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Old 20th December 2014, 05:32 PM   #1
Green77 is offline Green77  Sweden
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Join Date: May 2007
Location: MJOLBY
Default Help with tda1541a dac kit pcb

Hello all!
I'm a total noob with digital signals..so, that said!
I bourght a Analoge metric pcb and order all parts for the digital
side on that pcb. I will go with a tube stage after the tda1541a.

I'm done with the pcb, hoocked it up with a usb to spdif conv. and put out a sinus wave from computer. It looks like (with a scope) that i have data to the dac chip. But nothing comes out on pin 6 and 25...
I will check tomorrow what data i have in. One thing that was strange was that i
dont have anything on pin 16 and 17, and i have a 470pf cap there..

Regards//Daniel
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Old 22nd December 2014, 09:46 AM   #2
Green77 is offline Green77  Sweden
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Join Date: May 2007
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Hello again

I did some messure this weekend.. I don't know if you folks, that understands this, can read something out of it.

I put a 1kHz sinus input (from usb to spdif converter) and messure with a scope. I wrote the wave frequences down.

At the output of the tda1541 i used a 47 ohm resistor to ground. But i didn't have any sinus output (see pic below).

Frequences at the diffrent pins:

Click the image to open in full size.


And the output at pin 6 and 25 of TDA1541 (same on both pin):
Click the image to open in full size.


Anyone?


Regards// Daniel
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Old 22nd December 2014, 11:30 PM   #3
Ben Mah is offline Ben Mah  Canada
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Is your input signal a stereo wav file? Have you tried inputting a music file? An oscilloscope shot of the signal at the input pin (#3) of the dac chip would be helpful. It will show whether a proper I2S signal is reaching the dac chip.
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Old 23rd December 2014, 06:13 AM   #4
Green77 is offline Green77  Sweden
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Thanks!! I will post a pic of that later today.
Regards//Daniel
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Old 23rd December 2014, 01:30 PM   #5
Green77 is offline Green77  Sweden
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Hello

So i messure with a scope at pin 3 on the TDA1541A playing music at 16 bit 44,1 kHz.

Looks like this at 200ns and 1us.
Last Picture is the output at pin 6.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Regards //Daniel
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Old 23rd December 2014, 04:24 PM   #6
Ben Mah is offline Ben Mah  Canada
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Location: Vancouver
Hi Daniel,

Just a warning before I proceed: I am not an electronics expert or professional. I'm just a diyer that has played around with a diy 1541a dac, who is trying to help another diyer. So what I say may not be correct. I am just speaking based on my diy experience. My dac does not have oversampling so it does not have the SAA7220 chip, and I also now use a usb to I2s device so no CS8412 either.

The output of the SAA7220(pin 14)/input of tda1541a(pin 3) oscilloscope shot looks not like what I have seen before. This webpage shows some examples:http://lampizator.eu/LAMPIZATOR/TRAN...port_DIY.htmlo

So there may be issues with the signal to the dac chip.

Also, is the other 1541a output similar to pin 6?

Have you double checked the component placement, solder joints, and power supply voltages at the chip power pins? Have you searched the internet for known issues with the board?

I hope that someone with knowledge of digital circuits chimes in.

Ben
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Old 23rd December 2014, 04:59 PM   #7
Ben Mah is offline Ben Mah  Canada
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Daniel,

Looking at your schematic, the CS8412 does not appear to be in the proper mode. When I had the CS8412 in my dac, pin 23 was grounded. Your schematic shows it with V+, which I believe is not correct.

Ben

edit:

However, your circuit has reclocking and mine didn't, so i may be totally wrong.

Last edited by Ben Mah; 23rd December 2014 at 05:15 PM.
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Old 23rd December 2014, 06:40 PM   #8
Ben Mah is offline Ben Mah  Canada
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http://analogmetric.com/download/TDA...r%20Manual.pdf

Lots of useful information.

Have you tried listening to the dac output? Maybe it is working.

Ben
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Old 23rd December 2014, 10:14 PM   #9
Green77 is offline Green77  Sweden
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Thanks all!!

I will check this and come back in a few days...not so much sparetime around christmas.

Marry Christmas everyone!

Regards //Daniel
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