Hello,
I've recently got a 5V bluetooth receiver audio board to play music remotly to my speakers, before I soldered the power I tested it via a 5V phone charger and it worked fine..
When plugged into the DC-DC step down board the BT receiver board is making first high frequency noises and then it's just buzzing.
Any ideas how I could fix that problem?
Bluetooth board:VHM 314 Bluetooth Audio Receiver board Bluetooth 5.0 mp3 lossless decoder board Wireless Stereo Music Module-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group
Wiring diagram:
I've recently got a 5V bluetooth receiver audio board to play music remotly to my speakers, before I soldered the power I tested it via a 5V phone charger and it worked fine..
When plugged into the DC-DC step down board the BT receiver board is making first high frequency noises and then it's just buzzing.
Any ideas how I could fix that problem?
Bluetooth board:VHM 314 Bluetooth Audio Receiver board Bluetooth 5.0 mp3 lossless decoder board Wireless Stereo Music Module-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group
Wiring diagram:
Do you have any test equipment?
Assuming the BT board consumes little power, are you willing to replace the regulator with something simpler, like a RZC?
Assuming the BT board consumes little power, are you willing to replace the regulator with something simpler, like a RZC?
I have a multimeter and ampere clamps if that is what you mean by equipment.
Also what do you mean by RZC, googling it shows nothing related to electronics?
The meter is a start but I was hoping for a scope. Resistor, Zener, Capacitor, the simplest Voltage regulator.
So do you have any thoughts? Do you suspect malfunction, instability or EMI?
So do you have any thoughts? Do you suspect malfunction, instability or EMI?
There are oscilloscopes in our school but I have to wait unil 2nd september for that.
I suspect it's some sort of interference on the powerline, it's probably not the battery itself because it does the same thing via the power supply.
It works fine when it's connected to the phone charger and even if it's next to all the other electronics there is no noise so probably not EMI or malfunction.
I also switched the power step down's boards and it is the exact same. It's strange that the amplifier itself is quet.
Check for continuity between the amplifier input ground and the BT board ground. Check from there to the battery negative terminal. Twist the wires coming from the battery. Bypass at the BT board power input.
With or without the BT board plugged in? I mean, when you said there was noise I assume it was heard through the amp.
Yeah the amplifier itself is mostly quet, if i go and put my ear directly next to the drivers, I can hear some hiss but it's really quet and not audible when you move just a few cm away.
The noise from the BT board output is a high frequency on power up and then constant buzzing
I'll go test the grounding rn.
Last edited:
Well, I just killed the board somehow so I guess I'll have to wait for further testing
I'm getting an isolated DC-DC because using a seperate supply doesn't give me any issues
- Status
- Not open for further replies.