There is buzzing noise..Did i do anythng wrong with this set up? - diyAudio
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Old 6th November 2014, 11:38 PM   #1
ng501 is offline ng501  United States
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Default There is buzzing noise..Did i do anythng wrong with this set up?

Click the image to open in full size.

I am modifying this headset to bluetooth,

so i connect the battery to both bluetooth module and to the headset power ( i believe is for noise cancellation and amp),

switch the audio input from the jack to bt module,

ground both headset amp and audio input together and connect to battery neg-... and when i connect my phone to bluetooth there is buzzing sound coming out! it is fine when i use 3.5mm jack as audio source....

someone tell me put 0.1uf capicitor on both right and left channel between the bluetooth and the headphone driver can filter that sound....is that true or should i use a resistor instead?


Please help! Thanks!
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Old 7th November 2014, 07:19 AM   #2
ng501 is offline ng501  United States
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any suggestion?
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Old 7th November 2014, 08:19 AM   #3
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Any suggestion? Okay, here goes with that:
ONE ground wire, only one; because, there is only one ground.
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Old 7th November 2014, 09:01 AM   #4
ng501 is offline ng501  United States
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Click the image to open in full size.

here is the orginal 6 cable

1)blue for the power positive
2)black for power nag-
3) copper for power ground
4) red audio right
5) green audio lefr
6) audio ground.


do you mean that two ground is a common ground?
so what is the best way to connect these to one battery and a bluetooth module with out the annoying buzzing noise??

Thankss
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Old 7th November 2014, 10:36 AM   #5
AndrewT is offline AndrewT  Scotland
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Measure the resistance from one ground wire to the other ground wire.
It could be zero ohms, or it could appear open circuit.
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Old 7th November 2014, 04:30 PM   #6
ng501 is offline ng501  United States
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so where is the noise come from? im newbie,,,,,
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Old 7th November 2014, 05:50 PM   #7
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Is the battery more than 5v?
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Old 7th November 2014, 06:39 PM   #8
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Can you tell us more about the headphones. Model, functions, voltage and how are they normally powered?

I think the blue device is a TP4056 1A Li-Ion battery Charging Module. Not bluetooth.

Did you measure any the voltages and are they correct for the headphones?
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Old 7th November 2014, 10:18 PM   #9
ng501 is offline ng501  United States
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the battery is 3.7v, headphone is a beats studio v2.

the pic i upload is the original set up with the battery and 4056 charging module and 3.5mm jack. it works well with no noise.

However, after i add the module from here
http://www.amazon.com/gp/aw/d/B00AND...&robot_redir=1

it will get a buzzing sound. Again, this module running when i only use the 3.7v battery above and connet it to other speaker.

the problem comes when connect the headphone power, battery, bt module and audio in all together.

some people suggest it is a ground loop problem becoz i use the same power souce for both the bt module and the headphone amp.

thanks for.you guys help!
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Old 7th November 2014, 10:20 PM   #10
ng501 is offline ng501  United States
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yes the battery voltage is fine and i have no problem when i only run it on the 3.5mm jack...just has problem when its connect to the bt module.,.
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