Building the ultimate NOS DAC using TDA1541A

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koldby

koldby

Member
Joined 2003
Hans Polak

If you are here, could I persuade you to make some .wav files with 1 kHz -40 -50 -60 dB?
The reason for this is that I have found that there is much difference between the .wav files I have downloaded from the net. And the files you have made with -90,32 dB is the cleanest I have seen :p
In this thread I am measuring a No Dac direct DSD and here the results are even more different than in the TDA1541A.
https://www.diyaudio.com/forums/digital-line-level/273474-dac-dac-198.html#post5781371
 
H

Hans Polak

Member
Joined 2005
koldby said:
Hans Polak

If you are here, could I persuade you to make some .wav files with 1 kHz -40 -50 -60 dB?
The reason for this is that I have found that there is much difference between the .wav files I have downloaded from the net. And the files you have made with -90,32 dB is the cleanest I have seen :p
In this thread I am measuring a No Dac direct DSD and here the results are even more different than in the TDA1541A.
https://www.diyaudio.com/forums/digital-line-level/273474-dac-dac-198.html#post5781371
Click to expand...
How long should the be in seconds.

Hans
 
Z

Zoran

Member
Joined 2004
zorandimovski.com
koldby said:
My setup is only for testing as it is now. I hav no schematics. However:
The background for it is what ecdesign describes in post 6116.
But I use the i2s to signed magnitude as described in 6126.
There are errors in that schematic as described in post 7069.
The output is what I describe in post 7273 and shown in picture.
Hope this helps.
Click to expand...

Hi Koldby :)
Thanks.
 
sthcoaster

sthcoaster

Member
Joined 2016
Paid Member
In John’s original 50hz DeM schematic with 1x tda1541a and in his comment below he gives 1uf for the oscillator cap - but in his schematic for 2x tda1541a which is attached to the post I am replying to and despite what he indicates in the text, the value in the schematic is given as 2.2uf

So does the value of this cap change if you use 1 or 2 chips?

ecdesigns said:
Hi sumotan,



!00uF/25V caps, plus (+) connects to GND (0V). Minus connects to the pin of the TDA1541A.

Reason: the DC voltage on the 14 TDA1541A decoupling pins is negative (-12 ... -14V typical) with respect to GND.

1uF film cap between pins 16 & 17, 12K resistor between pin 15 and pin 17.

See attached schematic.
Click to expand...
 
weissi

weissi

Member
Joined 2002
sthcoaster said:
In John’s original 50hz DeM schematic with 1x tda1541a and in his comment below he gives 1uf for the oscillator cap - but in his schematic for 2x tda1541a which is attached to the post I am replying to and despite what he indicates in the text, the value in the schematic is given as 2.2uf

So does the value of this cap change if you use 1 or 2 chips?
Click to expand...

No, use what you have by hand. Either value will do it.
 
A

aive

Member
Joined 2013
koldby said:
So story ends here .. I am so sorry to hear your board is dead now. I can tell you ryanj's board is working well and not that difficult to solder.I am a -52 vintage, so my eyes and hands are not what they used to be either. Remember to buy the right parts in the correct housing ( I got some of the IC's in a smaller package first time around)
For others , who wants to correct Ians board: Invert the CLK out of Ians board to TDA1541A, disconnect the LE out from Ians board and connect the LE input on the TDA1541a board to the WS input on Ians board (in parallel with the cable from i2s source to Ians board) . Data input and DL and DR is not changed.
Click to expand...

Sorry to revive an old post - but I’ve bought an inverter and plan to make the bck mod/fix. Will checkout the LE issue if I’m successful with bck.

Thanks for all the previous discussion on this.
 
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