Zynthian "Mobile"

I would like to present to you my Zynthian Mobile kit:

In the future, it would be nice if we could integrate the battery inside the case, including the charger circuit and a real power-on/power-off switch.

Also, a working headphones output should be added to zynthian. I tried to do it some months ago, but i didn’t finish the task.

Currently, i think the better option is using the IQ-Audio sound card:

It’s a little bit more expensive than HB, but a few euros doesn’t make a big difference and the integrated headphones output is a nice feature for zynthian. What do you think?

3 Likes

Absolutelly agree!!. I think it’s worth it for a few extra euros.

Regards.

Nice! Would fit into my suitcase :slight_smile:

The guys from HB havn’t answered for your question about some additional features (headphone out, line in)?

Regards, Holger

@jofemodo

how long can you make music and what kind of powerbank (Ah) are you using?

Regards, Holger

The HB guys told me that they haven’t any plan for adding a headphones output in the near future, nor an audio input. But, if a number of zynthian users make some pressure, perhaps they could change their position.

However, they have offered a 10% discount for Zynthian buyers. I will try to get promocodes starting in September.

Regarding the battery, it’s 2600 mAh, and it can power the zynthian making sound for more than 2 hours (using RBPi-2, i’ve not measured the time with a RBPi-3).

@jofemodo,
It’s a great setup!I love it…it could use it playng live with my bands!
The earphone out could be a very useful feature.I saw that my HB has an output 3.5 jack.Is it the same lineout line of rca connectors I imagine…
In any case I will try to reproduce your setup,especially the metal box for zynthian, when my mechanical expert (my father) will be back from holidays… :slight_smile:

@marcolastri

I am not sure, but I think I have read that the lineout for the 3.5 jack is not amped - for headphones you need to add a headphone amp.

Regards, Holger

Like the mobile setup very much. Not that I am ‘on tour’, but being able to play in the living room or the backyard would be great. Like the IQaudio dac and the HP amp is worth the extra cost. As long as it is supported well; and seems it is, in the latest Raspbian
I haven’t started buying parts/building Zynthian as I’m still in a ‘honeymoon’ phase with my Pi2, very fun working out a workflow and setup. So this dac will be on the ‘list’ :slight_smile:
Yogi

I finally completed my mobile box. A friend of mine built the lipo block. I had to step it down to 5V. I made no longtime tests yet. Theoretically it should last 5 hrs.

It should have enough amps but the red flash is shown sometimes. I will see, if it will be a real problem.


6 Likes

And all goes into the zynth on a usb connector…?

I do wonder if USB might have well stuck to 0.5 amps before Apple mugged it.

I do like to see a little copper in these sorts of situations :smiley:
Do batteries prefer to be cool,warm or insulated?

Nice way to mount it all!

Whoaooo! Nice “battery pack”… 5 hours is a very long session!! :wink:

I bought one of these UPS boards. It comes with a 3800mAh battery that played a MIDI loop on several Fluidsynth layers for 3.5 hours. It has various LED indications of status plus serial status updated every second with input status, output voltage & current battery capacity. It also has a GPI pin that goes low when battery is about to expire.

The main purpose is to decouple the PSU from the Zynthian, allowing current peaks to be delivered without the need for an oversized PSU. It also handles temporary loss of power but could be used for off-grid performance like busking. I am yet to test duration under load with external devices powered, e.g. USB MIDI controller. I am sceptical of its battery capacity measurement which sometimes continues to grow for some time after power is removed but the GPI seems valid.

It is pretty cheap and it might be worth adding a software module to monitor this (and other) UPS. I will knock something up.