Perhaps it’s viewed best as a test resource. The next stage up from our fine Cuban fellow. It does at least confirm jack is alive and well, and there are situations where quickly proving a signal chain & proper jack implementation really helps fault find at speed. I will be putting a 3.5mm jacked headphone in my wire case for just such a scenario. I’ve been using the Yeti’s audio out which requires the yeti!
We could probably have a look at using headphone out as CV clock or something, now we know what we’re doing.
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This was my initial thought, as you can read on v2 & v3 aluminum cases 
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If you add a “heaphone CV clock”, I vote for a “Korg Volca-compatible” mode too! (Which is just /2, so if the clock module included clock division, it would already have it by magic.)
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Hey everyone ! I want to use headphones output occasionally but I don’t find the way to activate it.
Nothing appears in the admin menu ui, alsa mixer ui and webconf.
I use RC2 and i just update it.
Edit : Solved ! I forgot to reboot the zynthian, my mistake.
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I’m having an issue with the headphone volume controls no longer showing up in the ALSA Mixer (this used to work).
UI log shows:
ERROR:zynthian_engine_mixer.get_controllers_dict: Can’t configure headphones volume control: Headphones volume control not found!
- Headphones are enabled in Admin and I can hear sound, so they work.
- System is up to date:
Kit: V4
Display: ZynScreen 3.5 (v1)
Soundcard: HifiBerry DAC+ ADC PRO
Wiring Layout: MCP23017_ZynScreen
zynthian-ui: master (2ea964)
zynthian-webconf: master (d25055)
zyncoder: master (d706b1)
zynthian-sys: master (a06533)
zynthian-data: master (74ceb3)
Any ideas what may be the issue?
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Please, open an issue on the tracker:
BTW, I also noted this “regression” yesterday …
Thanks!
I just commited a little fix that fixed the problem for me. Please, update and test … but disable and enable again the headphones.
Thanks!
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after updating, and toggling the headphone setting in Admin the headphone volume control reappeared in the ALSA Mixer. It works again. Thank you!
Thank God I read this topic! I have my 4.1 kit for 5 days now and for the first days I ONLY played with headphones. I wasn’t overwhelmed by the audio quality and not at all by the noticeable latency. Playing over my trusty old Genelecs made me happy again. (Very 
)
BUT: a high quality headphone out would be great. I understand that the unsoldered headphone out of the Hifiberry isn’t an output at all? Maybe I’ll take courage and drill some extra holes in the case and put in an extra little headphone amp on 5VDC and take the signal from the output jacks. Might be feasible?
Something to consider: design a Zynthian “pro” case with XLR/combo inputs with switchable bias and a good headphone out with dedicated (analog) volume pot. I would spend the few extra bucks easily for that. Maybe I’ll make it myself one day.
I think that the 3.65mm stereo jack just isn’t soldered at all (J2), but otherwise everything is there for that.
[Edit] => this 3.65mm jack is for Line In, you’re right
?/?
@wyleu the wifiberry can deliver 48V phantom power to the balanced output to connect electret & condensor mikes I read in the specs, via jumpers. A jumper could be replaced by a switch. Combined with a combo/xlr connector you could connect instruments, dynamic & condensor mikes because the ADC has a very broad range of input sensitivity. Wouldn’t that be nice?
Furthermore: I dug somewhat deeper into the hifiberry site and discovered they provide for some IO boards with headphone out, balanced jacks & also XLR with phantom power. I sure would like to use one of them in my Zynthian! They are only OEM, not available to end customers.
@Joost_O I think you make a confusion between 48V phantom power (that would require some boost converter), and mic bias for powering electret microphones
Possibly. I think the 48V will be provided only by the extra IO boards.
wich one ? I couldn’t find anything like this in the hifiberry shop.
Correct. It’s well hidden for end customers:
https://www.hifiberry.com/docs/data-sheets/datasheet-dac-adc-stage/
ok, I see, thank you.
Really interesting.
I managed to make a good quality headphone out off P5 on the hifiberry board:
I had a tiny headphone amp PCB at hand (P5 also provides for 5V DC) but a direct connection delivers enough power. Great with a SennheisserHD 650 with vastly improved latency compared to the PI output! The photo’s speak for themselves. Biggest challenge was drilling the 10mm hole in the case. I removed the screen but couldn’t remove the encoders because of the tightness of the knobs. Working carefully ended up well.
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Shall we hear all these nice sounds too? 
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