🚀 go-pugleaf

Kit-pui Wong wrote in message <768io3$ogr$1@justice.csc.cuhk.edu.hk>...
>Hello,
>
>I recently bought a Denon DA-500 DAC from the 2nd hand market
>and want to do some "experiments" with it.
>However, I have no budget for an (expensive) CD transport.
>
>Is there any expert here having experience to "extract" the
>digital audio signal from cheap CD players/or CD-ROM drives ?
>I know a little bit electronics. Where can I get the resources,
>such as "typical" circuits, chips references, etc.
>


I've never done this, but depending on the player, it might be doable. What
you need is to find a signal line(s) in the player that has a SP/DIF or I2S
signal. There are chips that will handle that data and create a good SP/DIF or
TOSLink output from it.

So, having a service manual for the player that has a schematic in it would be
a good place to start. YOu can use it to find out where to find the internal
power and signals that you need for your project. Denon probably has a
national parts warehouse where you can order these things.

Even lacking that, if the Denon has standard DAC chips in it, then you can
find a lot of what you need from data sheets for those chips. For example, my
Denon DAC has Burr-Brown 1702 DAC's in it. If you go to the B-B web site you
can download PDF files that are data sheets for those DAC's, and find out what
pins have the apropriate digital signals on them.

For DAC chips and digital line drivers, the leading producers are Crystal
Semiconductor. Burr-Brown, AKM, and Analog Devices. They all have pretty
complete web sites you can find from a regular search engine using the company
name. AFAIK, they all have pretty complete data sheets and application notes.
You will probably be able to find application notes that show how to
interconnect their chips to do many digital audio applications.

In article <768io3$ogr$1@justice.csc.cuhk.edu.hk>,
  kpwong@psy.cuhk.edu.hk (Kit-pui Wong) wrote:
> Hello,
>
> I recently bought a Denon DA-500 DAC from the 2nd hand market
> and want to do some "experiments" with it.
> However, I have no budget for an (expensive) CD transport.
>
> Is there any expert here having experience to "extract" the
> digital audio signal from cheap CD players/or CD-ROM drives ?
> I know a little bit electronics. Where can I get the resources,
> such as "typical" circuits, chips references, etc.
>
> Thank you very much in advance!
>
This place has what you need!- http://www.PrecisionLaserdisc.com  They have
U-DO upgrade KITS for various applications: AC-3 and DTS and SPDIF.  Since you
can sling a iron, you should have no problem

Merry New Year!

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Thanks for your information.

The problem is that I don't have any schematic diagrams for
my CD Player / CD ROM drive. It's difficult to pin out which 
chip is responsible for DAC as I don't have a list of commonly
used DAC chips. Where can I find such a complete list of chips 
by different manufacturers ? (Crystal, Burr-Brown, AKM, Analog 
Devices (as you mentioned), and Philips (?) ... etc)  ?

Many thanks again!


: I've never done this, but depending on the player, it might be doable. What
: you need is to find a signal line(s) in the player that has a SP/DIF or I2S
: signal. There are chips that will handle that data and create a good SP/DIF or
: TOSLink output from it.

: So, having a service manual for the player that has a schematic in it would be
: a good place to start. YOu can use it to find out where to find the internal
: power and signals that you need for your project. Denon probably has a
: national parts warehouse where you can order these things.

: Even lacking that, if the Denon has standard DAC chips in it, then you can
: find a lot of what you need from data sheets for those chips. For example, my
: Denon DAC has Burr-Brown 1702 DAC's in it. If you go to the B-B web site you
: can download PDF files that are data sheets for those DAC's, and find out what
: pins have the apropriate digital signals on them.

: For DAC chips and digital line drivers, the leading producers are Crystal
: Semiconductor. Burr-Brown, AKM, and Analog Devices. They all have pretty
: complete web sites you can find from a regular search engine using the company
: name. AFAIK, they all have pretty complete data sheets and application notes.
: You will probably be able to find application notes that show how to
: interconnect their chips to do many digital audio applications.

