[Q] buzz from 3.5mm jack when charging in car - HTC Rezound

Wondering if I am the only one who gets an audible buzz when I am in my car using the 3.5mm jack to feed audio to the car stereo, and am charging at the same time. The instant I unplug the charger, no more buzz. Seems that maybe HTC didn't properly isolate the circuits or something.

lukester01 said:
Wondering if I am the only one who gets an audible buzz when I am in my car using the 3.5mm jack to feed audio to the car stereo, and am charging at the same time. The instant I unplug the charger, no more buzz. Seems that maybe HTC didn't properly isolate the circuits or something.
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Click to collapse
Try a different charger. I had that same problem with bad charger.

Sounds like a ground loop. That happens when multiple devices are connected to the same power source and by other means. (Audio cable)
The easiest way to fix it is to unplug the charger. But if you must, try a different plug since usually car outlets are individually fused.

Related

3.5mm jack to aux + USB charger issue

I've got a USB charging cradle in my car which works fine.
I use a 3.5mm cable to connect my mp3 player to the car stereo which works fine.
I tried playing music from my HD to the stereo whilst charging and I get awful white noise and a constant pinging noise. If I take the phone off the charger it works fine. I can't find anything in the wiki or forums and I've seen some people on other forums with the same problem.
Anyone know what is wrong with this setup or I need a different spec cable (I guess its a standard stereo 3.5mm cable, so 3 contacts and I think the HTC one has 4 coz of the mic, but it works fine when I stop charging it. I guess it could also be a problem with the pins on the USB charger, but I thought the HD didn't have the extUSB connection.
I'm off to the USA on Sunday with a hire car so it would be really handy to be able to charge and play music!

[Q] Strange noise on MP3 playback in car

Hi all,
I tried searching for this issue but no success on paging through and search still seams to be down (for me).
I use my HD2 as an MP3 player when I'm out and about. The problem is, when I use it in the car (I have an AUX in on my car stereo so plug it directly in via the 3.5mm audio out jack) and have it plugged in to charge (especially when I have SatNav running as well) it makes an odd noise, its not loud and doesn't disrupt the music but it is clearly there and only does it when plugged into charge in the car (not noticed it via earphones when plugged in via PC or Mains).
I tried putting one of those Ferrite cable magnets on to try and stop any interferance but that has no effect.
Has anyone else had this? Does anyone know a way of fixing it as it does get annoying, especially on long trips I have to do for work?
Cheers
BigDave
The charger is causing the interference. Try another charger if you can...
I second that. Your car charger probably isn't shielded enough and you are getting electrical interference.
Try a motorola microusb car charger. maybe 10 bucks on amazon. That is what i am using and I don't get any interference.
xlr8me said:
The charger is causing the interference. Try another charger if you can...
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Click to collapse
I have this too, using my HTC branded cig lighter charger. It is alternator/ignition system noise coming though the cig lighter.
Just about any car audio shop should be able to install a noise filter on your cig lighter socket to eliminate most of the noise. You can also find these on ebay for about $20-30 and install yourself. They are easy to install. Generally they wire inline on the Pos wire and have a 3rd wire coming out of the filter that you tie to a grounded portion of the car body.
I had to install the above mentioned filters i picked up off ebay onto my stereo head unit and amp. There is still a nearly unnoticeable amount of noise. and I mean to hear it you have to turn the volume all the way up, have the car stopped, and no audio playing. Normal road noise or music content otherwise drowns it out. Now that i use my HD2 with the stereo I need to filter the cig lighter as well, I just haven't gotten around to it.
d0ug said:
I have this too, using my HTC branded cig lighter charger. It is alternator/ignition system noise coming though the cig lighter.
Just about any car audio shop should be able to install a noise filter on your cig lighter socket to eliminate most of the noise. You can also find these on ebay for about $20-30 and install yourself. They are easy to install. Generally they wire inline on the Pos wire and have a 3rd wire coming out of the filter that you tie to a grounded portion of the car body.
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Click to collapse
Cheers d0ug, just what I was looking for.
Thanks for the other replies too guys, i know it wasn't a specific charger issue as it did it with my HTC charger (before i broke it) and with my current outlet (a single unit with 2x 12v outlets and 2x USB sockets fed from a single 12v, only 1 usb in use at the moment).
Will try to pick one of those 12v noise filters up as soon as i can

