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Old 30th September 2003, 10:17 PM   #11
Bricolo is offline Bricolo  France
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Default Re: Re: Re: Re: NOS Dac noise when changing tracks

Quote:
Originally posted by Elso Kwak



Bricolo,
If you have a look at the schematic you will see that this even works with a SAA7220 removed from the circuit.
Marco Amboldi' s NON-OS mod is to cut tracks on the PCB and to install jumper wires. I just remove the SAA7220.
The muting mod works in both cases.
See also:
http://members.xoom.virgilio.it/hi_fi/cd960.htm
and
http://members.xoom.virgilio.it/hi_fi/com.htm
I also installed the muting mod in my own CD650 and I can tell you it works!
In fact, this tweak connects the 7210/7310's mute output to the bases of the muting transistors. Am I right?

If I am, how can I fix the same problem, but on a self made nos dac (with I2S, and TDA DAC), that of course hasn't muting transistors


PS: Elso, I got the Horowitz & Hill from my university's library. Time for learning
I'll try to finish reading chapter 2 this evening (it's already late ), I like the book, things are soo clearly explained
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Old 1st October 2003, 07:30 AM   #12
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Cool Re: Re: Re: Re: Re: NOS Dac noise when changing tracks

Quote:
Originally posted by Bricolo

In fact, this tweak connects the 7210/7310's mute output to the bases of the muting transistors. Am I right?
Bricolo, no you are not right. No muting transistors are involved. [In fact I removed all muting transistors]. Muting comes from the servo panel, that is connected to pin 23 or pad of SAA7210 and goes straight to the pin 11 of the SAA7210. Pin 11 of the digital signal processor is a muting-in connection.
So the muting is done in the digital signal processor before the NON-OS DAC.

In my Philips CD931 I did not experience this muting problem when taking off I2S signals for my NON-OS DAC: [SAA7310]->[74HC125]->[TDA1543]->[OPA604]->[discrete ouputbuffer].


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Old 1st October 2003, 09:08 AM   #13
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Default Re: Re: Re: Re: Re: Re: NOS Dac noise when changing tracks

Quote:
Originally posted by Elso Kwak

Bricolo, no you are not right. No muting transistors are involved. [In fact I removed all muting transistors]. Muting comes from the servo panel, that is connected to pin 23 or pad of SAA7210 and goes straight to the pin 11 of the SAA7210. Pin 11 of the digital signal processor is a muting-in connection.
So the muting is done in the digital signal processor before the NON-OS DAC.

In my Philips CD931 I did not experience this muting problem when taking off I2S signals for my NON-OS DAC: [SAA7310]->[74HC125]->[TDA1543]->[OPA604]->[discrete ouputbuffer].
Yeeeeeeeeeeeesssssssssssssssss!!!
Hey Elso, the trick works wonders.
I made it yesterday at night, and it's beautiful.
I don't have the muting transistors too, that's one of the first things I remove.
Now I have the internal TDA1541 in NOS mode (and muting ) and my board with TDA1543 in nos mode (and muting too ).
Gotta A-B that thing.
Gotta buy you a beer, man.
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Old 1st October 2003, 10:12 PM   #14
Bricolo is offline Bricolo  France
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Default Re: Re: Re: Re: Re: Re: NOS Dac noise when changing tracks

Quote:
Originally posted by Elso Kwak

Bricolo, no you are not right. No muting transistors are involved. [In fact I removed all muting transistors]. Muting comes from the servo panel, that is connected to pin 23 or pad of SAA7210 and goes straight to the pin 11 of the SAA7210. Pin 11 of the digital signal processor is a muting-in connection.
So the muting is done in the digital signal processor before the NON-OS DAC.

In my Philips CD931 I did not experience this muting problem when taking off I2S signals for my NON-OS DAC: [SAA7310]->[74HC125]->[TDA1543]->[OPA604]->[discrete ouputbuffer].



OK,


And how is the whole thing connected before any mod?

Decoder to 7220 mute in, and after?
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Old 2nd October 2003, 09:17 AM   #15
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Bricolo,

Read the link that Elso posted, it's all there.
For muting, just connect pin 23 of SAA7220 to pin 11 of SAA7210.
That's it.
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