YJ 3116 Bluetooth problem

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#3
The amp gets muted by GPIO from the BT module, i'd guess. Thats why the whining stops when the stream is paused.

Have you tried another power supply? Is the supply you used one with earth connection? (like 3 pin)

Have you tried running the mac on battery only?

It sounds like supply problem.
 
#4
Here in the U.S., Parts Express is selling many similar boards that are bad designs. I tried 3 different class D boards and two of them had oscillation problems rendering them useless. The posted reviews said they were fantastic... I don't think Parts Express actually tests their products, and I doubt if many of the reviews are legit.
 
#5
So far I have tried 2 of the 4 amps I purchased with 3 different grounded ps. 15-19V as well as my Mac and cell phone. It’s pretty much the same all the time. Waiting for YJ to respond to my email.

Are there any Bluetooth amps that work well. I have tried 4 of them and can’t say as any to them compare to their wired counterparts either 3110, 3116, or the TPA boards.
 
#6
One of my theories/conspiracies is that these cheap modules are manufactured for TVs, boomboxes, etc in big batches, and then are rejected by the client, or never make it past their own QC, but good enough to be sold on ebay, because the problem my be slight, and if it is substantial then few people will have the stamina to get their money back on a $10-$20 module, or the knowledge and skill to fix it (hey doctormord).

I got a couple of bluetooth modules with the TDA7498 which sounded pretty quiet, but ran a little warmer.

just had a quick look, can't see the those modules anymore, but this one came up, and I recognize the layout with the buttons, they were selling separate laser cut clear diy plexi cases for these, but the fully assembled NOBsound style aluminium box is a good step up. tempting.

http://www.ebay.com.au/itm/Bluetoot...934717?hash=item1c77ad5dbd:g:nCcAAOSwA3dYcfdq
 
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#10
ive not had those problems described in that video.

hmm note that if your are unpluging one of the pcb connectors that you need to be careful as there very stiff and i feel one risks damaging the plug to wire connections. so i use pliers to the plug out if i have too.

What does bug me about the board is where is the 24V boost converter? when using there Li-ion 3S battery board, the amp board is only getting 12.6v at best. so unless theres a tiny boost converter that is beyond my understanding and expectations somehow on the board, i dont see whats on the board to boost the voltage to 24V. so i guess they don’t have a boost converter. hmm I really don’t know.
 
#12
They describe some extra or alt features in the manual and i tried asking for doc so i could make use of them. as they are not the default configuration features but no answer was given, so unless you make a very big order to bribe them into giving you info and doc. you have to treat what you get a sort of demo board which you use as is.
 
#14
Sounds like an on board ground loop to me. The Bluetooth unit doesn't operate at the source voltage. There's a regulated supply for the Bluetooth and I imagine its on the Bluetooth board. The isolation is breeched somewhere..
 
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