Car USB Charging Whining Noise

Hi All,
Per the discussion of this thread: http://forum.xda-developers.com/showthread.php?t=1367120&highlight=usb+amazon+charger&page=3
I bought this Car USB Outlet Charger: http://www.amazon.com/gp/product/B002F0200Q/ref=oh_o02_s00_i00_details
It charges under AC mode, but if I also connect the 3.5mm jack to my cars speakers there is a high pitched noise that increases as the RPM of my engine increases (for example if I put my car in neutral the sound is at the lowest frequency, and if i step on it the sound shoots up).
If I remove the charger from the phone the noise stops. If I begin playing music the noise also goes away. If I stop any playing music then the high pitch noise will return after a brief (~5sec) period.
It's not a terrible issue because it doesn't interfere with playing audio, but it is an issue if nothing is playing and the car speaker is turned on.
Would appreciate any insight.
Thanks,
DL
I have the same issue. It's not the phone, it's your car. You are hearing the alternator noise through the electrical. I have some friends who are car audio installers and what you have is a most likely a bad ground on the auxiliary port. I've tried with 3 or 4 phones with my car and they all do it while charging.
From what I understand there's 2 ways to fix it. Have an audio Installer open it up and ground it properly. This takes time and could be complicated depending where the fault is.
There's also a magnetic shielding thing tthat you can pass your auxiliary cable through which is supposed to be like $5. I've not tried the simple fix yet. I keep forgetting to ask what iit is exactly.
Sent from my ADR6425LVW using Tapatalk
Well I was thinking it was an issue with the actual charger, not my car...
I've used a blackberry, and itouch before while charging and going to the car audio without the problem (but this was not with the Belkin adapter I linked to).
Just to be clear when you say an issue with grounding of the auxillary port you are referring to the the 3.5mm input, not the cigarette lighter port?
Let me try switching the cigarette port.
Yeah, the 3.5mm port. I've also tried changing chargers and nothing has made a difference.
so what you are saying is the issue is with my 3.5mm jack even though the noise doesnt come through if the charger is disconnected?
I've never had any problems with other devices when charging and playing audio.
Only with this particular usb charger and my rezound.
happens to me sometimes too...I just act like I'm in some kind of spaceship as I zoom down the highway
I'm thinking to buy something like this to power my devices, probably a good investment...
goo DOT gl/s0wO7 (can't post links yet, redirect to amazon for a powerline 200W power inverter)
Had the problem with a Verizon charger, took it back and the new one worked fine.
You could try some snap chokes (ferrite cores) they snap around the outside of the cables you may have seen them on some of your usb cables, they reduce interference
radio shack search "snap choke" they have two sizes that fit around the outside of the cable, 5mm and 3.5mm ... they come two to a package, try using them on the power wire and if that doesn't work try it on your aux output wire, they just snap on. you can snap them off if you want to remove them, you can use more than one on a cable if that helps
This is not a fix all and may or may not work but this is what they are designed for, it at least may cut down the noise some but no guarantee's
Once you search on radio shack, read the reviews on them you will see what some people are using them for, they are about $3.00 for 2 chokes
craigsdocks said:
You could try some snap chokes (ferrite cores) they snap around the outside of the cables you may have seen them on some of your usb cables, they reduce interference
radio shack search "snap choke" they have two sizes that fit around the outside of the cable, 5mm and 3.5mm ... they come two to a package, try using them on the power wire and if that doesn't work try it on your aux output wire, they just snap on. you can snap them off if you want to remove them, you can use more than one on a cable if that helps
