How to remove buzzing/noise from a cheap Bluetooth Music Receiver? (Experiment)
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Date: 2020-09-05
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Comments and reviews: 9
Theo
I had the same EXACT problem a month ago. After deciding this would not work and almost abandoning the project I read a hidden note on the datasheet in broken english translated from chinese: SOLDER MUST CABLE ON GROUND AMPLIFIER, cable should be not long! The Chinese got that right! I glued the bluetooth board directly next to the PAM8610 amplifier and soldered the ground with thick wire 10mm long in total. NO NOISE anymore.
Take away message: Solder with very short & thick wire the GND of the Bluetooth to the power GDN of the amplifier.
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I had the same EXACT problem a month ago. After deciding this would not work and almost abandoning the project I read a hidden note on the datasheet in broken english translated from chinese: SOLDER MUST CABLE ON GROUND AMPLIFIER, cable should be not long! The Chinese got that right! I glued the bluetooth board directly next to the PAM8610 amplifier and soldered the ground with thick wire 10mm long in total. NO NOISE anymore.
Take away message: Solder with very short & thick wire the GND of the Bluetooth to the power GDN of the amplifier.
reply
Leon
I have a similar problem: I've got an old/vintage Transistor Radio which I want to use with a wall adaptor. It takes 9V. I tried many different power supplies but I always get varying forms of high pitched noise through the speaker on every volume level. When I use it with batteries that doesn't happen. So the problem is definitely the power supply. Does a device like you used in the video help in such a scenario? Or how else would I eliminate the noises?
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I have a similar problem: I've got an old/vintage Transistor Radio which I want to use with a wall adaptor. It takes 9V. I tried many different power supplies but I always get varying forms of high pitched noise through the speaker on every volume level. When I use it with batteries that doesn't happen. So the problem is definitely the power supply. Does a device like you used in the video help in such a scenario? Or how else would I eliminate the noises?
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Siana
You know what i find most interesting in this video? Your amplifier. It uses an unbiased output stage where you're simply forcing the opamp to slew right over the required approx 1V bias voltage gap of the output transistors, and to somewhat smooth out the resulting switching atrocity, you have a feed forward resistor. This is actually kinda cool. According to my simulation, not quite hi-fi, but cool.
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You know what i find most interesting in this video? Your amplifier. It uses an unbiased output stage where you're simply forcing the opamp to slew right over the required approx 1V bias voltage gap of the output transistors, and to somewhat smooth out the resulting switching atrocity, you have a feed forward resistor. This is actually kinda cool. According to my simulation, not quite hi-fi, but cool.
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Jedzia
Your 12V supply including the ground impedance is so bad that a coupling from the downstream 5V regulated parts current consumption occurs?
And why is there no decade capacitor at the 7805? They tend to swing like Louis Armstrong.
So the solution is to put another black box that is essentially a chopping-device in the power path of an audio application? Great, Scott! ;)
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Your 12V supply including the ground impedance is so bad that a coupling from the downstream 5V regulated parts current consumption occurs?
And why is there no decade capacitor at the 7805? They tend to swing like Louis Armstrong.
So the solution is to put another black box that is essentially a chopping-device in the power path of an audio application? Great, Scott! ;)
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ProfessorOzone
Hmmm. I only have 5 volts supplying both the amp and the bluetooth receiver, but my amp is mono and doesn't have a separate ground for power and audio. The bluetooth receiver does. Any suggestions to stop the noise, which is present only when my phone connects to the bluetooth receiver?
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Hmmm. I only have 5 volts supplying both the amp and the bluetooth receiver, but my amp is mono and doesn't have a separate ground for power and audio. The bluetooth receiver does. Any suggestions to stop the noise, which is present only when my phone connects to the bluetooth receiver?
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Karaca
I tried your third solution(B0505S) and the buzzing sound diminished but the buzzing sound is still there. The strange thing is that when there is some sound comming from the bluetooth speaker it works perfectly but when there is no sound after 2/3 seconds it starts again to buzz?
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I tried your third solution(B0505S) and the buzzing sound diminished but the buzzing sound is still there. The strange thing is that when there is some sound comming from the bluetooth speaker it works perfectly but when there is no sound after 2/3 seconds it starts again to buzz?
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Vendelator
Lets say i have a Adafruit Powerboost 1000C Powering a Pam8406, which works great, but i would prefer a bluetooth connection instead. How should i connect these devices to avoid this interference? Do i need a certain chip since they will share the same lipo battery as source.
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Lets say i have a Adafruit Powerboost 1000C Powering a Pam8406, which works great, but i would prefer a bluetooth connection instead. How should i connect these devices to avoid this interference? Do i need a certain chip since they will share the same lipo battery as source.
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Bhawna
I have a music system and i have attached a rca to 3. 5mm jack.
Whenever i touch the jack i hear a buzzing sound or even when i insert that in any device a humming sound can be heard. How can i fix this. please help
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I have a music system and i have attached a rca to 3. 5mm jack.
Whenever i touch the jack i hear a buzzing sound or even when i insert that in any device a humming sound can be heard. How can i fix this. please help
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David
Just use two diodes connected in parallel. One must let the voltage through in one direction and the other in the other direction. Because of the voltage threshold that has to be passed, the buzz voltage cannot pass.
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Just use two diodes connected in parallel. One must let the voltage through in one direction and the other in the other direction. Because of the voltage threshold that has to be passed, the buzz voltage cannot pass.
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