MP3 project - KVAZAR (we make a losless player based on the JieLi BR 17 module)

Good afternoon (optional evening / night).
On the expanses of the Chinese Internet, I onceI got this board, and the manufacturer declares support for FLAC, and since I haven’t met reviews on it, and the reviews were extremely laudable, it’s not clear why I bought it, because the cost is extremely funny, as in general for all Jie li codecs , but is it worth it to buy it looking under the cat (I will say right away I even planned to make a player on it, the attempt failed, a sad experience)

Preface free time, I slowlyI threw up the player's circuitry on this codec (I took this board under the razderban) and at the same time decided to gut it all, Jie li is not enough material for codecs, everyone says they’re hard to find the schemes and manuals, but I was lucky to find the pinout of the chip (on Wildly Chinese resource, I will give the link below).
In general, no review, but perhaps a good one.report will pull. I took it in the hope of making a certain clone of the “Nut” player, but I’ll say right away that this codec doesn’t need a flask, but it’s not worth taking for HI-FI, for all boomboxers it may come down, but for good sound, let's say so-so ...
As usual warning:

All responsibility, namely independent penetration into the body of the finished product with the subsequent violation of its integrity of efficiency, lies with the person who committed this action.
Appearance
The dimensions of this module are not large 45 x 40 mm, and it can easily be integrated into almost any device and even wearable.


Stereo speakers up to 8 ohms organized by a pair of amplifier circuits 8002.

A slot for a memory card, a flash drive, and USB connectors are extremely cheap and not durable for sure:



Wired IR receiver to work with the remote:

Nest under 3.5 pass-through and also extremely cheap and unreliable:

Included is a remote (without batteries LR1130 - 2 pieces):

For some reason, the manufacturer JieLi, keeps in the strictest confidence schemes for its modules, for some of them can be found hereAs for this module, it is built on the AC6905A chip.

Datasheet will not, there is only fragmentary information, which is confirmed by this image:

The characteristics of the module are as follows (those that correspond to reality):
1. support Bluetooth 4.1,
2. Apt-X is absent,
3. it is possible to connect stereo speakers at 3W at 4 Ohm and 1.5 at 8 Ohm,
4. it is possible to control the module from the remote,
5. it is possible to install buttons
6. Support for memory cards and flash drives (checked only up to 32GB),
7. Support flash drives (with no memory card, checked up to 16GB)
8. USB DAC,
9. Ability to connect headphones.
10. As well as the following support A2DP / AVCTP / AVDTP / AVRCP / HFP
In general, a fairly decent set of features for such a board, although of rather dubious quality, will be digging the whole thing down.
First start
And so, the module has 2 micro usb connectors, whichallow you to feed from one only, from the other to receive, as well as control the signal from the computer (sound card), very well. It’s just not interesting to feed the mouth, let's stick it in the PC.
When connecting, the drivers are installed automatically and the following is visible in the dispatcher:

By the way, this module also has a microphone, that is, a logical conclusion - you can connect.

The functionality of a sound card is limited by the following thresholds:

The sampling rate is only 16 bits at 48 kHz. Oh well, strange losless is obtained.
The standard sound effect management features in Windows are supported:

In general, connecting via cable you will have a sound card.

LED of course - blue 8)
Control
Separately, you can say about the management:
There are 3 modes in the mouth:
1. blue tooth,
2. sound card
3. player.
Through the blue tooth the mouth is determined immediately and witheasily connects to the us-you in the form of a sound amplifier. The sound goes, all is well. By the way, the sound is not much different from the sound card mode. Yes, no. Apt-X, yes and to hell with it, yet the mouth of the lower price segment.
Switching modes is possible through the control panel, or the keyboard is connected separately.
There is an equalizer, about 5 preset presets, and so, never turn it on, just believe, well, so-so possibility, which just incredibly degrades the sound.
MODE key, sets the mode, the RPT buttonThe repeat mode is turned on, and the U / SD button switches the media type. There is a button PLAY / PAUSE, volume and track switching keys, as well as using the numeric keys, you can switch along the tracks, there is a MUTE mode - mute.
Transmission distance from the source to this modulebluetooth on 10 meters, without interruptions and blunts, and on the earlier chips, which the Chinese really like to put the signal in “inexpensive headsets” very “walk”, then everything is fine ...
When connected with an inserted card, it is possible to use the means of the processor itself to write / copy to it. True speed is quite sad:

Oh yeah, there is a built-in Chinese woman who is shouting Bluetooth mode in her ear and things like that 8D.
Sound
I am not an audiophile, but a music lover and I like a good sound, so let's go through the following set (to take 3 completely different compositions, not to tire, and also in different formats):
1. Perhaps my favorite album Acoustic alchemy:

The composition is called Homecoming, format and discretization in the image below:

2. Gorillaz:

The composition is called Re-Hash, the format and discretization in the image below:

And as finishing (Fatality) Rammstein took:

The composition is called Paris, format and discretization in the image below:

In general, three tracks of different quality: FLAC 16 bit 44 kHz, AAC and FLAC 24 bit 192 kHz:
1. 16 bits, the flight is normal, everything is fine track goes and sounds great,
2. AAS, everything is fine, the track goes and sounds great,
3. 24 bits and here I had an incident, the track goes, sounds, but slows down.
It is a pity but losless above 16 bits this module does not pull.
Feels like:
First I plugged in the headphones (Technics RP-F600) in3.5 connector, let's say it plays but not very pleasantly, the sound is flat, some kind of soulless something, I did not like it. Through bluetooth plays the same way, flat and unpleasant.
After listening to all this garbage, I decided to connect toloudspeaker outputs, yes yes, there are 8 ohms, and I turn on 50 ohms of load, but nothing the board quietly sings, it's not stressful, it's generally audible and much nicer than directly, and why i’ll show you why:
After listening decided to connect toOscilloscope - DSO 138 meter. In general, it is enough for all sorts of such checks, but I don’t consider it a good oscilloscope, then it’s like a meter. Go:
To generate a sine, triangular,meander was used program - Arta. For such a board, as practice has shown, it is enough to check at 1 kHz, 5kHz, 10 kHz. All that is higher will have the form of a sine no matter what type of signal I choose.
1. We take readings 1 kHz from 3.5 - sine:

