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ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth

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#501
superlian said:
Thx justanalogue.

These kind of rural cabins is not that expensive i Norway either. And the location and view is often much much better than in the established luxury cabin areas. But you have to carry water, du your business outside in a cold outhouse, empty the loo every second year and dig a big hole in the ground and put it there. Then i have a fuel aggregate to topfill the batteries in the very dark winter, a diesel oven, two fireovens, a small propane fridge, propan cooker……well you need to be Mcgyver, its a lot to do. Did i mention chopping wood? 🙂
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Still a very nice hide away place!
 
#503
I think so. That happened to one of mine. I was sent the firmware file after making contact about my situation and used the same UI to upload. AIO4CH came right back to operation and has been so ever since. I think I messed it while trying to upload a new filter while it was playing music... Now I unplug the main power supply before uploading filters...That's not going to happen again.
 
#505
pinae said:
I used ZOUDIO aio4ch to power two satellites and a subwoofer. The subwoofer uses Channel 3 and 4 in combination. I was able to configure the system with mono input (the stereo firmware update was not available yet) and it worked like a charm! The bluetooth module was a convenient source for the signal and with some measurements and a couple of filters the whole setup sounded very nice.

The idea was to install the amplifier board with its 24V power supply in the back of the subwoofer. The volume should always stay at maximum because I wanted to control the volume from the source (smartphone or PC). I was not concerned about overheating because the specs of the board say it has a thermal protection.

The setup worked quite good for about two hours (enough time for several measurements and adjustments). After that it suddenly stopped to make any sound. The amplifier chip seemed to have burned through.

I returned the board and I got a replacement without trouble (thanks for that!). I thought the board must have hat a manufacturing error which ouccurs randomly. This is no big deal if it is replaced swiftly and without problems.
So after I got the replacement board I reinstalled the whole setup and again it worked flawlessly and sounded quite good. I measured and adjusted again for about 1:30h. After that the speakers suddenly failed. The error was not exactly the same as with the first board because the subwoofer was still working. But the second board seemed to have failed in a very similar way.

Again I got a replacement. I appreciate this very much! However after loosing two boards I wonder if the problem really was a random manufacturing error. What if the thermal protection is not working? Should I add some heatsinks to the amplifier chips? Could there be a wiring issue that destroys the board after running perfectly for more than an hour?

Before I wire up the new board I wanted to ask for your opinions on this topic. I think I made no mistake with the wiring (it worked after all) but maybe I'm missing something. I do not want to loose another amplifier...
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I'd try a lower voltage power supply, perhaps a laptop computer brick at 19V. Also dont set the volume at maximum. Any mistake on the smartphone / pc end could stress the amplifier. I run mine full volume (bit perfect...) on the source end and use the amplifier volume control to set as loud as I'd ever want (not full...) then introduce the volume control at the source to further reduce the level and make it convenient.

Perhaps the combination of near max PSU voltage with max volume is putting the design over the top thermally. I thought the chip was supposed to back off on the output level automatically as it got hot - an arrangement to save itself and allow music to still play - some. It would be interesting to inspect the failure; too bad you didnt show pictures of what "burned through" looks like.
 
#507
@dublin78
6S li-ion should be no problem.
Send me an email at info@zoudio and we'll look for a solution.

@ACE monitors
Thanks Jimmy!

@opwierde
Release date is targeted for the 14th of januari.

@jjasniew
Great work! Hopefully with the AIO438 it will even be possible directly via the onboard USB port
via a future firmware update.

@pinae
Can you send a picture of your wiring to info@zoudio.com.
I will have a look if I see anything out out of the ordinary.

@sbrindignigni
No it's actually supported in this case. The amp output is a 'Bridge Tied Load',
which can be combined by wiring it to a 'Parallel Bridge Tied Load' configuration.

@superlian
You cannot 'draw' voltage, you 'draw' current.
If the voltage drops, its an indication it cannot deliver the needed current.
The last log you sent looks fine, what is exactly the problem now?
Does it work and is it just that it does not automatically boot when power is applied?
 
#517
If you go to the zoudio website you can download the programming software which you can use with the small usb programming pcb which connects to the main pcb. Please see the attached image.
If you didn't buy the small programming interface pcb you should be able to contact them and order one
 

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#518
@fb
Yes, there is a 3 pin JST-PH header available for I2S

@cheapvega
The encoder itself is pretty generic, it's only the carrier board that is a bit proprietary.

@Defo
Jjasniew is correct, it's only 2ohm stable in PBTL (called 'single output' in the configtool).

@peppennino
That is correct. We already got it working in a test setup, but it's disabled for now.
Once this feature is tested more, it will be rolled out via a software update.

@cheapvega @raymondj
The connection on the picture is indeed the right one. The programmer is always included in the package by default.
 
#519
Copy of the email that got sent out to everyone that pre-ordered:
-----------------

The last few weeks have been busy, but for good reasons!
The new hardware is slowly rolling off the production line.
Firmware is finished and the configuration tool will be finished this weekend.
Some modules have already been shipped out to developers,
but next week we will start sending out the regular pre-orders.

The shipping schedule is as follows:
  • Orders up to 14 november: next week
  • Orders up to 14 december: in 2 weeks
  • Orders up to 14 januari: in 3 weeks

We are very excited about the AIO438, we hope you are too.
If you have any question or remarks, let us know!
 

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