A weird noise is driving me mad [SOLVED]

Using Zynthian
4

Perhaps your power-supply? Can you try to change or use a power bank?

Do you have a chance for using a ground-lift (perhaps by using a DI box)?

Regards, Holger

5

It seems also to me a noise gate of some kind. In the third file, the click can be heard even at the beginning of each note. The “click” can be seen opening the wave with something like audacity.

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Very strange


2 Likes
6

Is that the from the RCA (red and white phono) output?

7

Hey many thanks for your help!
@C0d3man --> I tried with a power bank but the noise is still there :anguished:
@Baggypants --> Yes, the recording was made using the RCA but using jacks the result is the same.
And of course nothing changes using another mixer


Is it likely to think that the HB DAC+ is gone?

8

I’d try powering it from a big mobile phone battery pack to rule out the PSU first.

9

@Baggypants --> did it with two different power banks: the noise remains :weary: (I’ve also tried with another power supply with no joy)

Any procedure to test the HB DAC+ before buying another one? (And is there any warranty on the card?)

Thanks!

10

Have you tried with the “alsamixer” from command line? Perhaps there is some options there 


Regards,

11

@jofemodo and @Baggypants could you post part number, version and manufacturing date of your DAC chip (better: a full READABLE picture of the chip)

12

Sorry, I meant to tag @sadkermit


13

This is from Daniel, the creator of HifiBerry DAC+:

Hi José,
there were no hardware changes in the DAC.
Unfortunately I can’t say anything about this specific problem. It could be a problem of the circuit that the DAC+ is connected to.
If would check what’s on the output of the DAC.
Best regards,
Daniel

Regards,

14

My question about revisions are tied to the TI notes on the PCM512x.

There are two (three, actually) hardware revision of the chip.
The Jan. 2016 revision removed a feature called “Internal Pop-Free Control For Sample-Rate Changes Or Clock Halts”.

15

Interesting 
 let see what Daniel says :wink:

16

Hi @Axeman!
Could you post the link to the TI revision notes?

17

http://www.ti.com/lit/ds/symlink/pcm5122.pdf

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18

Re reading the doc, maybe these are revision of DOCUMENTATION and not of the chip itself

I never liked TI documentation since the 74XX data books :slight_smile:

1 Like
19

Ups! yes 
 it looks to be Documentation Revision 
 :wink:

20

Your Honor, I retire my question and throw myself on the mercy of the court! :rofl:

21

Good try, Mr. @Axeman! :kissing_heart:

22

Hey the discussion is getting intriguing
 :nerd_face:

@jofemodo --> “If would check what’s on the output of the DAC” sorry if this is a stupid question but does it mean “after the output of the Zynthian”?

23

Yes, after the output of Zynthian :wink:

Please, specify exactly your full audio chain. What devices are connected downstream from zynthian, what order, what type of connection, etc.

Regarding your mixer, check this:

https://larryjordan.com/articles/why-i-returned-a-mackie-mixer/

I didn’t read the article completely, but it seems like some Mackie products having problems with audio levels when recording to digital. Perhaps it could be related 


Regards,