REVIEW - SANWU® Stereo Bluetooth Amplifier (SW-HF69B V1.1)

In this video I will review the Sanwu stereo bluetooth amplifier.
You can buy it here: www.aliexpress.com/item/32891...
JieLi AC6905 official site (chinese language): www.zh-jieli.com/
AC6905A Datasheet: img005.hc360.cn/k1/M09/34/E3/w...
Another datasheet for AC6905: www.chenbingdom.com/uploadfile...
Datasheet for HT8692: datasheet.lcsc.com/szlcsc/Jia...
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If this video helped you or you want to see more videos like this, then please consider donating few cents here: paypal.me/Helectronics
My regular videos include:
-Amplifiers • AMPLIFIERS
-Bluetooth • BLUETOOTH
-Builds • BUILDS
-Offtopic • OFFTOPIC
-One minute tutorials • ONE MINUTE TUTORIALS
-Presentations • PRESENTATIONS
-Reviews • REVIEWS
-Teardowns • TEARDOWNS
-Tutorials • TUTORIALS
-Unboxing • UNBOXING
of electronics!
Thank you for watching!

[@mattlaptop5728]

Excellent video and explanation - thanks for taking the time to share it.

[@Helectronics]

Thanks for watching!

[@tossancuyota7848]

love this guy hes through on testing you got a subscriber here u w u

[@LeonardodeJesusMiron]

Thank you very much for this professional review! Subscribed!

[@Helectronics]

Thank you for the kind words!

[@IustinNitza]

Thanks!

[@secardoindia5374]

Your video proper details 😮

[@user-xb4nn6ql5l]

This is a proper review - thank you. What scope are you using?

[@Helectronics]

SainSmart DSO202 Note II oscilloscope, thanks for watching!

[@sachinrajput1768]

Any equivalent chip for ac6905a??

[@sayedsaeedjazaeri4483]

Thank you for your helpful video, I wanted to ask a question about the module itself do you have any schematic file or somethings same for that? I want design this whole module myself with Altium Designer. what do you recommend? Thanks and regards

[@Helectronics]

Sorry but I do not have a schematic. It would take too much time, also it's not the best module. With 4 ohm speakers the output is too weak, the module shuts down too early, not even exceeding 2-3 watts

[@us7876]

Great video ❤ I have a pair of 4ohm 6w speakers and have discarded my all-in-one PAM8403 amp (2x5w) because it doesn't give enough power to move passive radiators. It also shuts down around 70% volume... Would the HF69B be a good replacement? I'd like to make it portable with a single 18650 thank you!

[@Helectronics]

Unfortunately this module has the same issue with the 4 ohm speakers. At around 70-80% volume stops working and restarts. A viewer also had the same problem with this module.

[@johnreyfrancisco8461]

Great explanation Do you also measured what is maximum input voltage?

[@Helectronics]

Thank you, do you refer to the supply voltage? I haven't measured, probably it would damage the board to test that. I've given 5.5 volt and worked without a problem, but I do not recommend this board, instead an XY-BT-Mini with a PAM8406 works a lot better.

[@delta7id]

what do you think is the best best 5v amp ? I have a 5v amp, the sound is very good, it's just that 1 ic is broken and it's very difficult to get the ic

[@Helectronics]

I've used recently the PAM8406 and it was good enough, even better than this expensive amp. It is cheap and reliable. Thanks for watching!

[@ahmedelsalleh6265]

thanks for the review. my home speaker's board just broke and im searching for a cheap fix for it instead of buying a new speaker so I have the 18650 battery and 2 x 3w speakers. can this be a good all in one blutooth module to replace it with ? the board used in the speaker for the manufacturer is BK3266

[@Helectronics]

Thanks for watching! This board might be too powerful for 3w speakers, I recommend the DW-CT14+ board. That is also bluetooth amplifier board, you can see a review video on my channel.

[@ahmedelsalleh6265]

Thanks alot, I just rechecked my speakers and they are 5 w 4 ohm, which module do you recommend for me, thanks again ))

[@Helectronics]

You may use the Sanwu, if you have more money then you can try this one. It requires a 5V 2A adaptor, and if you want, you can use a Li-Ion battery, but use also protection board too.

[@rogercox6020]

Did you do any experiment running the amp from the battery, when the battery was at a low voltage (i.e. say 3.4V)? I tested several boards and all displayed breakthrough at less than 3.7V. I had some original boards (Bluetooth circuitry embedded into board, not on the red module) and they did not have this problem. In the end I had to use a boost converter on the battery to boost the voltage to 5V and a separate battery charger module. The sound was excellent on that set up using two Visaton FRS5X 8 ohm speakers in a wooden case with a passive bass radiator.

[@Helectronics]

In the video I tested the lowest supply voltage and at 3.4 volts it shuts down (8:40 in the video). I haven't tried it with battery but my next video will be about a bluetooth speaker build and this board will be used with Li-Ion battery. When I will build it and test it then I will be able to give answer to your question. Thanks for watching!

[@Helectronics]

The original boards are well designed, big companies invest a lot of money to design great circuits. (Like JBL or Sony)

[@Helectronics]

You should make a video about your bluetooth speaker, the Visaton speakers are good.

[@rogercox6020]

I have a video of the issue which I can send to you (need your e-mail as I didn’t use non copyright music). The issue was there with a battery voltage of 3.7v. The amplifier didn’t shut down. With a battery at full charge (4.2v) the breakthrough was not noticeable (not in video). If I remember correctly from my little bit of reverse engineering, the Bluetooth module board was powered directly from the battery but the amplifier IC’s had 5v on them so I assumed that there was some sort of boost circuitry for their power. However, I didn’t spend much time on it so may not have analysed it correctly. (On usb power the 5V would have gone to both so there would not be any possible mismatch of signal levels). I still have one of the original boards (which had no breakthrough issue at all) but I think it developed a fault in the battery charge circuit so I ordered some more and received the red module ones.