2. We take readings 1 kHz from 3.5 - triangular:

3. We take readings 1 kHz from 3.5 - meander:

Well, everything is relatively good, even though the sine and triangular harmonics are protruding, in general, 1kHz of norms.
4. We take readings 5 ​​kHz from 3.5 - sine:

5. We take readings 5 ​​kHz with 3.5 - triangular:

6. We take readings 5 ​​kHz from 3.5 - meander:

And it was here that everything floated, well, let's look beyond 10 kHz:
7. We take readings 10 kHz from 3.5 - sine:

8. We take readings 10 kHz with 3.5 - triangular:

9. We take readings 10 kHz from 3.5 - meander:

Well, you understand, if the meander has the form of a sine, well, I don’t even know where to put such a codec:
Let's look at the waveforms from the output of 8002, well, so for the sake of interest:
1. We take readings 1 kHz from 8002 - sine:

2. We take readings 1 kHz from 8002 - triangular:

3. We take readings 1 kHz from 8002 - meander:

And that, not bad, smoothes, but this is the frequency of 1kHz, who needs it, so the test signal and no more. We continue:
4. We take readings 5 ​​kHz from 8002 - sine:

5. We take readings 5 ​​kHz from 8002 - triangular:

6. We take readings 5 ​​kHz from 8002 - meander:

Well, anyway, the meander sailed away again, but still it is a rather complicated signal.
7. We take readings 10 kHz from 8002 - sine:

8. We take readings 10 kHz from 8002 - triangular:

9. We take readings 10 kHz from 8002 - meander:

Further testing makes no sense after 10kHz signals are similar to each other, for example, this module is connected to my self-made amp after 3.5 at a frequency of 10kHz, the meander has the following signal:

Much better than 8002 and more, than on the built-in amplifier AC6905A.
In a word, like a sound card, shit, like a player for HI-FI, too, but that didn’t stop me and I decided to draw a scheme for the whole thing and at the same time gut the whole module and make my own.
Open MP3 project KVAZAR
Having played enough with the module I decided to unsolder it oncomponents. I didn’t need Bluetooth because of the use of the aluminum case, I didn’t need IR either, we can refuse the USB Host connector for flash drives. Thereby, I greatly reduced the volume of the device and was able to fit it into a standard case - the “walnut” type.
Painted where some values ​​on the original board (described capacitors and inductors that are not visible to the eye):
C1 - 1.8 uF
C2 - not available
C3 - 680 nF
C4 - 1.8 uF
C5 - not available
C6 - 1.8 uF
C7 - 680 nF
C8 - 47 uF
C9 - not available
C10 - not available
C11 - 1.8 uF
C12 - 1.8 uF
C13 - 1.8 uF
C14 - 1.8 uF
C15 - 100 nF
C16 - 680 nF
C17 - 680 nF
C18 - 6.3 uF
C19 - 6.3 uF
U1 - AC6905A
L4 - 2.7uH
L5 - 2.7UH
The resistors see everything there without problems.
In Splan drew the following scheme of the device:

List of items:
Scroll
A1 = OPA2134PA
A2 = OPA2134PA
C1 = 0.1
C2 = 300uF 25v
C3 = 2.2uF 16v
C4 = 4u7 25v
C5 = 4u7 25v
C6 = 4n7
C7 = 4n7
C8 = 2.2uF 16v
C9 = 10uF16v
C10 = 10uF16v
C11 = 22u
C12 = 22u
C15 = 10u
C16 = 10u
C17 = 680nF
C18 = 680nF
C21 = 47uF
C22 = 100nF
C23 = 1.8uF
C24 = 1.8uF
C25 = 1.8uF
HL1 = Led green
HL2 = Led red
L1 = 22uH
L2 = 2.7uH
L3 = 2.7uH
R1 = 220k
R2 = 220k
R3 = 220k
R4 = 220k
R5 = 1k
R6 = 1k
R7 = 1k
R8 = 1k
R9 = B50k
R10 = B50k
R11 = 100
R13 = 2.2k
R14 = 0
R15 = 3k
R16 = 6.2k
R17 = 9.1k
R18 = 24k
R19 = 33k
R20 = 1.2k
R21 = 400
R22 = 1k
R23 = 1k
R24 = 47k
R25 = 332
R26 = 4R7
R27 = 2.2k
SA1 = Btn 6x6x4.3
SA2 = Btn 6x6x4.3
SA3 = Btn 6x6x4.3
SA4 = Btn 6x6x4.3
SA5 = Btn 6x6x4.3
SA6 = Btn 6x6x4.3
SB1 = B50k
VD1 = SS34
B1 = 4.2V
In general, I will not describe the system of LUT, as I already described it in the review about the Spectrum, at the output I received such a device:


I will say this, playing and singing. I do not like. Well, sometimes, he created Frankinstein and buried him under the table cover.
Who wants to get tired of making can send wiring roads, like there was still a template.
In general, if you absolutely do not care what and how it plays, you can take it boldly for handicrafts. The flak to this processor, like a dog's fifth leg, plays 16 bits only. In general, I had fun as I could 8)
Everyone decides for himself whether or not to take this module.
PS: The board of the first quasar looked like this:



Update: