Having problems with your PC Laptops ?
Noise in audio.
\015 We are building a mini laptop by assembling a Single board computer (SBC), DC-DC converter (24V i/p 5V and 12 V o/p ), LCD, mouse, 4x4 matrix keyboard etc.. for a particular application.We have one more module which is connected to SBC through PC104 and line-in.We have designed a PCB which holds this module and SBC together. It is used for routing lines of pc104, audio, mouse, usb, vga, ethernet etc. It is multi layered and one layer is ground (reference line) itself.We have used 2W audio amplifier ST TDA7268 which takes i/p from line-out and feeds to a 8 ohm speaker.computer is loaded with Windows XP.All the modules work fine when tested seperately..Problem: When the computer is on there is a constant humming noise (loud enough) in the speaker. Also while moving the mouse (no matter usb or ps2) some other noise adds to it. Same is the case if you keep pressing a key in the keyboard.If you mute line-in (in windows) there will be no noise. (but we can't do that as we are connecting our module to line in). Can't just blame on that module because this module is working fine in some other application without any noise.Noise persists u completely dettach the module (dettach its power in, dettach from line in and pc104 of SBC).No matter line in is on or off (in windows).No noise if you connect the module to only power and pc104 (dettach line-in connection). Once Line-in is connected(on board) and make line-in on(windows), noise appears.I think problem is with grounding. We are using 24V DC battery as power supply and there is no earthing. Please help me how to find the source of noise... Also if it is problem with noise how to solve it. (we cant change pcb design)\015
Solder a .001 uf ceramic capacitor between all audio signal lines and ground
Repair Help & Product Troubleshooting for PC Laptops
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.
Suggested Questions/Answers :
Speaker noise logitech 240 makes noises when pc is processing
Logitech X-240 seems love to pickup all RF noise.\015\012Any AM [amplitude modulation] over such RF gets into audio as another noise - some might pick up AM radio signal although won't sound clear at all with some amplifiers [I am serious] - wh ... Logitech X-240 Computer Speakers
Noise in audio.
Solder a .001 uf ceramic capacitor between all audio signal lines and ground ... PC Laptops
Buzzing noise when playing audio in windows 7.
After you installed Win7, did you install new audio device drivers from either the manufacturer of your audio card or motherboard? ... PC Laptops
ADA885 Clicking My ADA885 speaker system I bought from DELL has a clicking sound when I turn on my system. This system has four speakers and a sub woofer. The volume display blinks too. What could be wrong? Thanks. Doug
A few possibilities exist. I would first check all the connections, and wiggle all the connectors and plugs to see if any one of them is causing it including the power cable. Also try to play with the ON/OFF/Volume switch to see if that's intermitt ... Altec Lansing ADA 305 Computer Speakers
Problem with DELL 2408WFP
I have similar problem. I'm using the HDMI connection from my PC to the monitor and when I connect my audio out from the monitor I get hissing and popping sounds along with the audio. It sounds pathetic, I also hear the music and audio al ... Dell UltraSharp 2405FPW 24" Flat Panel LCD Monitor
Loud static burst sound coming from my PA system
My friend, thanks for your effort to put forth the best service you can for your customers and guests.\015\012\015\012I think you may have shot yourself in the foot when you did away with the ground feature. Back in the day ... I grounde ... Gateway M6307 Notebook
Noise from speakers when playing basses
Hi,\015\012\015\012Offhand, could either be the subwoofer speaker itself or the electronics (amp and/or crossover). One way to determine is by physcially checking the sub speaker. When playing with bass on, pls try restricti ... Computer Speakers
Noise from headphones
If I am thinking of the right sound go back into your audio mixer and turn down or off the mic pre amp or gain. On mine I have two preamp setting and one gives me a squealing sound if enabled. \015\012\015\012Usually is labeled "mic boost ... ASUS PC Desktops
Bad audio Recording
... BenQ Joybook A53 Notebook
Thinkpad- interferance Hello , I have a confuzing problem with my thinkpad T30. The problem is noise interference coming out my audio jack. Now when I play music from my TP audio jack to my stereo it sounds fine. When I hook up my s-video to my tv and watch streaming tv I get interference (like scratching n beeping noises when I open n close files n folders). There is always noise though even if I don't touch it, and it seems to react with the processer or hardrive.......anyway I don't get a
You should put or connect a ground line from your stuff connecting to the ground to eliminate noise. ... IBM ThinkPad T43 Notebook
