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304 posts

Ultimate Geek


# 253158 29-Jul-2019 23:11
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I have a 2007 Mazda Axela, with the original factory stereo. It has an AUX cord fitted and if I plug this into my phone (or other device, eg other phones, raspberry pi) at the same time as charging through a USB/Cigarette lighter plug I get buzzing, crackling through the speakers. 

 

  • Same problem with engine running or not. 
  • Tried powering the USB 12v power adapter directly from the battery (eg using power lead running in the window) 
  • Tried using a different USB 12v power adapter.
  • Earthing the radio unit directly to the battery makes no difference (cable in the window again)
  • Tried removing the band expander, no difference. 

It doesn't happen if I:

 

  • Do not charge the phone or device. 
  • Charge or power the device from a USB power brick (that itself is not charging from car). 
  • Charge or power the device from the same USB 12v power adapter that causes issues, if I power that from a spare 12v battery disconnected from the car. 

I haven't yet tried running an inverter from the car 12v battery then using the inverter to power a wall phone charger to drop the 230vac down to 12vdc. 

 

Don't have an audio input device eg bluetooth to AUX that I can run directly off 12v. 

 

Any other suggestions? Is there another 12 > 5v USB adapter that would give cleaner power? 


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'That VDSL Cat'
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  # 2285434 29-Jul-2019 23:34
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It's noise from the USB charging, has todo with the ground differential. Not uncommon in cars, Unfortunately quite common with Mazdas in my experience.

 

 

 

https://www.aliexpress.com/item/32595509079.html?spm=a2g0s.9042311.0.0.27424c4dovtrsF

 

One of these will get rid of the most of it (If i peak out, i can pickup it sometimes. but rare). Alternatively charging at 5V 0.5A also





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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.




304 posts

Ultimate Geek


  # 2285435 29-Jul-2019 23:36
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Thanks. If I got a bluetooth/aux unit that was permanently fitted, and ran on 12v, that would probably solve the issue? Then my phone can wirelessly send audio through BT, and charge independently. 


 
 
 
 


'That VDSL Cat'
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  # 2285437 29-Jul-2019 23:43
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An option I've considered but not gotten around to actually trying..

It was on my to do list before grabbing one of those things. I bought one thinking what rubbish.

It's tied me over plenty well!


Now USB c to 3.5 + charging split cables.. Those are trash from China...




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Stu

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  # 2285456 30-Jul-2019 07:44
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You'll possibly find you'll still need a ground loop isolator with a Bluetooth unit that is powered by the car's 12V system, as it's an issue with the car stereo tied up with the ground (-ve) connection passing through AUX input, and not your phone. I've been running a ground loop isolator with a cheap, but effective, old A2DP Bluetooth adaptor I got from the old Dick Smith, when it still was Dick Smith! Have been meaning to update it, but it still works so haven't bothered.




Keep calm, and carry on posting.

 

 

 

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