The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
Yesterday at 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 10
Trumpy 8
Texas_Ranger 8
sparkyinak 7
Who's Online
0 registered (), 82 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#131646 - 11/06/03 08:52 AM Noisy Computer?.
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Here's a little story that caught my eye when I was checking out the news at the Xtra home page that I have on my computer.
http://www.xtramsn.co.nz/technology/0,,7004-2802891,00.html
I for one,know that my computer power supply fan is a bit on the noisy side, but I've more or less learnt to live with it.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
Test Equipment:

Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

#131647 - 05/19/05 07:56 AM Re: Noisy Computer?.
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Sorry but that link has long gone, but I can't help but think that my hearing is suffering by the High Frequency sound from my computer fans.
As in the CPU fan and the PSU fan.
I've cleaned both of them and the sound is still the same if not worse.
There is a pronounced 1kHz tone coming from the case and I'd invite comments on how to get rid of it.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#131648 - 05/19/05 08:48 AM Re: Noisy Computer?.
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
Mike

Are you sure the sound you are hearing is not coming from the hard drive? Many consumer hard drives do not use fluid bearings and after time can get very loud. I would try disconnecting the CPU fan then starting up the system to see if it was causing the noise you are hearing. Don’t run the system very long with the CPU fan disconnected or you will damage the processor. Also try starting the system with the power cable disconnected from the hard drive. If the noise is still present then the sound is probably coming from the PSU. Check your video card since higher end video cards have small fans that can become very loud over time.

If your system only has 2 fans it should be very quiet. My system is pretty quite but I have 2-PSU fans, 1-CPU fan, 1-video card fan, 3-case fans, 1-7200 rpm hard drive and 2-10,000 rpm hard drives.

Curt
_________________________
Curt Swartz

Top
#131649 - 05/27/05 11:00 PM Re: Noisy Computer?.
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Gidday there Curt,
Thanks for your thoughts.
I know it's not my HDD, it makes a rumbling sound when it bursts into life and only does this every once in a while.
The CPU fan is as quiet as a mouse.
I'm leaning more towards the PSU fan causing all the noise, it's started to make a heck of a racket when I first switch the computer on, in fact not un-like having a horde of angry bees inside the case.
But after the computer has been on for a minute or so, the noise goes away and I'm left with a high pitched tone as I mentioned above.
The PSU is a 400W Enermax and I can't say I've had any problems with it up until this came along.
Wierd, if you ask me.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#131650 - 05/28/05 06:14 AM Re: Noisy Computer?.
jooles Offline
Member

Registered: 09/18/04
Posts: 98
Loc: brussels, belgium
PSUs are not expensive to replace and any computer shop ought to keep them in stock. But before you do that I would certainly check that it really is the PSU by detatching everything else and running it on its own.

I keep an ageing G3 iMac in the living room purely as an MP3 jukebox. It is probably the last completely convection-cooled, fanless computer there will be. Makes no noise at all except for whichever album it is playing at the time :-)

Top
#131651 - 05/28/05 07:07 AM Re: Noisy Computer?.
chipmunk Offline
Member

Registered: 07/20/04
Posts: 142
Loc: Southampton, UK
Trumpy, rumbling from the fan in the PSU probably means dry bearings, especially if it deteriorates to rumble at odd moments then those moments become longer.. and so forth. It's possible to switch out the fan in the PSU, but may not be worth your time as PSUs are cheap. I wouldn't advise most people to go poking around in a power supply, but then most people don't do linework .
A temporary fix may be this .

Top
#131652 - 05/29/05 09:16 PM Re: Noisy Computer?.
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
jooles, chipmunk,
Thanks for your advice, I've had my computer in pieces and it is the fan in the PSU.
I think it could be on it's last legs.
No worries though, I've got plenty of them here that I can use as spares.
Just a little note, while I had the case cover off, I had the TV on in the background, I happened to turn around and look at the screen and it was really messed up with all sorts of Herringbone patterns, I put the cover back on and they went away.
Just goes to show what metallic sheilding can do, eh?
I'll throw another fan in the PSU on my next day off.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#131653 - 05/30/05 09:35 AM Re: Noisy Computer?.
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
"Just a little note, while I had the case cover off, I had the TV on in the background, I happened to turn around and look at the screen and it was really messed up with all sorts of Herringbone patterns, I put the cover back on and they went away.
Just goes to show what metallic sheilding can do, eh?"


That is a sign of a poorly designed system board. I have 2 machines within 6 feet of my TV (one directly under it) and niether cause any problems at all. They are in wooden cases.
_________________________
Greg Fretwell

Top
#131654 - 05/30/05 11:48 AM Re: Noisy Computer?.
chipmunk Offline
Member

Registered: 07/20/04
Posts: 142
Loc: Southampton, UK
The amount of interference also depends on the age and speed of the system. A pentium III 500MHz system is *really* good for messing up UHF tv reception, especially around the 500MHz area...

Top
#131655 - 05/30/05 08:35 PM Re: Noisy Computer?.
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
The core frequency of the CPU is not going to be where the interferance will be. It will be the bus speed. This is limited if the designer has good grounding and signal transmission practices on the board. I would actually expect more noise from the switcher in the power supply. That was where most of the 370 era computer room "noise" came from. That was what most folks didn't understand when they were doing all that bonding. The thing they were protecting the computer from was the computer itself.
_________________________
Greg Fretwell

Top
Page 1 of 2 1 2 >



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals