Intermittent audio buzz when recording with power adapter

While running my 13" Unibody MacBook Pro on the power adapter, I get an regularly pulsing buzz that affects audio recorded in through my Griffin iMic. There's a sample of the buzzing I recorded at http://drp.ly/lmd8R - it starts halfway through it. The buzzing starts a few seconds after plugging in the power adapter and stops a few seconds after plugging it in. The power adapter is grounded and the cord is separated from the audio cords. Any help would be appreciated.

Are the Mac and all of the connected devices plugged into the same grounded UPS or outlet strip?
When I had a similar problem I ended up having a very serious electrical wiring problem in my house–a poor earth-neutral bond in my case. You may want to have a professional electrician check things out.
Message was edited by: DaddyPaycheck

Similar Messages

  • Noise on audio output when using the power adapter

    I'm a musician and use my mid-2007 MBP 15" in my live rig. When I use the power adapter, I hear a buzz, sometimes accompanied by a slightly louder buzz that cycles on & off about 1x/second. There are a few weird things going on here:
    1. The buzz does not happen all the time. That leads me to think it may be noise in the AC line that the adapter is plugged into.
    2. The noise is heard when I use both the built-in audio output AND an external USB audio interface.
    In any case, when I disconnect the power adapter and run my MBP on battery, the noise goes away completely. I can probably do this on most gigs, but I'm a little nervous since I run a FW drive, an external USB audio interface, and my midi keyboard (powered by USB) so I am putting a little heavier than usual load on the MBP's battery.
    As I said, this may be a noisy AC line. Another guess is that it's the PMU inducing noise into the audio circuitry. I'm hoping a simple AC line filter can help me but I thought I would ask here first in case anyone else has dealt with this. TIA for any help!

    I had a similar problem and fixed it with a $5 universal travel adapter. Yours might be different but here's my situation. Try it for little cost and see if it works.
    I'm also a muso with an iMac running external KRK speakers via USB Mbox2. Previously I had a Macbook Pro and the same audio problem. I've been putting up with a very low volume, high pitch noise until now. I simply plugged the Mac power cord into a universal travel adapter which then goes into the wall. For Aussie users there is an adapter on ebay that will allow a 3 pin Aussie plug to go into female side and has a two pin Aussie male on the other. For US users you can probably get the same although there is a 59c product that will do the trick called a ground lift adapter. Applecare actually agreed this was the best fix and confirmed there would be no problems with power supply or Mac performance. What a gem ! God knows I've looked into all kinds of alternatives that could have cost hundreds instead of $5.

  • No audio preview when recording with line-in

    I am using my keyboard to record music- and it works ok- the only problem is, when i hit the keyboard it makes no sound in garageband. however, when i hit record and play my keyboard (still no sound) but it does record. then i can hit replay it and it sounds perfect.
    is there a way that i can hear what i'm playing while i'm playing it? I'm using garageband 3.04
    it is way too difficult not being able to hear what i'm playing. and i hate having to re-do and review a million times to get it perfect.

    http://www.bulletsandbones.com/GB/GBFAQ.html#monitoron
    (Let the page FULLY load. The link to your answer is at the top of your screen)

  • My MBP Retina 15" shutdown when I plug it with Power adapter.

    My MBP Retina 15" will auto-shutdown when I plug it with Power adapter.

    Hi ...
    Try here >  Apple Portables: Troubleshooting MagSafe adapters

  • Importing to iMovie: How do I use an external usb mic when recording with the built-in FaceTime HD Camera?

    Hello all
    I'm scheduled to work with a friend this week; I'm going to help him make a simple audition DVD.  I promised him I had the necessary equipment and such.
    I was importing from the webcam using iMovie.  If I can't use my external mic to record for the video, there is more involved in the editing process.   I was hoping to record the video and audio into one package.  I'm using the built-in FaceTime webcam on my macbook pro and a ZoomH1 on usb.
    I've tried changing the audio in system preferences: input to H1.  This works when recording with audacity or anything else.  I even changed the input on FaceTime to H1.  There aren't any preferences I can find in iMovie to change the input for importing video directly from the webcam.
    How do I change the audio input for direct import on iMovie?   
    OR
    Is there something else I can do to have HD video and HQ audio captured in one video file on my macbook pro?
    I suppose I can record the video and audio separately but that is usually much more involved.  This is why I got this usb microphone lol.
    Thanks in advance,
    -Seth

    I just found using QuickTime Player to record a movie works great.  I can easily change the audio input.  iMovie is silly. lol
    If I missed anything let me know.
    Thanks
    -Seth

  • When using my power adapter, the light is green for a two seconds and turns red.

    When using the power adapter for my MacBook 2.1, the little light on the connector is green for 2 or 3 seconds and then turns red.  I bought a new adapter, but it is the same thing. It looks like the computer is charging.  What's wrong with it.

    Nothing wrong. Here is what Macbook manual has to say:
    When you first connect the power adapter to your computer, an indicator light on the
    power adapter plug starts to glow. An amber light indicates that power is going to the
    battery. A green light indicates that no power is going to the battery, which can mean
    the battery is fully charged, is not installed, or has a problem. If you don’t see a light,
    your plug probably isn’t seated correctly. Check for any debris and remove it. You can
    monitor the battery level using the Battery status menu in the menu bar or by
    checking the battery level indicator lights on the bottom of the battery (see page 74).

  • Any way to boost audio input when recording?

    Hi; I have been recording speech interviews with Audio-Technica mics on a ProTools set-up and they've sounded great.
    I've recently tried recording using the mics in Garageband using a M-Audio Mobile Pre USB, but the audio levels are always too low unless the subject is an inch or two from the mic, which isn't the best way to get quality audio.
    Is there any way to boost the audio input when recording in GB or any other tricks people know of?
    thx, Charlie

    I'm actually having the same problem, except I'm recording straight into the computer (no interface).
    I tried using an MBox, but the computer won't even recognize it...(if anyone's got suggestions for why that is, I'll gladly take them...).
    My main question is the same as Charles's, however - how come the input level is so soft when recording using the "Built-In Input" (where I can use a mic, and have mobility) as opposed to the "Built-In Microphone"?

  • No Audio on Videos Recorded with OS 2

    Hello After a few days with the version 2 I just realized that when I transfer the videos  I recorded with my PB to my MAC, the videos dosen´t have audio.
     All the videos recorded with the OLD PB version does have audio.
    I have PB 2.0.0.7971 and Mac OSX 10.7.3
    Thank you.
    PS. All videos work great on PB.

    No, I imported by two different ways:
    1.- Direct from PB as USB.
    2.- Importing media from BlackBerry Desktop Software.
    In both cases same result no audio in videos recorded with PB 2.0

  • If I purchase an iphone 6 does it come with power adapter, cable

    If I purchase an iphone 6 does it come with power adapter, cable?  It kinda indicates yes but then suggests you buy them when you go to check out ?

    Yes, if you buy from Apple. Scroll down this page:
    http://store.apple.com/us/buy-iphone/iphone6
    to the "What's in the box" section.
    High-demand Apple items like iPhones are attractive to unscrupulous resellers because people want them so badly they will take stupid actions to get one. Bad resellers may quote a price tha sounds great but then say it does NOT include the accessories that Apple ships at no cost.
    Go with Apple if you are new to this.

  • Isight audio does not record with video

    isight audio does not record with video

    Welcome to the forum.
    Can you provide us with a bit more information, please?
    What OS version are you using?
    What are the full specs. of the AV file, that is not Importing with Audio?
    What Project did you set up, at New Project?
    Exactly what steps were used to Import that AV file?
    Did you allow adequate time for PrE 12 to Conform the Audio portion of your file?
    Good luck,
    Hunt

  • HT2037 icon reads "battery not charging" with power adapter lit "green". Do I replace battery or power adapter?

    icon reads "battery not charging" with power adapter lit "green". do I replace the battery or the power adapter?

    Go to the Apple in the upper left corner and select About This Mac, then click on More Info, then select Power from the left hand column of the System Profiler. Copy and paste the Battery Information back here.

  • No Audio when recording with built -in mic

    i have used imovie HD for a while no and when i record with my macbook, it makes perfect video with sound. i have just done my first recording with imovie '08 and there is no sound at all. my setting are set to internal mic. is there something special i have to do to make it record both sound and audio?
    please help. i have recorded about an hour of work for future keynote presentations and would be destroyed if i had to remember everything i came up with.

    how do you do it?
    1. Create a New Basic Track
    2. Click the record button
    3. There is no step 3.

  • Is it normal with higher temperature when plug in with power adapter?

    Hey guys, I am wondering if is normal that the computer is much more hotter when running with the power plug in, because the temperature is much more lower when running with battery.

    I have the same issue exactly, i downloaded istat pro widget as it monitors the temperature and it tell you what is the temperature but now i am trying to find what is the normal temperate for mac book pro is i know when it is getting hot

  • Lots of audio pops when recording from mixer

    I'm using FCP 5.1.4 on a mac laptop (don't know what type it is, but think it's somewhat recent). I'm recording a stage play's audio.
    Here's my audio flow:
    Mixer's 1/4" headphone jack -> 1/4" Stereo audio cable -> 1/8" stereo adapter at other end (have also tried 1/8" mono) -> Laptop's microphone port (no other input audio port available)
    I can get a good signal, but there's constant audio pops/clicks happening at a steady rate. I remember reading somewhere else that problems can arise when recording directly from a mixer due to the high signal strength coming from it. Any ideas why this is happening? How do I fix this?

    Phillip Roh wrote:
    What is a mic bus level output?
    Most better mixers have direct bus ins and outs. Just like plugging in a mic.
    Laptop doesn't have a line in port
    Get a different computer if you're expecting to enjoy doing audio capture.
    If i used the RCA or XLR output jacks, would the popping still occur?
    Irrelevant, it's all about signal type, resistance, milliamperes, millivolts and milliwatts. Not connectors. You can put an XLR on your power supply and it wouldn't change the voltage.
    I think my workplace may have a few USB audio things lying around. Like it has 2 XLR input ports, then connects to computer through USB. Do you know if they tend to need certain software, or if they're plug and play?< </div>
    Unknown from here. this is not a FCP question.
    bogiesan

  • 2nd Gen Shuffles charge with power adapter, not seen at all by computer

    I have three Gen 2 Shuffles (mine and kids), and am having same problem with all three.
    If I plug them into either of our home computers - an iMac and a brand  new Macbook Pro - they don't even seem to be recognized at all by the computer as even being plugged in, nor will they charge. The orange light flashes on for a split second when I plug in the USB cord, then goes out.  Nothing else happens.  I have two USB cords - same with both.
    If I plug the same USB cords into the power adapter and plug into the wall outlet - all three iPods charge, with either cord.  So the cords seem to be working fine.
    If I plug the USB cord into my work PC - a Dell that doesnt' even have iTunes on it -- the computer recognizes the iPod as a disk.  I've done this many times for many years to charge it at work if it was low, with no problems.  And I haven't plugged the kids' into my work computer.
    I am pulling my hair out here. I've read about others with a similar problem -- but in those cases at least the iPod seemed to be communicating with the mac, but not showing up in iTunes.  In my case, I can't even get anything to happen!!
    Would really appreciate any advice.
    Intel Core 2 Duo iMac with 10.5.8, and Macbook Pro bought last week with OS-X Lion.

    Nobody has any ideas?

Maybe you are looking for