Page 1 of 3 123 LastLast
Results 1 to 10 of 21

Thread: massive noise when i plug my laptop in

  1. #1
    Constant Bitrate
    Join Date
    Apr 2004
    Posts
    167

    massive noise when i plug my laptop in

    my system is nice and quiet when my laptop is running on batteries, as soon as i plug the AC adapter into the lighter though, everything goes nuts. it sounds like a helicopter is in my car and the video has lines running through it pulsing to the sound. probably some sort of grounding issue but is there an easy way to troubleshoot/solve?

  2. #2
    Maximum Bitrate falconey's Avatar
    Join Date
    Feb 2004
    Location
    Atlanta
    Posts
    836
    Maybe you could try another lighter adapter. Also are you sure that the lighter is producing enough power to run the laptop?

  3. #3
    Jesus Freak antimatter's Avatar
    Join Date
    Jan 2004
    Location
    California
    Posts
    4,545
    Laptop sound cards ae natorious for horrible integrated sound cards.

    What kind of noise is it? Alternator whine? Static? I am researching the cause of the alternator whine in my system.

    Please post more info
    -Jesus- King of Kings Lord of Lords

  4. #4
    MySQL Error Scouse Monkey's Avatar
    Join Date
    Mar 2004
    Location
    Bristol
    Posts
    9,727
    I sometimes get a lot of noise on my laptop due to a bad earth I think but then i do have a solid magnesium case. Try running an extension lead out yo your car and run your laptop with the AC adapter running on mains but still have it playing through your car and see if that helps. Also, check the headphone connection on your laptop.

  5. #5
    Constant Bitrate
    Join Date
    Apr 2004
    Posts
    167
    ill check all this stuff, but again when its on battery, no problems, quiet as a mouse, so its not a sound card issue. im going to guess on AC power it wont be a problem. its not alternator whine, i cant quite describe it other than a helicopter . ive routed the DC power wire away from all other wires and it quiets it down a little but it's still bad. at some point i'll try to wire it direct to the battery which is how everything else is wired and see how we fare.

  6. #6
    Jesus Freak antimatter's Avatar
    Join Date
    Jan 2004
    Location
    California
    Posts
    4,545
    Quote Originally Posted by robr
    ill check all this stuff, but again when its on battery, no problems, quiet as a mouse, so its not a sound card issue.
    Not necessarily true. the problem is only apparent when the car is on and there is tons of noise surging through the system. Your sound card can't deal with the noise or surpress it becasue of its tiny circuitry and therfor passes it along out the speakers

    I only hear the alternator whine when the car is on and not on battery. That probably means that there is a wrong ground somwhere but it doesn't make itself apparent until the car is on. You can't discount anything in these scenerios.

    Unless you want to work on grounding the the laptop better you might want to try some sort of noise suppressors
    -Jesus- King of Kings Lord of Lords

  7. #7
    Maximum Bitrate falconey's Avatar
    Join Date
    Feb 2004
    Location
    Atlanta
    Posts
    836
    If you wire direct to the battery I think you're problems will be solved. I'm sure it's a grounding issue, but I'm not sure if it's just your lighter adapter or if its the cig lighter itself. That's why you have the helicopter noise that pulses in and out, thats a grounding problem. The reason I think it's also a power issue is because you're getting lines on the screen which ususally means either too much power or too little...most times too little or this could also be related to grounding.

  8. #8
    Maximum Bitrate falconey's Avatar
    Join Date
    Feb 2004
    Location
    Atlanta
    Posts
    836
    Quote Originally Posted by antimatter
    Not necessarily true. the problem is only apparent when the car is on and there is tons of noise surging through the system. Your sound card can't deal with the noise or surpress it becasue of its tiny circuitry and therfor passes it along out the speakers

    I only hear the alternator whine when the car is on and not on battery. That probably means that there is a wrong ground somwhere but it doesn't make itself apparent until the car is on. You can't discount anything in these scenerios.

    Unless you want to work on grounding the the laptop better you might want to try some sort of noise suppressors

    You may be able to minimize your alty whine with some adjustments to your gains. You are right it is probably a ground issue for you as well, but sometimes having the gains set too high will bring in sound. Are you getting it through all the speakers and woofer? A way you can narrow things down is temporarily hook up a speaker to the head unit. See if the head unit produces whine as well. If not then it's probably the amp ground. Wait do you even use a head unit?

  9. #9
    Jesus Freak antimatter's Avatar
    Join Date
    Jan 2004
    Location
    California
    Posts
    4,545
    Take it from me. Do it right the first time, Wire everything properly and don't skimp.
    -Jesus- King of Kings Lord of Lords

  10. #10
    Jesus Freak antimatter's Avatar
    Join Date
    Jan 2004
    Location
    California
    Posts
    4,545
    Well not to hijack this thread...

    First off no HU. Just the carputer

    Secondly my system consists of the following componants
    carputer-->digital coax cable-->surround sound processor-->amp-->speakers

    I am going to do some more troubleshootiung in about 10mins but from what i can tell the problem is between the Surround Sound Processor and the AMP even though i have 1 foot 25 dollar RCA Pheonix Gold Cables
    -Jesus- King of Kings Lord of Lords

Page 1 of 3 123 LastLast

Similar Threads

  1. LCD making noise when connected to laptop.
    By jabba in forum LCD/Display
    Replies: 8
    Last Post: 07-19-2007, 07:10 AM
  2. Noise on audio from laptop
    By pip in forum Laptops, Netbooks, Tablets, UMPCs, etc.
    Replies: 6
    Last Post: 11-24-2006, 08:09 PM
  3. xp install to laptop hdd problem
    By thecrow in forum Newbie
    Replies: 8
    Last Post: 06-15-2005, 04:37 PM
  4. Replies: 11
    Last Post: 12-02-2003, 08:29 AM
  5. What do you think of my playlist??
    By SkinnyBoy in forum Software & Software Development
    Replies: 19
    Last Post: 07-19-2001, 01:51 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •