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Old 3rd October 2011, 01:34 PM   #781
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Hi antonioo, have you done a sq comparison?


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Old 3rd October 2011, 04:19 PM   #782
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I have not finished the red baron, i had a hard time finding
Hitachi SK''s.
Previous i had 2 dac''s (green pcb), one wonders off to a friend,
To try out some combination''s need''s a lot off time.
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Old 10th October 2011, 11:12 AM   #783
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Question to oliver.

The RIV resistors bother me, if i use 2x redbaron, i use 4x 250 ohm.
Is that right??
On your pictures there none.!!
The little ground module- i toke 5v and gnd from dac pcb. on the
output side i have 2 gnd''s??.
My gues is to use audio out-ref , where to put it?
What to do with adjust R''s on Dac and on the small pcb??
Is that double?

Ihope you can help me.
Greetings Ton
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Old 10th October 2011, 01:32 PM   #784
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Quote:
Originally Posted by antonioo View Post
Question to oliver.

The RIV resistors bother me, if i use 2x redbaron, i use 4x 250 ohm.
Is that right??
On your pictures there none.!!
The little ground module- i toke 5v and gnd from dac pcb. on the
output side i have 2 gnd''s??.
My gues is to use audio out-ref , where to put it?
What to do with adjust R''s on Dac and on the small pcb??
Is that double?

Ihope you can help me.
Greetings Ton
Hi Ton,

if you want to use two Red Baron DACs parallel with the onboard I/V stage, you must connect it like this:

1st - Every DAC module needs all parts of the I/V stage, expect the I/V resistors. Adjust the DAC output to 0V (DC-offset of the TDA1541A).

Click the image to open in full size.

Dont forget to make the small modification and switch the source and drain of the MOSFET like in this picture !!!

Click the image to open in full size.

2nd - The output of the current buffers on each DAC module (inner four-sided point of the I/V resistor) must be connected together (parallel).

Click the image to open in full size.

3rd - You need only one pair of I/V resistors with 250R value on one DAC module (four-sided / round point).

4th - You connect the DC-Reference Module as followed:

From DAC module

Ref. (Audio out) --> Ref. +5V
GND (DC Digital) --> GND

From DC Ref. Module

GND Ref. Left --> GND RCA Left
GND Ref. Right --> GND RAC Right

You could see it on this photo

Click the image to open in full size.

5th - Trimm the RCA GND to 0V

Click the image to open in full size.


Thats it.

Cheers
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Old 10th October 2011, 11:37 PM   #785
noizas is offline noizas  Lithuania
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Quote:
Originally Posted by dvb-projekt View Post

1st - Every DAC module needs all parts of the I/V stage, expect the I/V resistors. Adjust the DAC output to 0V (DC-offset of the TDA1541A).
Hi Oliver,

I cannot catch idea, how it is possible to adjust AOR and AOL outputs to 0 VDC (to GND/A) without I/V resistors?
If R1 and R2 are missing there are no pull up circuits with DC source "above" GND/A to compensate -2mA drain, IMHO.

Maybe I'm missed something, can you explain?

Saulius
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Old 11th October 2011, 12:54 PM   #786
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Quote:
Originally Posted by noizas View Post
Hi Oliver,

I cannot catch idea, how it is possible to adjust AOR and AOL outputs to 0 VDC (to GND/A) without I/V resistors?
If R1 and R2 are missing there are no pull up circuits with DC source "above" GND/A to compensate -2mA drain, IMHO.

Maybe I'm missed something, can you explain?

Saulius
Hi Saulius,

all measurements must be done with the I/V resistors, correct.
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Old 12th October 2011, 09:00 AM   #787
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I have 1 red baron playing, with a sp/dif entree , made of the CS8414 chip.
The same (old) problem occours: BCK wont accept the 68R and 220R.
It dont need''s a buffer.
What is at this moment the best ( buy??) thing to do.

Anton
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Old 12th October 2011, 09:05 AM   #788
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Quote:
Originally Posted by antonioo View Post
The same (old) problem occours: BCK wont accept the 68R and 220R.

Anton
What do you mean? If it plays without the attenuation resistors, i'd opt to just leaving them out. I tried using the buffer stage made by Oliver, but there is significant jitter introduced...
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Old 12th October 2011, 09:37 AM   #789
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Hi Studiostevus

I disconnect both resistor''s at the point where they meet with BCK, else
no sound, with Dac v2.3 te same.
anton
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Old 12th October 2011, 10:18 AM   #790
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May be due to the level of the bck signal. You can fix this by:
- connecting bck directly without the resistors
- using a buffer to increase the bck signal, and then the resistors to decrease them again. This doesnt have my preference

- Check ecdesign's thread on the latest circuit for i2s attenuation (using diodes) and devise a circuit that fits your bck-source

On the other hand, the cs84xx is a widely used receiver. Maybe someone who has used this one can reply on how to get it working
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