0

Testing Analog Input of DAC+ ADC PRO

Samuel Kälin

June 13, 2022 17:04

None

Follow

I purchased the DAC+ADC PRO to both send and receive live audio.

I set up the Raspi as Described by the Instructions and I see the sounddevice in both aplay -l and arecord -l.
I deactivated all other soundcards.

Using aplay works, the red LED comes of the DAC comes on and the sound plays.

Using arecord

arecord -f S16_LE -c2 -d 10 -r 16000 --device="hw:1,0" test.wav

also turns on the red LED and records a file. But there is no sound in the file. (Checked with both active and passive microphones and an AUX Output from a different Device).

I checked the config in alsamixer, and ADC Gain is 40, ADC Left is VINL1 and ADC Right is VINR1, ADC Mic Bias is on. I also tried various other alsamixer settings. 

Is there anything else I can check?

Thanks already in advance for any help :).

• Facebook
• Twitter
• LinkedIn

6 comments

• 0
  
  HiFiBerry team June 14, 2022 17:15

  Why is it hw:1,0 if you disabled everything else?

• 0
  
  Samuel Kälin June 14, 2022 20:46

  Hi,

  Thanks for your quick reply.

  Card 0 is the vc4-hdmi-1, which I did not find an easy way to deactivate.

  I did not consider it an issue and after hours of trying different things I forgot about it when writing my post. 

  Edited by Samuel Kälin June 14, 2022 20:47
• 0
  
  marco June 15, 2022 02:31

  hi,

  dtoverlay=vc4-fkms-v3d,audio=off

  see: 

  https://www.hifiberry.com/docs/software/configuring-linux-3-18-x/

  lg

   

• 0
  
  Samuel Kälin June 15, 2022 06:37

  Hi Marco,

  Thanks for your reply.

  I rechecked the config.txt file and you are right, I had 

  dtoverlay=vc4-kms-v3d,audio=off

  instead of

  dtoverlay=vc4-fkms-v3d,audio=off

  in my /boot/config.txt.

  Now I only have the one Soundcard and used:

  arecord -f S16_LE -c2 -d 10 -r 16000 --device="hw:0,0" test.wav

  But the problem still persists. No Audio is recorded.

  Here is my updated /boot/config.txt file.
  https://drive.google.com/file/d/14VALxtzNFWq66s6jsWxt5v2sR9H-zn4i/view?usp=sharing 

• 0
  
  HiFiBerry team June 16, 2022 05:08

  You are using an incorrect sample rate: 16kHz is not supported. You need to use 44.1kHz or more.

• 0
  
  Samuel Kälin June 16, 2022 13:37

  Thank your for your response.
  So today came a new DAC+ ADC PRO because my task is somewhat time critical.
  Using 

  arecord -f S16_LE -c2 -d 10 -r 441000 --device="hw:0,0" test.wav

  does work on the new hat. The same command does not work on the "old" hat, so it seems to be defective.

  It would be nice to show such a test-command in the Guide of the product.

  Again, thanks for your help and best regards,

  Samuel