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Building the ultimate NOS DAC using TDA1541A
Building the ultimate NOS DAC using TDA1541A
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Old 5th July 2018, 06:35 AM   #6291
sumotan is offline sumotan  Indonesia
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Join Date: Oct 2013
Hi Sserg

Okay, guys. Let's see how you will laugh after your attempts end in full failure.

I think I understand what John is getting at but I知 not smart enough to implement this correctly so I値l just focus on what I know & learn from the experts here in the forum.
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Old 5th July 2018, 11:24 AM   #6292
SSerg is offline SSerg  Russian Federation
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Join Date: Mar 2012
Location: St.Petersburg
Hi sumotan,
Quote:
Originally Posted by sumotan View Post
I think I understand what John is getting at but I知 not smart enough to implement this correctly so I値l just focus on what I know & learn from the experts here in the forum.
I just wanted to warn against a mistake. But some are stubbornly wanting to implement an erroneous decision. I have already run out of arguments, it's awkward to repeat them again and again.
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Old 5th July 2018, 11:42 AM   #6293
weissi is offline weissi  Austria
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Location: Austria
OK all the pro and contras here - John, what about measurements? The improvements of Johns approach should be seen in THD+N. ?
__________________
regards / servus
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Old 6th July 2018, 10:57 AM   #6294
gaetan8888 is offline gaetan8888  Canada
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Join Date: Apr 2007
Hello

I want to use the WM8804 to replace the CS8412 in my NOS TDA1541 dac.

Since WM8804 are cmos 3.3v out and the TDA1541 are TTL 5v I2s input, I would use buffers for the 3 I2s signals between the WM8804 and the TDA1541.

I have many 74AC04, but it would invert the signal, can I use two 74AC04 in serial for each I2s signals, so it would buffered without inverting the I2s signal ?

Thank

Bye

Gaetan
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Old 6th July 2018, 12:17 PM   #6295
lcsaszar is offline lcsaszar  Hungary
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Join Date: Mar 2004
Location: Budapest, Hungary
Quote:
Originally Posted by gaetan8888 View Post
...the TDA1541 are TTL 5v I2s input...
Not quite true, ecdesigns John recommended an attenuator on the I2S lines. I suppose direct CMOS driving should be OK, no need to use any buffer.
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Old 6th July 2018, 12:22 PM   #6296
gaetan8888 is offline gaetan8888  Canada
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Join Date: Apr 2007
Quote:
Originally Posted by lcsaszar View Post
Not quite true, ecdesigns John recommended an attenuator on the I2S lines. I suppose direct CMOS driving should be OK, no need to use any buffer.
Hello

Every one I know who do direct CMOS driving from the WM8804 to the TDA1541 just get noise or no output signal.

Thank

Bye

Gaetan
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Old 6th July 2018, 01:22 PM   #6297
3lite is offline 3lite  Poland
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Join Date: May 2016
TDA1541A will work fine with 3.3V on its input. AFAIR TTL levels define >= 2.0V as H and <= 0.8V as L.
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Old 10th July 2018, 03:44 AM   #6298
gaetan8888 is offline gaetan8888  Canada
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Join Date: Apr 2007
Hello

Some times ago, I've read in few web pages or forums, about guys who use the WM8804 or WM8805 with the TDA1541 in NOS mode, and the output signal was not good, they use buffers for I2S signal and they get a good output signal. Maby the WM8804 or WM8805 cannot have enough current to drive the WS, BCK, and DATA signal of the TDA1541.

I did trace back only one of those page but here it is.

Twisted Pear S/PDIF WM8804 Transceiver Module on TDA1541A problem

Thank

Bye

Gaetan

Last edited by gaetan8888; 10th July 2018 at 03:46 AM.
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Old 10th July 2018, 06:06 AM   #6299
JOSI1 is offline JOSI1  Germany
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Join Date: Mar 2006
Location: Bad Hersfeld
Hello Geatan,
the 74ACxxx family produces a great amount of switching noise.
It's better to use a non inverting buffer (e.g. 74HC125) since every additional gate
increases jitter level.
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Old 11th July 2018, 04:03 AM   #6300
Trajan is offline Trajan  United States
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Join Date: Apr 2014
Try the hex inverter serially. The best tool you have is the one in front of you. I have had no issues doing what you intend to. Maybe not ideal, but sometimes in customs DACs you have some free '04 pins and can utilize two as such.
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