Double CD player from CDROMS

marcus66 · 2nd January 2004, 05:50 PM

I assume that this forum is the correct place for discussing homebrew CD players using a microcontroller/CDROM drive combination.
I have done a webpage about a project aimed at adding a little more features to such a setup:

http://www.astro.uu.se/~marcus/private/mcd1.html

Note that this is still only a partial project description, since it is not complete. However, it may be of interest to someone. I am particularly curious to see if someone else has built something similar.

Best wishes,

Marcus

dhaen · 2nd January 2004, 06:03 PM

Hi Marcus,

Your web description is impressive

I'm not into disco, but I have been following this thread:
DIY CD drive based on a computer CDROM which may interest you.
That is, of course, if you're not ahead of the game already

MCLL · 3rd January 2004, 12:46 AM

My Previous DIY DAC

http://hk.geocities.com/leo8597/

But Chinese Only...

Using Web Translate...
http://babelfish.altavista.com/

marcus66 · 4th January 2004, 01:21 PM

Thanks for the links!

In the thread with number 17910 I see a couple of people
mentioning a point that I'm wondering about in particular -
Is there some convenient way of altering the
pitch of audio playback on a CDROM drive?
I did not see any responses to this in the thread.

I have seen some hint in the IDE CDROM
specification that the number of audio frames per second may be
an adjustable parameter, but on my Samsung drives this value
was masked as read-only (E version, did not check AE version).

An interesting experiment would be to inject a signal from a
frequency synthesizer in place of the 33.8 MHz master
oscillator in the drive. However, that would probably not be
more than just an experiment.
If, on the other hand, the drive would still operate properly
at + or - 10% clock rate, it could be an interesting continuation
of the project.

Marcus

Lupulroz · 4th January 2004, 08:44 PM

When injecting clock in a NEC cd-rom drive I managed to hear sound at 1/2 speed, I think. Maybe if you install a DDS it will work fine.

2nd January 2004, 05:50 PM	#1
marcus66 diyAudio Member Join Date: Aug 2002 Location: Uppsala, Sweden	Double CD player from CDROMS I assume that this forum is the correct place for discussing homebrew CD players using a microcontroller/CDROM drive combination. I have done a webpage about a project aimed at adding a little more features to such a setup: http://www.astro.uu.se/~marcus/private/mcd1.html Note that this is still only a partial project description, since it is not complete. However, it may be of interest to someone. I am particularly curious to see if someone else has built something similar. Best wishes, Marcus

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2nd January 2004, 06:03 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Hi Marcus, Your web description is impressive I'm not into disco, but I have been following this thread: DIY CD drive based on a computer CDROM which may interest you. That is, of course, if you're not ahead of the game already

3rd January 2004, 12:46 AM	#3
MCLL diyAudio Member Join Date: Dec 2002 Location: Hong Kong	My Previous DIY DAC http://hk.geocities.com/leo8597/ But Chinese Only... Using Web Translate... http://babelfish.altavista.com/

4th January 2004, 01:21 PM	#4
marcus66 diyAudio Member Join Date: Aug 2002 Location: Uppsala, Sweden	Thanks for the links! In the thread with number 17910 I see a couple of people mentioning a point that I'm wondering about in particular - Is there some convenient way of altering the pitch of audio playback on a CDROM drive? I did not see any responses to this in the thread. I have seen some hint in the IDE CDROM specification that the number of audio frames per second may be an adjustable parameter, but on my Samsung drives this value was masked as read-only (E version, did not check AE version). An interesting experiment would be to inject a signal from a frequency synthesizer in place of the 33.8 MHz master oscillator in the drive. However, that would probably not be more than just an experiment. If, on the other hand, the drive would still operate properly at + or - 10% clock rate, it could be an interesting continuation of the project. Marcus

4th January 2004, 08:44 PM	#5
Lupulroz diyAudio Member Join Date: Apr 2003 Location: Iasi	When injecting clock in a NEC cd-rom drive I managed to hear sound at 1/2 speed, I think. Maybe if you install a DDS it will work fine.

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