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Old 13th June 2011, 09:32 AM   #31
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by gaetan8888 View Post
Since, in the Thorsten's example for those cd players, the opamp are use in inverting input, that 10nF cap from the inverting input to ground are just an input filtering to filter rf frequency ?
No, it is not. Simply build as instructed and it will work.

If not read up on noisegain, lag-lead compensation and all the related topics. It has been repeatedly discussed at DIYA.

Ciao T
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Old 13th June 2011, 09:36 AM   #32
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by gaetan8888 View Post
And about the slew-rate of the 637 with the higher value of that compensation cap ?
I am suggesting to REMOVE the compensation cap. The schematic I suggest does not affect slew rate as such., it primarily assures stability and secondly reduces the problems if the current step from the DAC is so fast that Op-Amp's feedback loop "unlocks".

Ciao T
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Old 16th June 2011, 02:46 PM   #33
diyAudio Member
 
Join Date: Sep 2010
Location: Oklahoma, Tornado Alley
Quote:
Originally Posted by ThorstenL View Post
Hi,



FWIW, the AMR CD-77 uses special PECL based reclocker/drivers for the TDA1541 which among others also perform attenuation....
....So in many areas it is a tour de force of what can be done.

The sound will not please everyone, nor is it meant to, it is a Player that is firmly "Digital to Analog" in sonic nature. Those who actually LIKE digital sound will be disappointed.

Ciao T
Thorsten, thanks for putting light on CD-77. I tired to build a case on the superiority of CD-77 but no one except you could do that on technical grounds. However, I have since audition many other DACs/Players and CD-77 is in fact closer to vinyl.
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Old 16th June 2011, 03:03 PM   #34
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by new2hifi View Post
I have since audition many other DACs/Players and CD-77 is in fact closer to vinyl.
The CD-77 was designed and realised by people who like vinyl, single ended triodes and high efficiency speakers. It should not come as surprise that it's sound tends into this direction. Hence also my suggesting "it's sound will not please everyone".

Ciao T
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Old 21st October 2011, 04:26 PM   #35
diyAudio Member
 
Join Date: Oct 2005
I backtracked my steps, and tried to remember when things went wrong. Dem reclocking with a cap, but also the direct clocking of the dac by clock/2 was probably the moment when the sound got worse.

So i restored the connection between the Sa7220 and the dac and shorten the clockline to the 7310 as much as possible by drilling through the pcb, and there was a clear improvement (not perfect yet obviously)

As everybody here is only using NOS, i haven't seen solutions how to sync the divider from the direct clocking of the tda1541a with the now unused output of the saa7220.
So does it have to be in sync? (Data and WS still coming from the digital filter), or should i try the inverse output of the divider?
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