Bluetooth 2.1 + EDR module for wireless headphones - TZT PCBA AUDIO - Test

What have you got with this stereo lately?
I made a special test. I "played" a 100Hz sine in one channel, and a 100Hz triangle in the other. It is undoubtedly stereo.

acctr wrote:

Poor test.

Why are we weak?

acctr wrote:

Play 100Hz sine in one channel and 99.5Hz sine in the other

I have no such possibility.

Prepare the appropriate file and send it, I will check it.

But you complain sometimes. :)

Please. A computer as a generator. 105Hz, sine in one channel, triangle in the other. I don't know how you can not hear the difference between these waveforms, I hear clearly. The signal was transmitted using a stereo BT transmitter with a built-in battery. You already know the receiver.



Anything else I can do?

For me, an important element of the test was missing, what are the delays in the signal?
Will he be able to watch a movie on the phone on headphones or will there be a distressed sound?

I have not yet encountered headphones that would introduce a delay (at least noticeable by a human, because there must be some). This receiver also does not show any deviations from the norm.
The problem of delays, with all headphones and transmitters, appears when, while watching a movie or, for example, playing on a computer, we cover the receiver's antenna with our hands, or turn our head in such a way that we lose range for a moment. If at this point we lose any data packet, the effect of "diverging" the sound with the picture will appear. If this happens, simply stop broadcasting for a few seconds and then resume it. Very often you can hear a soft click / crack or something similar in the headphones, indicating that the transmission is over. When we hear this sound, we can click "play" again and the sound will be synchronized with the video again.

While listening to music, this phenomenon does not bother us at all, if we add an image to the sound, and we have a poor range and lose it every time we turn our head, it can actually be tiring. The problem may also arise when the receiver is too close to the transmitter, because colloquially speaking, the signal may have "too small angle" to hit the receiver. Google how 2.4GHz waves spread and you will understand what I mean.

And you could provide a link to a specific offer on Ali or under what keywords exactly you were looking for this module, because for now the headphones themselves pop up or those large modules to which you still need to solder buttons and LEDs.

Was there any BT4.0 in the modules you tested?

bubu1769 wrote:

And you could provide a link to a specific offer on Ali or exactly what keywords you were looking for this module

I just entered Ali's search engine ... "TZT 1 pcs Bluetooth headset" and found it for $ 4, but if you try, you will probably find under $ 3.

miszczo997 wrote:

Was there any BT4.0 in the modules you tested?

I'm pretty sure it is, but I don't remember whether it's the receiver or the transmitter. However, if my memory serves me correctly, it was a module designed to be "soldered" to the proper PCB (containing uC) "for a sandwich", but I will not give my head. I'd have to search my resources.

I understand what's going on, nevertheless most of the BT speakers I had, despite being 1m from the laptop, the delay was still large enough that it was impossible to watch the movie, with a light hand of 300ms

From version 4.0, I have a transmitter:

https://pl.aliexpress.com/item/Mini-Server-Wi...-telefonu-PC-MP3-MP4-TV/32883883829.html?spm= a2g0s.9042311.0.0.27425c0f4zSR0m
but I will not know if it is 4.0, because how can I check it?

And two receivers:

https://en.aliexpress.com/item/JDY-10-Bluetoo...tible-with-CC2541-slave/32760976886.html?spm= a2g0s.9042311.0.0.27425c0f4zSR0m

https://pl.aliexpress.com/item/CFsunbird-Blue...IY-Bluetooth-module-4-0/32841003894.html?spm= a2g0s.9042311.0.0.27425c0f4zSR0m

But both require a UC to work. Of these "maintenance free dongli" all are 2.1 or 2.1 + EDR.

Added after 2 [minutes]:

Bullseye wrote:

300ms with a light hand

This is a tragedy.

I think you had some software or even hardware problem.

As for Bluetooth 4.1 receivers with EDR audio - stereo, you could test something like that. Link

I am glad that there are bluetooth modules, maybe one that will work and will appear in the shop.

Buy, send, I will check and describe. If you want, I will send it back to you later. Of course you cover the shipping costs ...

Or test and review yourself, because I have a lot of work anyway ...

If anything, write to PW.

CMS wrote:

And two receivers:

I admit that I was more interested in these 2 receivers after a cursory reading of their specifications, so I will wait for their reviews.
On the other hand, in what I found, it is probably impossible to change the onerous voice greeting.

I would like to ask about the noise. I have a mono Bluetooth headset, one for driving. It is silent. Do not listen to noise or squeaking. I tested a lot of stereo headphones and there this problem appeared. After pairing with the device, an unmerciful hum or squeal was heard. Same when playing softly. As you know, it is bothersome, did you also hear the hum here?

E8600 wrote:

so I'll wait for their reviews.

I don't plan.

adamos11 wrote:

After pairing with the device, an unmerciful hum or squeal was heard. Same when playing softly. As you know, it is bothersome, did you also hear the hum here?

I did not say anything like that.

How do you plan to stuff the system in the housing or maybe you print an additional one and want to stick it?

These are big headphones. There will be no problem with fitting the module and the battery.