This is not a fix all and may or may not work but this is what they are designed for, it at least may cut down the noise some but no guarantee's
Once you search on radio shack, read the reviews on them you will see what some people are using them for, they are about $3.00 for 2 chokes
Click to expand...
Click to collapse
Thank you for the suggestion. I will certainly take this idea into consideration.
I do think the piece is defective, but the amazon seller only offers a return, and it was only 5$, not sure if its worth the hassle.
The charging circuit on your alternator has a bad filter. The whine you're hearing is the AC generated...the frequency corresponds with your RPM. Basically, the rectifier diodes are doing what they are supposed to and putting that AC into the electrical system as pulsed DC, but there are capacitors and chokes that are supposed to smooth the current out so it doesn't stress out your equipment. It's possible the charger you got doesn't have a filter either. Ensuring your equipment has a good ground should help, but it may not fix the sound...you'd have to replace your alternator.
Its ground feedback. Could be anywhere in your car. Could also be the charger but probably not.
I have a similar effect, but fortunately it does go away once I start playing music. I only hear the noise when nothing is playing. I don't engine noise, just static. I know its related to the changing connect since it goes away when I unplug it.
I was thinking about seeing if there is something to impede interference that I can put inline with the cable or on it.
My aux audio was an PAC Audio connection that I installed, and the dock/charger I have is kind of cheap-o, so I figure its just the price of being frugal.
yes thanks all for the advice and feedback.
@ssb13 yes the sound interestingly stops right before any music plays, and then has a short delay before coming back after the music finishes.
I suspect a ground loop isolator would solve your problems.
Here's one from Kensington on Amazon:
http://tinyurl.com/6m58v6s
But there are several other makes that probably would work equally well. Just do a search on Amazon for a ground loop isolator.
Check out the comments on the Kensington one and see if the problems sound familiar.
I have the exact same problem! It happens with both the AC cigarette charger and the usb cable I have connected through my headunit. I have a cheap radioshack stereo cable as the connection between my rezound and the headunit, but when I've used headphones I don't seem to notice it either because the music is too loud to notice it or there isn't any interference. So I'm assuming the interference is caused by a feedback loop since power comes in from the charger and then audio goes out through the headphone jack and back into the car.
car charger noise
I purchased and installed an EMI/RFI suppressor from Mouser. It is a 2-piece ferrite cylinder that fits around the USB cable coming from the car charger/power supply. Unfortunately, it made absolutely NO DIFFERENCE in the noise. It is the same type of suppressor that is sometimes installed by the manufacturer on power supply output cables, so I was hopeful that it would work. Guess I will try looking for a loose ground connection.
[
A ferrite ("snap choke," "RFI suppressor") won't do a thing at audio frequencies. You're hearing whine from the alternator. It's worse because you have a ground loop - the phone is grounded by both the charger and the audio jacks. It's probably worse when no music is playing because the phone then turns off the output amplifier, making the output a high impedance and letting the noise be heard due to the ground loop. A ground isolator in the audio line will probably help, but may not completely eliminate, the noise. Why not get a Bluetooth audio adapter for your car?
Ground loops suck, at home they can be fixed by breaking off the grounding pin on a power strip and using that. But you can't do that in your car.

