
MCLL is offline MCLL  Hong Kong
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What brand name CD-Rom you connect?

or

using other CD-Rom?
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Old 25th September 2006, 08:56 AM   #8
senderj is offline senderj  Hong Kong
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I don't have other dac to try.

I did further test on the dac with a dvd player's coax out. It didn't work also. From the link, it works with the author. And I also saw some similar schematic (same 75R at input, using 8412 or 8414 with 1543, different output RC network) DAC on other web sites and the authors also have success. I've check my connection over and over again and didn't spot anything wrong. What is the most likely area where I made msitake? What would you check first if you are in such situation? Please help.
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Old 25th September 2006, 10:26 AM   #9
PetrL is offline PetrL  Czech Republic
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"same 75R at input"

The CD-rom has TTL output level, so no 75R in parallel! Just leave it out.

By the way, soundwise, using CD-rom's digital out is waste of time (I wasted it already).
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Old 25th September 2006, 10:27 AM   #10
MCLL is offline MCLL  Hong Kong
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I have build a DAC also using CS8414 & AD1852 connect to my CD-Rom Player. No any error found. And then, Try to connect dvd-player and no any error found.
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