SPDIF Output from SAA7020, SAA7000 - Page 3 - diyAudio
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Old 25th November 2005, 05:53 PM   #21
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Thank you so much!!! hope i can hear the news from you
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Old 26th November 2005, 09:57 AM   #22
Zoran is offline Zoran  Serbia
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Hi
I think that somehoew
it is possibile...
But that beyond my knowlege in digital circuits...
so rfbrw
I am very interested about Your design

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Old 26th November 2005, 10:57 AM   #23
poynton is offline poynton  United Kingdom
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Hi,
An interesting topic!

Can I ask the question in a different way?

Is the reason for the original query that you have a cd player (which model?) that has a cdm-1 mechanism and you want to retain that and the original case as the basis for a cd-player with spdif output only?

I have also toyed with the idea of upgrading a Philips CD104 - a great player with cdm-1 mech and cast alloy chassis - to a 'better' output ie spdif, 16-bit TDA1541.

I came to the conclusion that the only realistic way of achieving this would be to scrap the 2 existing boards and to replace them with later boards, eg from a Philips CD150, and them modify the laser preamp board. This should not be too difficult as it is mainly mechanical and the connections from the laser, focus and tracking motors are similar.

Just a thought.

Andy
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Old 26th November 2005, 03:13 PM   #24
guido is offline guido  Netherlands
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Quote:
Originally posted by poynton
I have also toyed with the idea of upgrading a Philips CD104 - a great player with cdm-1 mech and cast alloy chassis - to a 'better' output ie spdif, 16-bit TDA1541.
The 1541 can be connected directly on this chipset, before the dig filter. No oversampling though.
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Old 26th November 2005, 03:37 PM   #25
Lourens is offline Lourens  Europe
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Quote:
Originally posted by poynton

I have also toyed with the idea of upgrading a Philips CD104 - a great player with cdm-1 mech and cast alloy chassis - to a 'better' output ie spdif, 16-bit TDA1541.
TDA1541 is a DAC, you mean SAA7220?
Using the 1541 in the SAA70x0 set, as Guido proposes, will not give us spdif output, will it?
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Old 26th November 2005, 04:39 PM   #26
poynton is offline poynton  United Kingdom
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Hi,
I wish people would read the whole post rather than just a part BEFORE commenting!

I did not propose modifying the cd104 - just using the chassis - and yes, I know the TDA1541 is a dac! just as I know that the CD104 uses two TDA1540 dac's and the older chipset .

Rather than do this, I now use a modified Philips CD304 mk2, which has the desired chassis chipset and swingarm mechanism!

I was only asking why the mods were required in the first place!

Thanks

Andy
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Old 27th November 2005, 08:03 PM   #27
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Quote:
Originally posted by drews


No, it's not true!!!!
There are many with CDM1 and digital output.
For example philips cd-304 mkII, Philips cd-960, Marantz cd-94.......

Bye
Andrea

is there any more CDplayer with SPDIF that has a CDM1
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Old 27th November 2005, 08:10 PM   #28
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Quote:
Originally posted by poynton
Hi,
I wish people would read the whole post rather than just a part BEFORE commenting!

I did not propose modifying the cd104 - just using the chassis - and yes, I know the TDA1541 is a dac! just as I know that the CD104 uses two TDA1540 dac's and the older chipset .

Rather than do this, I now use a modified Philips CD304 mk2, which has the desired chassis chipset and swingarm mechanism!

I was only asking why the mods were required in the first place!

Thanks

Andy


the reason to have this mod is to add a SPDIF output to the Marantz CD54. ( which doesn't have one orginally )
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Old 28th November 2005, 07:36 AM   #29
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Quote:
Originally posted by poynton
I came to the conclusion that the only realistic way of achieving this would be to scrap the 2 existing boards and to replace them with later boards, eg from a Philips CD150, and them modify the laser preamp board. This should not be too difficult as it is mainly mechanical and the connections from the laser, focus and tracking motors are similar.

Just a thought.

Andy
Too radical for me.
Adding just the TDA1541/A is considerably easier than adding SPDIF. The TDA1541/A will interface directly with the SAA7000 or the SAA7030 when in the correct mode and removing the TDA1540's and their associated parts should just about provide enough room for it and its caps on a small board. With a little more effort, one could even cater for both wings of the TDA1541/A cult with glitch-free switching between the output of the SAA7000 and the SAA7030. The crushingly unrelenting blandness of the '1541/A will probably swamp any difference though. An AD or BB device with a nice PMD100 would be a much better bet.
SPDIF is a little more difficult but even here, nothing as radical as removing entire boards is necessary. For example, my current effort, if built using discrete logic, would take around a dozen or more TTL packages but a different SPDIF tx would cut that back, possibly at the expense of a microcontroller. And once the data has been formatted such that the SPDIF tx can accept those so inclined can then add the TDA154whatevertheylike.
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Old 28th November 2005, 11:39 AM   #30
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Quote:
Originally posted by rfbrw


Too radical for me.
Adding just the TDA1541/A is considerably easier than adding SPDIF. The TDA1541/A will interface directly with the SAA7000 or the SAA7030 when in the correct mode and removing the TDA1540's and their associated parts should just about provide enough room for it and its caps on a small board. With a little more effort, one could even cater for both wings of the TDA1541/A cult with glitch-free switching between the output of the SAA7000 and the SAA7030. The crushingly unrelenting blandness of the '1541/A will probably swamp any difference though. An AD or BB device with a nice PMD100 would be a much better bet.
SPDIF is a little more difficult but even here, nothing as radical as removing entire boards is necessary. For example, my current effort, if built using discrete logic, would take around a dozen or more TTL packages but a different SPDIF tx would cut that back, possibly at the expense of a microcontroller. And once the data has been formatted such that the SPDIF tx can accept those so inclined can then add the TDA154whatevertheylike.


when will the circuit be compleated? i am lookign forward for it
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