[@rogercox6020]

@@Helectronics For completeness I looked at the power side of the original board compared to the latest one. The original board did not have the on/off switch. On this board the USB input does not go directly to the electronics on the board. It is routed through the battery charge circuitry (shottky diode and what looks like a MOSFET). The result is that the supply voltage (to the circuitry) is actually around 4.5V and if a battery is plugged in then the charging current takes up a proportion of the current available for the overall board. The newer board has the slide switch. In the OFF position the board will be OFF unless a supply is plugged into the USB connector (and then it is ON!). If a battery is also plugged in, the charging circuit will also operate and charge the battery, but the board as a whole will now be operating directly from the 5V supply. When the switch is in the ON position, the device will operate from the battery at whatever the battery volts are at the time. If a supply is plugged into the USB connector then the battery will charge at the same time as the 5V is supplied to the rest of the circuitry. So, the purpose of the slide switch is to ensure that the circuitry can work directly from the USB (5V) supply if a battery is not connected, rather than only via the battery charge circuitry. I don’t think any of this explains the breakthrough that I observed though! The only real difference between the boards is the switch and the change to the red module.

[@ox_m4648]

İs the circuit microcontroller???

[@Helectronics]

What do you mean? This is a stereo class D audio amplifier with bluetooth receiver.

[@hannahayessavillanueva5696]

is it okay if i use 8ohms 20watts speaker?

[@Helectronics]

Yes, it is good. Thanks for watching!

[@Vijaykumargupta1122]

Hello I had purchased this module but unfortunately I ruined it's Bluetooth section so can you pls tell how I can again use it by an aux cable or another Bluetooth module since it is quite expensive at least for me that's why I didn't want to waste it.

[@Helectronics]

Hi, I can't give a sure answer but you can try to replace the bluetooth part, or to connect a different bluetooth receiver module's outputs to the input of the Amplifier ICs.

[@Helectronics]

At 2:26 it is shown where the inputs of the amplifier ICs are. It is the pin 13 for both ICs.

[@Vijaykumargupta1122]

Ok thank you for your help

[@Helectronics]

You're welcome, thanks for watching!

[@sabyasachimaji344]

Can I use 3.7 volt 5000mAm battery?

[@Helectronics]

Yes.

[@minhphungo2092]

i use 2 speakers 6 ohm/6W. 5V/3A power supply. but it's still buzzing. Do you have a way to fix that problem? Thanks

[@Helectronics]

Hi, is it buzzing sound or hissing sound?

[@Helectronics]

What kind of power supply do you use? Have you tried to use Li-Ion battery with protection circuit?

[@minhphungo2092]

is it buzzing @@Helectronics

[@minhphungo2092]

@@Helectronics I use power supply Switching 5V/5A to test

[@Helectronics]

Try to use a big value capacitor at the power supply, a 4700uF or 10000uF, or try to use other power supply.

[@reyjr3608]

Woahh..interesting.. watching your videos is like a Csi plus MacGyver in electronic..👍😄. Im here coz im trying to researching and make a diy Bluetooth speaker.. Technically,im a beginner in electronic. Just starting to understand.and i learned something in ur video. If u please, Can you review the wuzhi audio 50w.. Zk-502L please.. Thanks.. =)

[@Helectronics]

Thanks for the kind words. Now I'm actually making a video of a bluetooth speaker using this module, stay tuned the video comes in a few days.

[@reyjr3608]

@@Helectronics yeah yeah... detective Sherlectronics holmes is on the move 🔎😄👍

[@Helectronics]

My latest video about the bluetooth speaker is released now!

[@sentzzjmr6871]

plz tell me how to reduce volume

[@Helectronics]

This module has no volume control, you can control the volume from the source device, for example: phone.

[@cinderelladreamshop1310]

4 ohm, 8 watt speaker perfectly play?

[@Helectronics]

Yes, but won't work on full volume. This module has some kind of problem, with 4 ohm speakers it tends to turn off on high volume. Probably work better with 8 ohm speakers.

[@cinderelladreamshop1310]

Thank you for Instant reply

[@Helectronics]

Thank you for watching!

[@nizamudeenmohammed8898]

Shall we Use 10W speakers but the Board mentioned Max 6w each port Please let if know if I use 10w will it risk?

[@Helectronics]

Using a better power rated speaker does nothing, you can even use a 100w speaker with this amplifier. The problem is when it is reverse, so the amplifier output is 6 watt and the speaker is 3 watt, it can burn out the speaker.

[@nizamudeenmohammed8898]

@@Helectronics Reverse means?

[@Helectronics]

Vice versa

[@nizamudeenmohammed8898]

@@Helectronics if We use less speaker watts it will burn out?

[@Helectronics]

Yes, it can burn out the speaker.

[@tng_fix9274]

I have board like that, Can you fix noise

[@Helectronics]

What kind of noise does it make?

[@tng_fix9274]

Humming noise when using low volume Like "zzzzzzzzzzzz.zzzzzzzzzzzzz"

[@Helectronics]

Are you using Li-Ion battery or USB adapter to power the board?

[@tng_fix9274]

But just only left Chanel had some noise

[@tng_fix9274]

@@Helectronics I'm using both

[@user-cu5cq3iv5v]

Антенна очень странная. Подключена длинной извилистой дорожкой, да еще через переходную плату. На 2,4 ГГц такое не прокатывает.