TUTORIAL - Connecting PAM8403 to XY-BT-MINI (Ground Loop and Troubleshooting!) (Easy difficulty)

In this video I will show you how to connect the XY-BT-MINI bluetooth receiver to the PAM8403 module and to do some troubleshootings.
Review video of the XY-BT-MINI: • REVIEW - XY-BT-MINI Bl...
Review video of the PAM8403: • REVIEW - PAM8403 Class...
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[@SianaGearz]

On the PAM8403 board, audio ground is connected straight to power ground. Furthermore on the XY-BT-Mini boards that i see, audio GND is also part of the common power ground pour. Trying to connect both power ground and audio ground on either of them necessarily creates a ground loop, even if you're trying to star-ground them - this is not a true star-ground if you have redundant grounds! Just remove all the redundant ground wires, because you have still two ground loops left. Consider that there are existing capacitors in audio circuit. The 100uF ones on the BT board don't work to your disadvantage. There are however 1uF ceramic capacitors on audio inputs of the PAM board, which i think form a 7Hz highpass against the 22kOhm resistor, which i guess is par for the course, and tying down inputs with such a resistor to ground near device actually reduces noise by a LOT! Because input impedance of PAM is crazy high, so even a small stray current gets converted to a nontrivial amount of noise voltage. Anyway you can reduce component count and it's only going to improve. High pass filtering can be useful to reduce driver excursion and allow more volume, but under normal conditions, it's not an improvement, especially if not tuned to the speaker. Low pass to get rid of some RF interference can be super helpful though. An inductance in series with the speaker is also pretty futile - a speaker is already an inductor! Unless your added on inductance is so high that you swamp out the speaker inductance, which is just completely impractical, or unless it's similar enough to where you form an LCL filter. Also solderless breadboards are not to be trusted, i'm sure it's part of the issue with the test setup. Higher value bulk capacitance on power inputs is not always better. This is because lower value electrolytic capacitors have a lower ESR value as a rule. With this kind of project, i think about 100-470uF total would be perfectly fair, even better if you can distribute it among several capacitors.

[@nikibelov904]

Использовать провод от наушников (тонкий и экранированный) .. чем меньше проводов тем меньше шума

[@SianaGearz]

@@nikibelov904 headphone wires are not shielded. There's no point in them being shielded, since a headphone is purely a differential mode transducer and needs a substantial current to actuate. Also headphones are not sensitive to radio frequencies, active circuits are though. Microphone wire for active microphones is shielded though.

[@Helectronics]

Thank for this detailed comment, I don't know how I missed it, but now I respond. You are right, I made mistakes with the grounding, might try it again with your solution. I've put inductors because when I've measured the output with the oscilloscope, it was full of high frequency signals, so in order to do some measurement, including the output power, I had to add an inductor to filter out these high frequency signals. I know the breadboard is far inferior than a proper PCB, but for these kind of experiments it is really good.

[@hunter7ize]

This channel needs to get more attention

[@Helectronics]

Thanks for watching!

[@mdamirulaiman]

Amazing video with perfect explanation, this really helps me for troubleshooting my Bluetooth Speaker Project.

[@Helectronics]

Glad that my video could help you!

[@CCTVReport]

Can you do some test for me with XY-BT-MINI and CSR 4.0 on windows 10 ?

[@felipealves921]

Very good channel !

[@Helectronics]

Thank you!

[@reyjr3608]

Im learned something watching your video even im just a beginner..thanks👍😄

[@Helectronics]

Glad my video could help, thanks for watching!

[@reyjr3608]

@@Helectronics if u please, can you do review about wuzhi audio 50w amp zk-502L?

[@Helectronics]

If I order the board, it takes at least 2 months to get to Romania. So I don't think I can make a video of it soon, maybe later.

[@reyjr3608]

@@Helectronics woah.i didn't know you live that far away.sry for a blunt request. But,Thank you anyway .. Meanwhile what's your new upcoming projects video?.. it must be interesting.keep it up 👍😄

[@pureview9286]

it's work.. thank you

[@eduazasmax]

like 93 , eu também percebi que só usando a placa diretamente no circuito tem ruídos ,e realmente necessário adicionar filtros ,congrat.

[@artucast]

Hi. Great video. Can it charge the battery? or i need to add a tp4056?? thanks

[@Helectronics]

Hi, if the Li-ion battery has no built in protection circuit then I highly recommend using a tp4056 module. Thanks for watching!

[@anggorotriatmojo1200]

Thx, really help

[@Helectronics]

Thanks for watching!

[@thegeekclash8179]

You are awesome

[@Helectronics]

Thanks for watching!

[@thegeekclash8179]

Can i place a 600ohm isolator transformer .

[@Helectronics]

You can try it.

[@davidurbina3874]

power supply switching frequency 60 khz it is necesary?or can you just connect the amplifier directly to bluetooth?

[@Helectronics]

Not at all, you can power these board with batteries to get even better quality output. The 60kHz switching freq of the power supply should be eliminated somehow to achieve better output quality.

[@davidurbina3874]

@@Helectronics then you can connect the plates between them directly and nothing will happen?

[@davidurbina3874]

@@Helectronics and can those circuits be joined as in this video? https: //kzbin.info/www/bejne/mpukqKl7j9R6Y5o

[@Helectronics]

If you connect both board to the same power supply, a ground loop will be created and they would generate noise as seen in the video, that's why you need to experiment with the connections.

[@Helectronics]

@@davidurbina3874 You can, but if you pay attention you can hear that the output sound is not clean, moreover you need to use a BMS module (battery management system) to protect the battery from overdischarge and accidental short circuit. The PAM8403 board has no built in battery protection circuit. The guy just soldered the battery to the modules direcly which is dangerous, also an on-off switch would be also handy if the circuit or battery catches fire haha.

[@M4XD4B0ZZ]

Sorry it is kind of off-topic to this video but I have seen that you and a lot of your viewers are actually really knowledgeable in matters of Bluetooth stuff so I thought I contact you guys.. I want to make my livingroom Audio devices wireless (I heard Bluetooth is better suited than wifi?) and thought I would need to buy a transmitter board for every device (vinyl player, DVD player, amplifiers and a tuner so four Boards?) and then I need to get a receiver which will receive all the Bluetooth signals. I connect the output of the receiver to my speakers and subs at last and should be fine right? Please someone help me out with this I am so confused.. Thanks guys, stay well oh and nice video btw

[@Helectronics]

It's not off topic if it's about electronics. Also, thank you for watching and for the kind words. What you want to make is possible by using Arduino with bluetooth transmitter and receiver module, but I haven't tested one of that so I can't really help with that.

[@M4XD4B0ZZ]

@@Helectronics thanks for reaching out

[@slva2000]

Обошёлся феритовым кольцом (две катушки на + и -) по питанию модуля.

[@qwiy5955]

откуда у тебя этот динамик?? это же 1гд-36 или что-то похожее

[@Helectronics]

I've got that speaker from an old TV more than 15 years ago.

[@IceJackal1984]

this is not a good solution

[@Helectronics]

It is good, but the ground isolator is better