Hey many thanks for your help! @C0d3man --> I tried with a power bank but the noise is still there @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…
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
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”.
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 …
Zynthian -> RCA LR out or Jack LR out (I get the same noise from both) to -> Mackie 1202 VLZ4 tried all the inputs/channels (and nothing changes with a different mixer: I tried also with a Thomann the t.mix mix 802), I’m listening through my old Sony headphones or through a couple of KRK RP6 Rokit (headphones connected to the headphones out, monitors connected to the main output XLR), that’s all.
Reg the article: it’s about the old Onyx series - analog mixers with integrated digital interface, the 1202 VLZ4 is just a simple analog one and, after all, with another mixer the problem persists…
Have you tried the alsamixer from Zynthian’s command line? There are a few options there (although the default should be OK).
These options include things like “automute” feature, etc. I’ve playing with this features, but i can’t reproduce your problem. Anyway, perhaps you can use it to solve it
@jofemodo THANK YOU!! I took a look at alsamixer and yes - the problem was there: the “AutoMute” function was on, turned it off and now the noise is gone!