Audio feedback while charging

[omniphil]

When I am playing audio though the headphone jack and charging the phone at the same time I hear some background noise. Just wondering if you guys have it too or if maybe my cables are junk.

I have the media volume at 100% and use the car stereo to adjust volume. phone is cabled to the aux jack in my factory radio. Once I unplug the charging cable the noise goes away. (I am using my old motorola branded car charger from my droid 1)

Might be noise in my electrical system too...
I notice it mostly with talk show podcasts as they are less noisy than music.

Are you guys running into this too? Hopefully its something in my vehicle and not the phone itself.

 

[thedeceiver]

When I am playing audio though the headphone jack and charging the phone at the same time I hear some background noise. Just wondering if you guys have it too or if maybe my cables are junk.

I have the media volume at 100% and use the car stereo to adjust volume. phone is cabled to the aux jack in my factory radio. Once I unplug the charging cable the noise goes away. (I am using my old motorola branded car charger from my droid 1)

Might be noise in my electrical system too...
I notice it mostly with talk show podcasts as they are less noisy than music.

Are you guys running into this too? Hopefully its something in my vehicle and not the phone itself.

I also have this issue. I had it with my Thunderbolt as well, however, it was FAR FAR less pronounced. It seems like there is some cross talk INSIDE the phone when there is an electrical current flowing through it.

I'm using a PoS cheap car charger.

Have you tried plugging the phone into the AC adapter/charger in your wall at home and putting in some headphones to see if you notice the same issue? I haven't tried yet but will.

 

[omniphil]

I also have this issue. I had it with my Thunderbolt as well, however, it was FAR FAR less pronounced. It seems like there is some cross talk INSIDE the phone when there is an electrical current flowing through it.

I'm using a PoS cheap car charger.

Have you tried plugging the phone into the AC adapter/charger in your wall at home and putting in some headphones to see if you notice the same issue? I haven't tried yet but will.

That's a good idea. I will try at home with some headphones and see. I think the issue there is that with headphones the media volume wont be very high so maybe you wont here it.

 

[iii9ix3]

When I am playing audio though the headphone jack and charging the phone at the same time I hear some background noise. Just wondering if you guys have it too or if maybe my cables are junk.

I have the media volume at 100% and use the car stereo to adjust volume. phone is cabled to the aux jack in my factory radio. Once I unplug the charging cable the noise goes away. (I am using my old motorola branded car charger from my droid 1)

Might be noise in my electrical system too...
I notice it mostly with talk show podcasts as they are less noisy than music.

Are you guys running into this too? Hopefully its something in my vehicle and not the phone itself.

What you are hearing is a 60hz tone caused by a ground loop. Just add a $20 ground loop isolator and you should be good to go.

Ground loop (electricity) - Wikipedia, the free encyclopedia

 

[omniphil]

What you are hearing is a 60hz tone caused by a ground loop. Just add a $20 ground loop isolator and you should be good to go.

Ground loop (electricity) - Wikipedia, the free encyclopedia

Its not a constant tone, its changes in pitch and frequency. Is a ground loop isolator one of those ferite chokes that you can snap on the power cable?

 

[DBVille]

Get the best charger money can buy - probably a VZW, anyways, and see if it doesn't improve. It normally is caused by changes in voltage on the charging circuit. A really good charger will minimize this, a cheap one makes it really bad. Ground loops can also cause it, and may or may not show a variation in noise.

 

[omniphil]

Get the best charger money can buy - probably a VZW, anyways, and see if it doesn't improve. It normally is caused by changes in voltage on the charging circuit. A really good charger will minimize this, a cheap one makes it really bad. Ground loops can also cause it, and may or may not show a variation in noise.

https://forums.androidcentral.com/e...ource=vb_ac&utm_medium=content&token=SLywBDFk

This is the one I have, supposedly it had a chip in it that communicated with the battery in my droid. Not sure if I believe that, but it did charge the droid from dead to full in just over an hour. Seems like a pretty quality charger. But I will certainly try some other chargers too. I will try the the standard nexus wall charger in my car as its got an inverter built in.

 

[thedeceiver]

Some of this is definitely on the phone. I am using the same charger, same car, same audio in cable, same stereo, and while I heard it a small amount on the Thunderbolt, it is VERY loud on the Nexus.

Also, the pitch of the noise, etc. seems to change based on what the engine is doing. THe pitch definitely changes as I accelerate and decelerate. It's kind of weird/neat.

I listen to my music pretty loud and I actually had to unplug my charger because it was so distracting.

 

[omniphil]

Some of this is definitely on the phone. I am using the same charger, same car, same audio in cable, same stereo, and while I heard it a small amount on the Thunderbolt, it is VERY loud on the Nexus.

Also, the pitch of the noise, etc. seems to change based on what the engine is doing. THe pitch definitely changes as I accelerate and decelerate. It's kind of weird/neat.

I listen to my music pretty loud and I actually had to unplug my charger because it was so distracting.

Same here, I went from the Droid 1 to the Nexus. the Droid 1 made the faintest noise at 100% volume, and if I turned down the volume 1 notch the noise was not noticeable at all. And I think that was just some sort of feedback with the volume at max.

The droid 1 also had some of the best/cleanest audio hardware out there from what i've tried. The Nexus, not so much

 

[iii9ix3]

Some of this is definitely on the phone. I am using the same charger, same car, same audio in cable, same stereo, and while I heard it a small amount on the Thunderbolt, it is VERY loud on the Nexus.

Also, the pitch of the noise, etc. seems to change based on what the engine is doing. THe pitch definitely changes as I accelerate and decelerate. It's kind of weird/neat.

I listen to my music pretty loud and I actually had to unplug my charger because it was so distracting.

definitely a ground loop issue if you are hearing pitch change with acceleration. alternator ripple varies based on engine RPMs. the noise is not the fault of the phone, difference in the volume of the noise can be explained by differences in power circuitry. Any device in this setup will have this noise, unless a ground loop isolator is built in.

 

[thedeceiver]

definitely a ground loop issue if you are hearing pitch change with acceleration. alternator ripple varies based on engine RPMs. the noise is not the fault of the phone, difference in the volume of the noise can be explained by differences in power circuitry. Any device in this setup will have this noise, unless a ground loop isolator is built in.

I'm not disagreeing on root cause... nor the fact that any device will have that issue... what I'm struggling with is why it is significantly worse than on the TBolt.

 

[iii9ix3]

I'm not disagreeing on root cause... nor the fact that any device will have that issue... what I'm struggling with is why it is significantly worse than on the TBolt.

difference in power supply circuitry. power circuits are not my specialty, but i'd guess that tbolt power supply has more tolerance to ripple due to the fact that there is more room on the PCB for components. samsung probably sacrificed a but of robustness for a smaller PCB footprint.

 

[omniphil]

Well last night I tried charging the phone off of 2 different wall adapters through the ac inverted in my jeep. I tried the oem unit that comes with the phone and also a motorola unit. Neither one had any noticeable feedback in the audio. The ac inverter must cancel that out as it goes from DC to AC to DC..

I'll have to try some other car chargers, and maybe try getting the power from the fuse box instead of the cigarette plug.