Studio monitor chaos
Hey buddy, this is a common issue with laptops and professional audio equipment, if your laptop is grounded when you plug it in (third prong on your plug or asymmetrical prongs like in Canada), the electrical signal running through your computer will ... M-Audio DX4 Active Studio Monitors (Pair) Computer Speakers
HP Pavillion dv6000
I will begin by reminding you that there's a great variety in the quality of microphones available out there, and point to this as a suspect for the cause of your difficulties. I would recommend, if audio fidelity is a concern, that you use an exter ... HP Pavilion dv6000z Notebook
Interference and noise
You have to open the sub and move the transformer far away from the audio circuit. Seal the holes left by the screws. It will solve the hum problem. I'm not sure about the radio station interference, I used to have that same problem before only when ... Logitech S200 Computer Speakers
I have a 4 month old Dell Studio 1535 laptop, with audio problems
Hi,Firstly check that the microphone level is down or turned off as this sounds like some sort of feedback that's being produced.Check the microphone and try to play music again.Please post backGood luc ... Dell Studio 1535 Notebook
Problem with compaq presario speaker
Usually the driver for the sound system got a little screwed up.\015\012\015\012\015\012According to the documentation; this is what they recommend, however, do not flip out if you have already tried this. Go past this section and I ... HP 2133 Notebook PC
Audio Cracks and Pops and Strange Issue With Network Adapter
Hi,Interesting issue. Let's try the simple ones first:\015\012\015\012Right click on My Computer, left click on Properties, Hardware tab, Device Manager button;\015\012Expand S ... HP Pavilion dv6000z Notebook
I'm using Dragon Naturally Speaking 10.0 and it keeps telling me that the quality of my sound system is poor. It still works but there is a lot of background noise and the accuracy is affected
Turn on your microphone and say "check audio", an audio wizard will appear and prompt you to re-calibrate your microphone. \015\012\015\012A text box will appear, when you hit [Start] the text in the box will appear black and prompt you ... Dell Latitude D600 Notebook
Scratching (static) noise coming from computer speakers
I foudn this in anther forum:\015\012I have an ASUS motherboard P5E3 Premium. The audio that came with it was the Sound Max audio. I also noticed abnormal sounds coming from the speakers. They included sounds during hard drive activity and also ... Dell Dimension 4600 PC Desktop
Alarm/Sound My Toughbook has started making a sound that I don't recognize. At first my power source was pulled out while the computer was on. When I turned it back on an alarm sounded then changed to a continuous "dotting" noise (like a machine gun) and will not stop. All files continue to function properly and I've turned off the alarm notifications and muted all sound, but the noise persists. ANY HELP???
This does not sound related, but I have seen this solve issues like this before.GotoControl Panel > Sounds and Audio Devices > Click the "Audio" tab > click the Volume button for your Sound RecordingAssure that ... Panasonic Toughbook CF-27 Notebook
Sound driver problem
I'm having the same problem i even got the restore disks from hp (presario v2000) xp sp 2 anyhow it keeps not finding the sound card i have been searching all over and even took the laptop apart to see if i could find the chipset name on the board. ... HP Compaq Presario V2000 Notebook
Sound driver problem
HAI\015\012 Hai sir iam Rajesh kumar.R iwant my notebook audiodriver software plz send audiodriver software OR web address my model is compaq presario c700\015\012 thank u ... HP Compaq Presario V2000 Notebook
Sound driver problem
If you haven't already, try opening the sound control from the control panel, make sure the sound settings are ajusted properly and nothing is muted. If you have done this, try looking for a driver at driverguide.com. You will have to register, but i ... HP Compaq Presario V2000 Notebook
I have toshiba L300-254 icanot use the mic systm
\015\012\015\012Hi, these instructions will help you with the Audio problem. These are the steps to setup and 'restore' ... Toshiba Satellite Pro L300-EZ1004X Notebook
No engine noise when viewing aircraft outside the cockpit
Maybe your 're to far away from the engine and you cant hear it, even in real. but i dont think yhats it. check your audio settings.i cant think of anything better, maybe u just need a patch...kilbeam99 ... Microsoft Flight Simulator X for Windows
I have Bose Companion 2 Series ones and the left makes odd noises
> I turn the volume to a low it still has the odd noise\015\012\015\012If there is any drive to the speaker at all (volume not turned off), the rattle is probably coming from a broken 'surround;' the part that keeps the c ... Bose Companion 2 Computer Speakers