Does anyone have static when charging?

What the title says. Whenever I listen to music in ny car through the aux jack and charge my phone theres just a ridiculous amount of static. Whenever i disconnect the charger the static just disappears. Does this happen to anyone else? Anyone know a fix?
Sent from my PG86100 using XDA
all good here
but being a bit of an audio guy.. u may have a problem w/ your charger or your aux cable. audio signals get screwy when when they come close to a power source. so try other cables first before worrying too much.
this is the reason that when u install a car stereo, u run the power cable on one side of the car and the audio cables on the other.
shad0w77 said:
all good here
but being a bit of an audio guy.. u may have a problem w/ your charger or your aux cable. audio signals get screwy when when they come close to a power source. so try other cables first before worrying too much.
this is the reason that when u install a car stereo, u run the power cable on one side of the car and the audio cables on the other.
Click to expand...
Click to collapse
Thanks for the input. I'll try it out
Sent from my PG86100 using XDA
Get shielded rca cables.
#Root-Hack_Mod*Always\
a good quality power inverter (fanless) can eliminate the noise. i use Tripp-lite 150watt in my truck to eliminate the noise
http://www.newegg.com/Product/Product.aspx?Item=N82E16812120305

Possible Car dock sound issue out of 3.35mm

Hello everybody i recently got the sprint car dock and i was wondering if anyone else has seen this same kind of behavior as I have been seeing. Basically music played using the 3.35mm jack to an aux port on the car stereo just doesn't sound right. It seems like all the sound is going to my rear speakers while i play music from RDIO and my streamed music from Google play. It seems like the audio sounds much better while the phone is not docked. Has anyone else run into this issue? I remember that original Evo's dock did something where it automatically lowered the volume of the music being sent through the 3.35 jack.
When I had the photon and the dock, I had the same issue. Do you have a case on your phone?
If you do try to push down a bit harder with music playing, I bet you your other speakers will start working again.
The USB audio is picky on just how "properly" seated it is. I also noticed (again the photon) the audio is a bit quieter. Eventually I ended up using the mini jack connector and the usb for charging.
So after re-reading your post, I realized you are not talking about USB but the mini jack. What i have noticed however, I was using the 3.55mm today and the radio had to be turned up a bit more to get the normal listening levels I am currently used to (used to be 22-24, now its 30-35 for volume level on my radio) The sound did sound a bit.... off... but could not quite place it. I noticed the beats audio icon on the top when I had the music playing. It does not appear to be customizable except for an on and off?
anoying sound
As soon as I inserted my phone into the car dock with my 3.5 audio jack in it started making a buzzing sound. I double checked that the phone was seated properly and that the audio jacks were all the way secure. The sound disappeared as soon as I removed it from the dock. It is not very noticible if music is playing but if is not it is terrible. Am I the only one?
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
modplan said:
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
Click to expand...
Click to collapse
Id have to agree. I dont have the sound issue in my truck atm, using an aftermarket Pyle 7in dvd. But Ive had that same issue in other vehicles/devices (not with my LTE). Does the sound increase with the RPM at any range? If so they make a filter (I think its just a magnet idk) that can clear up that sound.
modplan said:
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
Click to expand...
Click to collapse
I do not have the issue at all when I disconnect from the dock. In fact, its minimal once I start to play something like Pandora. But as soon as I don't have something playing the buzzing kicks in and its annoying as hell. I have two 12v ports in my car and several different chargers and it does them for all of them. I think it may be something HTC knows about but hasn't confirmed yet...
modplan said:
This is likely a ground loop issue. I'm seeing it with my dock too. But i also see the exact same issue while charging WITHOUT the dock and always have with every phone in my truck. Unplug the charger, issue goes away.
Eventually I'm going to re-ground my cigarette outlet to a cleaner ground in my truck and see if that solves the issue.
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Click to collapse
This is pretty much spot on. I had to re ground one if my cigarette lighters that did this with my zune.
Sent from my EVO using Tapatalk 2
donatom3 said:
This is pretty much spot on. I had to re ground one if my cigarette lighters that did this with my zune.
Sent from my EVO using Tapatalk 2
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Click to collapse
I'm not saying that it wasn't the case for you, because it certainly is possible. However, correct me if I am wrong, you had the problem regardless of if the phone was in the car dock correct?
I ONLY have the problem when it is in the car dock. That makes me think it's not the 12v plug.
bds369 said:
I do not have the issue at all when I disconnect from the dock. In fact, its minimal once I start to play something like Pandora. But as soon as I don't have something playing the buzzing kicks in and its annoying as hell. I have two 12v ports in my car and several different chargers and it does them for all of them. I think it may be something HTC knows about but hasn't confirmed yet...
Click to expand...
Click to collapse
Can you try something? Take the same charger and try it with the phone in another car. One thats less then 10 years old if possible. (Not that its some magic age of the car, just better/properly grounded radios are more common, imo) Report back and let us know if the sound persists in that vehicle? Thanks
*Not saying yours, or anyone with the problems vehicle is 10+ years old - just wondering if it persists elsewhere.
bds369 said:
