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Old 12th September 2013, 08:21 AM   #1111
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Yesterday I fired it up finally for the 1st time
Wow... I even got some music at the output
Bad point is that there is so much noise/ hiss/ digital distortion (?!) and it's very loud!

Checked all the power supply, the voltages are correct.
The settings on spdif transceiver are soldered as on the pics 2,3,4 (tried setting AIF/CONF0 to "-" but that didn't change anything, same noise).

I2S is connected in the following way:
BCK -> BCK
LRCK -> FS
DOUT -> Data
GND -> I2S GND

should be correct I suppose?!

Tried with a scope:
-square wave on spdif output of toslink converter
-BCK & LRCK showed square wave as well
-DOUT showed something weird (should it be square wave as well here?)

Would appreciate any advice!
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Old 12th September 2013, 11:57 PM   #1112
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Default Newbe question - back to post 74!! DC restoration.

Hi Gents,

Sorry to butt in at this advanced juncture but i am not to "electronic" and a newbie to this hobby... but happily am in possession of one fully stuffed red baron DAC and one DC reference board (you know the small red one!!) and wish to use the DAC with the onboard I/V devices.- I have read through the thread and blog and think i understand what to do but just to be 100% certain! - adjusting the level for 0v on the DAC via its test points has been nicely explained (with a diagram) previously..however with regards to the connections of the small outboard DC restoring PCB:

1 . One wire from the DAC audio out (left or right-not "ref" center) can go to the center output (signal) of one phono sockets, the other side of the audio out to the + 5v input on the small PCB,... the other input to the small PCB is fed from the common GND (say from the DC Digital GND ).... hence 2 inputs to the Small PCB.

For the two outputs of the small PCB : + directly to the other phono output socket,..
The ref o/p to the common earth of both phono sockets...adjust both sides via each variable resistor for 0v such that no DC offset is seen between common Phone earth and any one of the two phono signal outputs (with no music playing!)

Er-- is that correct gents?

cheers for helping
Johnny

PS on my Red Baron PCB V 4.0 just above the" R" of the Red Baron legend is what seems to be two small lands ( A link) does this also have to be connected?
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Old 13th September 2013, 10:51 PM   #1113
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Quote:
Originally Posted by dtses View Post
Yesterday I fired it up finally for the 1st time
Wow... I even got some music at the output
Bad point is that there is so much noise/ hiss/ digital distortion (?!) and it's very loud!

Checked all the power supply, the voltages are correct.
The settings on spdif transceiver are soldered as on the pics 2,3,4 (tried setting AIF/CONF0 to "-" but that didn't change anything, same noise).

I2S is connected in the following way:
BCK -> BCK
LRCK -> FS
DOUT -> Data
GND -> I2S GND

should be correct I suppose?!

Tried with a scope:
-square wave on spdif output of toslink converter
-BCK & LRCK showed square wave as well
-DOUT showed something weird (should it be square wave as well here?)

Would appreciate any advice!
I suppose that you have the 3.3v line conected where the old reclock circuit was, I mean, 3.3v to the digital DC input, Is that right? Normally that noise issue is related to the BCK, make sure that the DAC chip receives it properly, and if that is the case check also FS, I do not mean the signal shape itself, I mean if the chip receives those signals properly, because it can happen that they are more attenuated than they should. If you feed digital DC input with 3.3v I think that you do not need that High Speed Buffer PCB, but I am not sure, better ask that to Oliver to be sure (If I am right and the board is not needed probably this is the source of your problem).

I see that you have implemented latest John suggested changes, you must use 1uF decoupling caps for the DEM system in order to work well (I tell you this because I think that you are using 1uF on the MSB and 220nF on the rest of the caps), otherwise you will have high levels of distortion, I do not think that is the source of your noise problem though, but 2.2nF free running oscillator cap must be used with 1uF decoupling caps.

Last edited by Wargreymon; 13th September 2013 at 11:01 PM.
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Old 15th September 2013, 08:34 PM   #1114
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Wargreymon

so it's 3.3v i2s attenuator mod as here. Everything is done as described by Oliver. The HSB in this case is not required.

