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DAC+ADC pro lost dac on i2c bus

Hans-Juergen

July 17, 2021 11:01

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I use a combination of the DAC+ADC pro with the AAMP60 on a Raspi 3B+

Everything worked fine until the last hearing of music 2 days ago. Now the DAC seems to be dead.

See

"pcm512x: probe of 1-004d failed with error -121"

with dmesg.

i2cdetect find the ADC on 0x4a but nothing else. So the i2c bus seems to work.

Any suggestions beyond using a trash box on its purpose?

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4 comments

• 0
  
  Hans-Juergen July 17, 2021 11:26

  Ok. Removed AAMP60 and used the normal power supply. Its working again.

  Re-Connecting all. It works.

  So....

  I  order other power supplies and some more hifiberries ...

  Thanks a lot for your help :)

• 0
  
  Hans-Juergen August 31, 2021 16:05

  So I am back again with the same problem.

  Changed the power supply to meanwell 18V and replaced the Raspi 3B+ with 3A+ cause I dont need all the IO.The combination is driving the chassis in an active speaker.

  What I observed in the meanwhile

  • Sometimes the DAC+ADC comes back after a while I let it run and then reboot.
  • The two speakers I build sound great. ;) But the problematic one is significant softer. (not measured but used human resource for cross-checking)
  • Changed to the second meanwell and an old brick as PSU I used for the first version. No change.
  • Is it a problem for the class-d AAMP60 to drive the direct connected chassis?

  As sometime the DAC+ADC comes back after let it run a while it may be some sort of temperature problem.

  Or the AAMP60 that is doing the complete power supply has some problems that may influence the I2C communication.

  Any idea what else to check without starting to measure the various things. I did not took out the tools as it sometime started to work as expected. So first I would find more evidence to point to the real problem. Would make it better to handle magic healing.

• 0
  
  HiFiBerry team September 01, 2021 05:06

  My best guess is some kind of contact problem. There is nothing lese connected to the GPIOs?

• 0
  
  Hans-Juergen March 04, 2022 13:31

  Hi,

  yeah. It looks like some contact problem.

  As I am using the combination of a Raspi/DAC+ADC pro and Amplifier only as a proof-of-concept it is only annoying. So I found a way to create somewhat pressure on the boards and than they initialize correctly.

  Now the second combination showing up the same problems. So I am in a hurry to get my target sollution with a teensy4.0 up and running.

  But anyway strange that two installations show up the same problem just month apart. With the teensy4.0 I hope I get more control over the signals and it will be easier to monitor the signal/power-supply and so on. So maybe I find the root cause with that.

  Anyway. Thanks for your incredible work on these compact and high quality boards. (I still think they are the best)