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Unnamed Design by Lutkeveld (Development Thread)

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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Topic: Unnamed Design by Lutkeveld (Development Thread)
    Posted: 21 April 2020 at 2:58pm
Orders that are placed now are expected to ship out in 3 weeks :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jo bg Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 9:40am
Hi, how is it looking for orders? given the situation, can you guess a wait time if i put in an order for the amp module now?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Posted: 24 February 2020 at 4:15pm
TWS is the easiest way.
If you only need wired coupling, you can split the analog signal to both speakers.

If you also want to share the BT signal you would have to use I2S:
I2S -> convert to analog -> to other speaker -> convert to I2S

This should be possible, but I dont guarantee it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Monkeys Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2020 at 11:21am
Question:

What, if any, external wired signal sharing capacity does the Aio4CH have? I know it has an Aux input, but is there any way to have an Aux (or any other connection type) output?

For example if the device is receiving signal via Bluetooth and I wanted to link that signal to another powered speaker, is there any way to do that? Or is it only connection via the TWS bluetooth to another Aio4CH?

Don't tell me that the Aux input doubles as an output, that would be too perfect if it does haha.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2020 at 12:02pm
@Monkeys
Anything above 26.4V risks frying it, regardless of volume level.

6S is possible with that charger, just be sure to use a protection board with lithium. If you use a 5S battery you can use the BMS345 protection board (zoudio.com/product/bms345)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Monkeys Quote  Post ReplyReply Direct Link To This Post Posted: 11 February 2020 at 5:36am
Would one of these 22.2v LiPo batteries be suitable to run the AIO4CH? The maximum charge voltage is only 25.2v, so should be well within the limits of the AIO4CH and still provide enough voltage to almost reach full channel output.

https://www.banggood.com/ZOP-Power-22_2V-8000MAH-30C-6S-Lipo-Battery-XT60-Plug-For-RC-Quadcopter-FPV-p-990752.html?cur_warehouse=CN#jsReviewsWrap

And would connecting a LiPo battery charger such as the one below via the CHG port pose any issues?

https://www.ebay.com.au/itm/Lithium-Ion-Battery-Charger-Li-ion-LiPo-6S-21-6V-22-2V-25-2V-2A-Wall-Socket-ACDC-/321751878865
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Monkeys Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2020 at 10:17pm
That's great to hear that the charging is so simple =)

A little disappointing to hear that it doesn't easily handle 2 x 12v batteries as a '24v source' due to excessive voltage, but it sounds like it should be workable still.

What would be likely to happen to the unit if one were to power it with 28.4v? Would it just be likely to fry the unit straight away? Or would it only fry the unit if the amp channels were pushed to their maximum, exceeding the current handling capacity?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2020 at 3:50pm
@Xoc1

The chip that is used is the TAS5825M, a next generation device of the TPA3116 with integrated DSP. Music output power is similar to the TPA311x, with lower THD+N. However, for pure sine waves the TPA has more power, due to a higher thermal limit.

You would indeed limit output power by using a lower voltage, or lowering your maximum volume in the tool.

@93perezk
With the latest version you mean the speaker design as a whole? Because the amp itself is in its last version :)

@Monkeys
It is too simple, but you are right :) Just be careful with 2x12V batteries because they are 27.6V fully charged, which is higher than the 26.4V absolute max. If you limit your charge voltage to 26V, (13V per pack, using about 90% of the capacity), it would work. 

Also be sure to set the low power and shutdown power voltage. Then you can see when its almost empty (status LED = red), and it will shut down when the battery level is too low, preventing damage.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Monkeys Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2020 at 9:24am
Could someone advise how I would go about powering the AIO4CH with a 24v battery (2 x 12v in series) and also then charging the 2 x 12V batteries?

Looking at the manual it appears there are 2 power inputs, one called PSU and the other called CHG (presumably short for charge?).

I am assuming that the PSU input is where you connect the 24v battery, and the CHG inputs are where you wire the supplied power connector (which appears to be a standard power connection socket)? I would then assume that connecting a suitable 24v battery charger to through the power connector would supply power to the unit as well as charge the battery.

Is that correct? It seems too simple..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 93perezk Quote  Post ReplyReply Direct Link To This Post Posted: 09 February 2020 at 12:47am
I had following this project for a couple years, it looks pretty good and I'm really interested in get one of this when its last version come out. 
Congrats Lutkeveld for that unique design, well done.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xoc1 Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2020 at 9:44pm
Hi Trying to get some understanding of the available power from the AIO4CH board
Looking at the spec sheet
It says that power output is
4 channel class D amplifier (configurable as 2.0/2.1, similar music output power to the TPA3116
So looking at the TPA3116 spec
http://www.ti.com/lit/ds/symlink/tpa3116d2.pdf
 The audio output would be in a bridge mode as standard making the most of a single voltage rail supply. combining the channels is done in Parallel Bridge mode Hence the quoted doubling of output power.
As the outputs are running off a low voltage supply the maximum output power is realised by using lower impedance speakers
Spec curves say with
0.1% distortion Bridge Output BTL

8 ohms -12 V BTL = 8 W
4 ohms -12v BTL 16W
8 ohms  - 24V BTL = 34W
4 ohms - 21V BTL = 50W

Paralleled Bridge output PBTL


In parallel mode the chip can drive down to a 2 ohm load but output voltage is the same as in normal BTL mode so power increases are shown from using a lower impedance speaker.
Graphs are shown for a 3ohm load
This looks good for optimum output with a 24V supply


And a 2 ohm load

At these speaker loads the output needs to be limited. 21v PBTL 2 ohm = 100W

Is the limitation by using a lower voltage or would the software allow for limiting of the output?

I think a bit of clarity here will help users to get the best out of these class D amps.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Monkeys Quote  Post ReplyReply Direct Link To This Post Posted: 24 January 2020 at 9:45pm
This is perfect! Ill be ordering a pair of these 100% =)
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