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Old 23rd October 2016, 04:47 PM   #1541
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Join Date: May 2006
Location: Holland
Quote:
And for me, does the schematic looks OK?  I didn't shunted the I/V res. when soldered.
Still can't figure what would I do with two different voltage GND from DC ref. board common in the 3.5mm jack for headphone amp.
When I common I get different readings for DC voltage vs. when I measure each channel with it's own GND.
DC reference is used to obtain DC-coupled output by lifting output GND reference voltage to the same DC level as the I/V converter outputs.

When using two monoblocks it is possible to use two separate reference voltages in order to trim DC output to exactly 0V for each channel.

But when driving a headphone with common GND connection or a stereo (pre) amplifier we need a single GND reference.

I suggest to install a single 500 Ohms potentiometer for GND ref.

Connect both decoupling caps in parallel in order to double bypass capacitance. Then trim for lowest and equal DC-offset on both L and R outputs.

So remove both DC reference pots, put in one 470 … 500R pot and connect the decoupling cap of the other channel to the wiper of this pot. Then use the wiper of this pot as single GND reference.

DC offset differences between L and R channels are usualy caused by tolerances in the TDA1541A on-chip current reference sources.

This means we can null L/R channel DC-offset by fine tuning the I/V resistor value. Measure the voltage across both I/V resistors (after completing MOSFET current buffer trimming). Lower the I/V resistor value that has slightly higher voltage across it, so it exactly matches the voltage across the other I/V resistor.

The easiest way to do this is placing a suitable high ohmic resistor in parallel with the I/V resistor that has highest DC voltage across it.
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Old 26th October 2016, 03:38 AM   #1542
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Hello!

Thanks for the great response!

I'm not planning to use a second Red Baron DAC board (at least for now), so can I skip the DC reference PCB and use the common analog GND output and L & R output through capacitors?
If yes, what value to use, and maybe some recommendation? (Ampohm, Mundorf, PIO etc.)


Kind rgs,
Alex.
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Old 26th October 2016, 05:53 AM   #1543
kp93300 is offline kp93300  Malaysia
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Default Red baron working !!

Thanks to John and Oliver .
The Red Baron is singing and I hope the wiring for the Dc reference module is OK . I manage to null the dc across the IV resistor.
I post my build and I hope my wiring is correct.
Anyway I have input caps in my pre .
Sounds very relax, 3D imaging. Outstanding high, mid and low .
Vocal is especially detail.
regards
kp93300
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Old 1st November 2016, 08:57 AM   #1544
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Hi,

Red Baron is up and running.
I don't use anymore the reference DC module. I coupled direct the analog exit through 1uF capacitors, and now I have the common ground. Before caps I have ~1VDC.
I feed the signal to an O2 headphone amp that feeds HD600.

Sounds really nice even with those capacitors and crappy I/V resistors.
Now I have to make a nice housing and get some ''snake-oil'' resistors and caps.

Thanks a lot for your great support, and the patience to answer to my questions!

Kind rgs,
Alex.
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Old 10th January 2017, 04:12 PM   #1545
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Default End of Project

Dear diyaudio friends,

after now 7 years, my TDA1541A DAC project comes to the end.

It was a great pleasure to develop this project with much help from the community.

Thank you all, you were GREAT!

My special thanks goes to John -ecdesigns- for his support over the years.

In the next days i will disassemble all parts of my own DAC for sale.

For those who are interested, stay tuned to my blog. You will find the parts with prices shortly.


Audiophlile Greetings
Oliver


P.S.: A few PCBs from the project are still in stock
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Old 10th January 2017, 05:05 PM   #1546
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Thank you Oliver for all the work you have put into this project! I still have my Red Baron, I'm still enjoying it every day - and I'm still tweaking it. It looks like a mess but with this D3a output stage it sounds really excellent.
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Old 10th January 2017, 05:35 PM   #1547
Mayday is offline Mayday  Sweden
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Yes, a big thank you to Oliver.
Any future projects in the works?
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Old 10th January 2017, 05:38 PM   #1548
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Quote:
Originally Posted by Mayday View Post
Yes, a big thank you to Oliver.
Any future projects in the works?
ATM no, just for myself...
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Old 10th January 2017, 05:40 PM   #1549
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Quote:
Originally Posted by Vbenonisen View Post
Thank you Oliver for all the work you have put into this project! I still have my Red Baron, I'm still enjoying it every day - and I'm still tweaking it. It looks like a mess but with this D3a output stage it sounds really excellent.
Looks marvelous!
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Old 10th January 2017, 09:58 PM   #1550
BarG01 is offline BarG01  Hungary
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Hi Oliver,
I feel I'm really lucky not being late with Red Baron acquisition. During the Christmas season I managed to assembly it with Ians fifo kit and this composition sounds amazing! Although its only with I2S connection and with simple TDA1541A chip, still having the possibility to improve.
Thank you for the great music player device!
Gbor
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