I'm not saying that it wasn't the case for you, because it certainly is possible. However, correct me if I am wrong, you had the problem regardless of if the phone was in the car dock correct?
I ONLY have the problem when it is in the car dock. That makes me think it's not the 12v plug.
Click to expand...
Click to collapse
I've had it on multiple devices that had their power adapter plugged into the car. There is also a chance it's your power adapter.
This is not an uncommon problem in car audio, it's so common that many manufacturers make devices to try to reduce the noise. http://www.radioshack.com/product/index.jsp?productId=2062214
Try adding a ground loop isolator into the audio cable. They can't be bought just about anywhere (Amazon, Radio Shack, etc.) for about $15 and should eliminate and ground loop noise. Ground loop noise is why it is so hard to find a car dock that includes audio out. Companies understand consumers want a car dock with 3.5mm audio out but wouldn't be able to design a dock that would eliminate noise in every case.
Filtering the audio line with a ground loop isolator is not a solution for me. They often dramatically reduce high tones and degrade audio quality overall. A real solution is to solve the issue on the electrical side, not the audio side.
OK, I think I understand what you are saying now. I get the normal ground loop whine that I have always gotten in my truck, that changes pitch with RPMs. Known issue with all phones in my truck, whatever.
But today I also noticed a Static (1 second) Static (1 second) Static (1 second) Static (1 second) that was only noticable when my phone was in the dock, plugged in, no music playing (in between songs) AND the beats audio logo was visible (beats was off, I do not use it). Beats logo goes away (when there is more than a second or two of silence) and the static stops. I'm not sure if the static is stopping then because the beats signal processor is turning off, or because the phone is turning off power to the headphone jack. If it is the beats processor turning off, I could try to make a mod to always keep it off (I don't use it anyway).
Is anyone seeing this static (static, not whine) while plugged in but NOT in the dock?
Is this what the OP is seeing? How about the rest of you?
modplan said:
OK, I think I understand what you are saying now. I get the normal ground loop whine that I have always gotten in my truck, that changes pitch with RPMs. Known issue with all phones in my truck, whatever.
But today I also noticed a Static (1 second) Static (1 second) Static (1 second) Static (1 second) that was only noticable when my phone was in the dock, plugged in, no music playing (in between songs) AND the beats audio logo was visible (beats was off, I do not use it). Beats logo goes away (when there is more than a second or two of silence) and the static stops. I'm not sure if the static is stopping then because the beats signal processor is turning off, or because the phone is turning off power to the headphone jack. If it is the beats processor turning off, I could try to make a mod to always keep it off (I don't use it anyway).
Is anyone seeing this static (static, not whine) while plugged in but NOT in the dock?
Is this what the OP is seeing? How about the rest of you?
Click to expand...
Click to collapse
I am not the OP but I am getting the exact same results that you are. It sounds perfect when not in the dock. When in the dock it makes a terrible buzzing noise until I start to play something. I have tried multiple chargers including OEM HTC ones in multiple vehicles and the problem still persists. How can ground loop be non existent when I'm charging my phone with just the cable (outside of the dock)? It has to be something else. I ordered the HTC Stereoclip yesterday and should have it be the end of this week to test wireless play.
willyam111 said:
Try adding a ground loop isolator into the audio cable.
Click to expand...
Click to collapse
I already had one installed for my Epic, and still get the noise on my EVO....
Just out of interest, is the 3.5mm jack going into the Phone, or is it tied into the charger cable. I currently have a MOTO Atrix and the Car Dock USB Cable splits off with an Aux Jack connection. That way you don't need to keep plugging the Aux Cable into the phone everytime you dock. I've never had any interference with this approach.
I'm getting the EVOLTE as soon as possible, so I'm interested in this answer. Plus, how it's being connected may be part of the problem?
csyrell said:
Just out of interest, is the 3.5mm jack going into the Phone, or is it tied into the charger cable. I currently have a MOTO Atrix and the Car Dock USB Cable splits off with an Aux Jack connection. That way you don't need to keep plugging the Aux Cable into the phone everytime you dock. I've never had any interference with this approach.
I'm getting the EVOLTE as soon as possible, so I'm interested in this answer. Plus, how it's being connected may be part of the problem?
Click to expand...
Click to collapse
There is no audio jack coming out of the dock. You still have to use the one on the phone itself.
So I took apart the dock and there is one small chip inside. Seems like a lot for what should just be usb passthrough. I tried removing the blue led hoping that that was the cause of the interference but it did not help.
There are lots of resistors and capacitors on this board. Does anyone know of we remove them all it will be straight usb passthrough? I get MUCH less interference in my truck with just charging and NOT the dock using the same cable. I good way to test this is to turn the Media volume all the way down on your phone and up high in ur vehicle and you will get tons of static and popping.
Any electrical engineers in the crowd? I if not I guess I have to buy a stereo clip :-(
Sent from my EVO using XDA
Those electronics are probably what activate Car Mode.
ahecht said:
Those electronics are probably what activate Car Mode.
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Click to collapse
Activating car mode is done my simply shorting pins 4 and 5 on the USB connector, no electronics required and is why the dock will still put your phone into car mode when not even plugged in.

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