Kit-pui Wong wrote in message <76ck32$hu0$1@justice.csc.cuhk.edu.hk>...
>Thanks for your information.
>
>The problem is that I don't have any schematic diagrams for
>my CD Player / CD ROM drive. It's difficult to pin out which
>chip is responsible for DAC as I don't have a list of commonly
>used DAC chips. Where can I find such a complete list of chips
>by different manufacturers ? (Crystal, Burr-Brown, AKM, Analog
>Devices (as you mentioned), and Philips (?) ... etc)  ?
>


Their web sites!

otis_thick@my-dejanews.com wrote in message
<76cc8h$cf$1@nnrp1.dejanews.com>...
>In article <768io3$ogr$1@justice.csc.cuhk.edu.hk>,
>  kpwong@psy.cuhk.edu.hk (Kit-pui Wong) wrote:
>> Hello,
>>
>> I recently bought a Denon DA-500 DAC from the 2nd hand market
>> and want to do some "experiments" with it.
>> However, I have no budget for an (expensive) CD transport.
>>
>> Is there any expert here having experience to "extract" the
>> digital audio signal from cheap CD players/or CD-ROM drives ?
>> I know a little bit electronics. Where can I get the resources,
>> such as "typical" circuits, chips references, etc.
>>
>> Thank you very much in advance!
>>
>This place has what you need!- http://www.PrecisionLaserdisc.com  They have
>U-DO upgrade KITS for various applications: AC-3 and DTS and SPDIF.  Since
you
>can sling a iron, you should have no problem
>


I read this site as carrying a device that adds an RF output to Laserdisk
players (not for CD players which use different technology), and another
device that adds a SP/DIF output to Laserdisk or CD players.

The kit costs $95 and the modification costs about twice that if you have them
do it. I think they make a profit... but not what I think is an excessive one.
But, the player you start with has to have some value for the economics to be
there, at these prices.

I was able to buy a Sony CD player with digital output for less than $100 as
B-stock (refurbished). There is also an Aiwa CD changer with digital output
that is carried as new stock by Best Buy and Circuit City for $129.

The "fun", "education", and "pride" that would come from sucessful completion
of this project of course, would be "priceless". The less you get
"prepackaged", the more of this you'd get...

: >This place has what you need!- http://www.PrecisionLaserdisc.com  They have

Thank you!

: >U-DO upgrade KITS for various applications: AC-3 and DTS and SPDIF.  Since
: you
: >can sling a iron, you should have no problem
: >

Maybe .... :-)

: I read this site as carrying a device that adds an RF output to Laserdisk
: players (not for CD players which use different technology), and another
: device that adds a SP/DIF output to Laserdisk or CD players.

: The kit costs $95 and the modification costs about twice that if you have them
: do it. I think they make a profit... but not what I think is an excessive one.
: But, the player you start with has to have some value for the economics to be
: there, at these prices.

: I was able to buy a Sony CD player with digital output for less than $100 as
: B-stock (refurbished). There is also an Aiwa CD changer with digital output
: that is carried as new stock by Best Buy and Circuit City for $129.

: The "fun", "education", and "pride" that would come from sucessful completion
: of this project of course, would be "priceless". The less you get
: "prepackaged", the more of this you'd get...

Exactly !    :-)

Is this different from the 'digital audio' out on the back of a lot of
CD-ROM drives?  I have a Mitsumi that has digital out.  And my
son just toasted an old 2x CD-ROM in his PC, so my brother
bought him a new 32x (the cheapest thing available anymore!)
and it has pins on the back labeled 'digital audio out'.

Mike Yetsko



otis_thick@my-dejanews.com wrote in message
<76cc8h$cf$1@nnrp1.dejanews.com>...
>In article <768io3$ogr$1@justice.csc.cuhk.edu.hk>,
>  kpwong@psy.cuhk.edu.hk (Kit-pui Wong) wrote:
>> Is there any expert here having experience to "extract" the
>> digital audio signal from cheap CD players/or CD-ROM drives ?
>> I know a little bit electronics. Where can I get the resources,
>> such as "typical" circuits, chips references, etc.
>>
>This place has what you need!- http://www.PrecisionLaserdisc.com  They have
>U-DO upgrade KITS for various applications: AC-3 and DTS and SPDIF.