Quote:
Originally Posted by Wargreymon View Post
... I mean if the chip receives those signals properly...
could you please elaborate a bit how to check that?

Need to mention that the DEM mod hasn't been done yet.
The layout is done to fit 4cm slim line from modu and to have some space left for Ian's boards:
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Old 15th September 2013, 08:46 PM   #1115
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Quote:
Originally Posted by dtses View Post
Wargreymon

so it's 3.3v i2s attenuator mod as here. Everything is done as described by Oliver. The HSB in this case is not required.



could you please elaborate a bit how to check that?

Need to mention that the DEM mod hasn't been done yet.
The layout is done to fit 4cm slim line from modu and to have some space left for Ian's boards:
OK, as I have seen a image of the HSB on your previous post I thought that you had it installed, I now see that is just the image posted by Oliver some time ago.

By checking the signals on the chip I just mean that when you use the oscilloscope you put the probe directly on the pin/pins of the TDA1541A (In case you are not doing it like that of course), because the problem you describe can be a fault of the i2s attenuators, and if you check the signals directly on the PCB conectors where you connect the SPDIF module maybe you are seeing signals that are OK, but they get lost somewhere in the attenuators without reaching de TDA1541A, I happen to suffer the same problem yo have and it was mostly related with BCK not reaching the chip properly, I do not use TP SPDIF module though, I am using Teralink X2 until I decide on an asyncronus USB interface.

If you have not done the DEM clock mod then my previous post does not mean anything, I would recomend you using that last change though because at least in my case it made a tremendous difference in sound quality.

EDIT: Now that I see your latest images there are some diodes missing on the two diodes of the right (I am speaking about the i2s attenuators), you have a single diode installed in both positions where 3 diodes in series should be, unless there is something different when using TP SPDIF module... You also have the 72HC02 installed? You must take it out.


Last edited by Wargreymon; 15th September 2013 at 09:07 PM.
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Old 15th September 2013, 09:31 PM   #1116
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Thanks! Will chech the tda chip then.

There are 3 diodes in series as should be, the picture shows only the top view with two diodes, the rest four pcs are below. Are you sure about the 72HC02 chip, the pic on Oliver's blog doesn't specify any info to remove it?!
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Old 15th September 2013, 09:39 PM   #1117
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Quote:
Originally Posted by dtses View Post
Thanks! Will chech the tda chip then.

There are 3 diodes in series as should be, the picture shows only the top view with two diodes, the rest four pcs are below. Are you sure about the 72HC02 chip, the pic on Oliver's blog doesn't specify any info to remove it?!
OK about the diodes, as I can not see the bottom part did not think that where installed there.

About the 74HC02 I do not have it installed and my DAC works . Taking into account that you have removed all the circuitry associated with the DEM reclock circuit, I do not think it makes much sense to have that chip installed with the rest of the circuit out.

Here you have the post of ECDesigns where it says that, I understand that "CMOS crap" is the 74HC02: Building the ultimate NOS DAC using TDA1541A

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Old 16th September 2013, 03:24 AM   #1118
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Nicely laid out. Will all that fit in one case?
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Old 16th September 2013, 10:38 AM   #1119
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thanks, Wargreymon!
Will remove then today and check TDA chip as well.

Quote:
Originally Posted by merlin2069er View Post
Nicely laid out. Will all that fit in one case?
thanks! The caps are the top point of the dac and are 4cm tall. The base is 3mm aluminum plate which is 400x320mm, so should fit the slim line. However I'm not sure about fitting Ian's FIFO, dual clock and the rest of the boards here. Anyway I would prefer to test the dac firstly as in original configuration and if it would be that good as everybody confirms, I'll contemplate about a taller case
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Old 16th September 2013, 12:18 PM   #1120
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Quote:
Originally Posted by Peterma View Post
Hi does anybody know if I have to re-arrange the 2sk216 pins before i solder them or just solder straight in on Red Baron v5?
You could solder the 2SK216 straight in. The design failure is corrected!


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