I've used one of these, the stereo quality is good considering the price. But the low frequency is where I felt the difference in terms of audio quality between wired and wireless
Unfortunatly there is no way of turning of the voice. Its included by default in the sdk and usually manufacturers dont change much and just compile in the default template because it saves money and they wont need to hire programming people. Also the sdk is not really fully documented well. Some boards that dont have usb sound card functionality can still have it implemented in the firmware and board layout (becauss again manufacturers are lazy to desugn their own thing and use premade schematics) but they just dont place a resistor or jumper disconnecting the usb data lines but leaving pads that can be bridged. I had some models like that. Also if you do plan on tinkering with the firmware, they can be programmed using usb in DFU mode. You have to put a specific signal across the usb pins to put it into dfu mode. The Dfu mode is burned into the bootrom of the ic so you wont erase the functionality. The chips also use UBOOT as their bootloader. They use JieLi's sdk to compile and flash the code onto the flash
I have red one and its connection sound is like black one. But there is one issue, whenever I play audio it transmits a hiss along with audio even when volume is zero. One way to avoid it is a RC filter at output but that reduces the high frequency performance.
There is many bluetooth module with amplifier that used common power supply without any noise but when used tow seprated module with LC filter and short wires still there is ground loop noise
Yes, I have come across good ones, but all I've tested with a JieLi Bluetooth chip have had beeping noises. The better the speakers, the more you can hear them. CSR BT modules are much less noisy and have never had lady voices too
@@LeftyMaker comment was meant as constructive feedback ! It’s radio transmission 101, transmitters ideally need to be above ground or sea level to reduce *multi-path interference* and reduce *fresnel zone interference* having them higher than ground could have produced more meaningful result in real world scenarios
These ics dont really have any great documentation and it requires some digging. Also the number on the ics dont match with any datasheets and are likely firmware revisions and id number of the mfr. Most are from the JL ac69xxxx family
1:19 The "Bruh" brand PCB 😂
I've used one of these, the stereo quality is good considering the price. But the low frequency is where I felt the difference in terms of audio quality between wired and wireless
Unfortunatly there is no way of turning of the voice. Its included by default in the sdk and usually manufacturers dont change much and just compile in the default template because it saves money and they wont need to hire programming people. Also the sdk is not really fully documented well.
Some boards that dont have usb sound card functionality can still have it implemented in the firmware and board layout (becauss again manufacturers are lazy to desugn their own thing and use premade schematics) but they just dont place a resistor or jumper disconnecting the usb data lines but leaving pads that can be bridged. I had some models like that.
Also if you do plan on tinkering with the firmware, they can be programmed using usb in DFU mode. You have to put a specific signal across the usb pins to put it into dfu mode. The Dfu mode is burned into the bootrom of the ic so you wont erase the functionality. The chips also use UBOOT as their bootloader. They use JieLi's sdk to compile and flash the code onto the flash
Very useful info!
Great video! I was thinking of upgrading my old speakers so they would work with bluetooth
get the m18, it has key pinout for controls 😊
I have red one and its connection sound is like black one. But there is one issue, whenever I play audio it transmits a hiss along with audio even when volume is zero. One way to avoid it is a RC filter at output but that reduces the high frequency performance.
Good video and useful information
💯
There is many bluetooth module with amplifier that used common power supply without any noise but when used tow seprated module with LC filter and short wires still there is ground loop noise
Yes, I have come across good ones, but all I've tested with a JieLi Bluetooth chip have had beeping noises. The better the speakers, the more you can hear them. CSR BT modules are much less noisy and have never had lady voices too
You had the Bluetooth transmitter in the floor ! You should have tested the range when the transmitter was atlas 1.5 meters off the floor
is the floor lava or something?
@@LeftyMaker 🤦♀️
@@LeftyMaker comment was meant as constructive feedback ! It’s radio transmission 101, transmitters ideally need to be above ground or sea level to reduce *multi-path interference* and reduce *fresnel zone interference* having them higher than ground could have produced more meaningful result in real world scenarios
If I attach a rechargeable battery to it, can it get charged through the micro USB?3
No. You may even damage the battery by doing that
@@LeftyMaker Ohh so you can't solder a lithium battery to it! Thanks for letting me know
Hey, weird question ik, but do work as an engineer?
No. That's just a hobby
Can't find these JL ic data sheet 😭
search JieLi on LCSC.com and one/some of the chips there are probably on these boards
@@LeftyMaker I will try
Thank you😇 it work I was trying to find this manufacturer from long time
These ics dont really have any great documentation and it requires some digging. Also the number on the ics dont match with any datasheets and are likely firmware revisions and id number of the mfr. Most are from the JL ac69xxxx family
@@309electronics5 thanks❤️😇
But somehow almost every Bluetooth ICs are from them