Search found 21 matches

by Melchior
Thu Dec 05, 2002 8:13 pm
Forum: Cases and Damping
Topic: NO noise cabinet
Replies: 37
Views: 16001

Why not pass it over to us & become a famous SPCR like LeoV and Rusty? :wink: hehe, well, I picked up a carload of materials from Home Depot today. I spent 3 hours in HD! I think some of the staff there must've caught on the the fact that I was working on a nifty project-- I spent a good hour sitti...
by Melchior
Wed Dec 04, 2002 7:26 pm
Forum: Cases and Damping
Topic: NO noise cabinet
Replies: 37
Views: 16001

Re: tunnel resonance

[quote="wussboy"] I hope you were implying you'd post those and let us take a peek? hint hint. :) [/quote] Of course! ...Actually, currently I'm thinking that after work tomorrow I'll make a run to Home Depot to see how expensive MDF or some other wood-like material is-- if I can afford to make it i...
by Melchior
Wed Dec 04, 2002 6:09 pm
Forum: Cases and Damping
Topic: NO noise cabinet
Replies: 37
Views: 16001

Heh, this quest-for-silence has got to be some sort of a disease in itself. I've just ordered several more Panaflos from BG Micro (to silence other computers in the house that now annoy me as I walk near their rooms), and I'm realizing that my undervolted panaflo-cooled, harddrive-decoupled system i...
by Melchior
Wed Dec 04, 2002 5:02 pm
Forum: Cases and Damping
Topic: NO noise cabinet
Replies: 37
Views: 16001

Mike, regarding the resonant frequencies of your ducts, that implies to me that your damping material may not have been particularly effective-- resonance only occurs if the sound *can* bounce back and forth to give constructive interference. If you can eliminate or nearly-eliminate the sound-bounce...
by Melchior
Tue Dec 03, 2002 10:39 pm
Forum: Cases and Damping
Topic: NO noise cabinet
Replies: 37
Views: 16001

Taking a look at that website, their solution is remarkably-similar to a design that I came up with a couple of years ago as part of a 4-th year project at UBC. The enclosure that I designed had its noise-reducing baffles along the right side of the case, whereas this Cocoon cabinet has it's intake ...
by Melchior
Tue Dec 03, 2002 9:45 pm
Forum: Silent Storage
Topic: How to INCREASE the hard disk noise ??
Replies: 17
Views: 7609

Not quite what I'd expect somebody to ask, but... 1) Not WD, probably not the recent Maxtors, and I think Samsung drives aren't too noisy either. WD is probably a good bet for a fairly loud drive. Don't take my word for it, though, as 2) Hmmm, to make a drive noisier... Well, bolt it directly to the...
by Melchior
Sun Dec 01, 2002 1:30 am
Forum: Silent Storage
Topic: Where can I get Aluminium for my sandwich?
Replies: 7
Views: 4253

The amount of metal you need for your sandwich is really small-- if there's a metal fabricator in your area, stop in and ask them if you could have a look in their scrap bin-- worst-case scenario is they'll say 'no'. I got some neato checker-plate steel from a nearby shop a few years ago while worki...
by Melchior
Wed Nov 20, 2002 9:18 pm
Forum: Silent Storage
Topic: More detailed sandwich questions
Replies: 5
Views: 3295

Incidentally, as I've mentioned in other threads, cork has a very poor noise-reduction coefficient. Medium-density fiberglass (such as that used in ceiling panels-- cheap at home stores) is an **order of magnitude** better than cork at reducing the amount of noise bouncing around.
by Melchior
Wed Nov 20, 2002 9:02 pm
Forum: Fans and Control
Topic: Panaflo fan tail connector same as WOL connector
Replies: 5
Views: 2607

What's a WOL cable? Do you have any links to pictures?
by Melchior
Mon Nov 11, 2002 10:53 pm
Forum: Fans and Control
Topic: Undervolting without resistors
Replies: 11
Views: 4168

Since P=IV (where I is the current flowing through the circuit and V is the voltage drop over the resistor or diodes), you'll have the same amount of waste heat with diodes as you would with a resistor-- I've calculated it out to somewhere in the neighbourhood of 0.4 Watts to undervolt a 12V 0.1A fa...
by Melchior
Sun Nov 10, 2002 2:37 pm
Forum: CPU Cooling
Topic: Heat Spreaders?
Replies: 12
Views: 6777

I don't think that the Athlons are necessarily *that* bad for quiet computing-- certainly they've got higher power consumption than a comparable P4, but they can still be made quiet. I've got an AthlonXP 1600+. I've replaced the stock CPU fan with a Panaflo 80MM L1A (undervolted to ~7.5v). The heats...
by Melchior
Sat Nov 09, 2002 10:22 am
Forum: Power Supplies
Topic: PSU temp measurements??
Replies: 21
Views: 43735

[quote="MikeC"]A basic problem with opening up the PSU to measure temps: the temps change as soon as you remove the cover, as the normal airflow through the case is totally disrupted. I have already measured this effect.[/quote] True, it probably wouldn't be very accurate, though the results could s...
by Melchior
Fri Nov 08, 2002 6:44 pm
Forum: Power Supplies
Topic: PSU temp measurements??
Replies: 21
Views: 43735

[quote="siliconacoustics"][quote]Many other points in the post are right-on, but this one skipped a beat. [b]Total heat in = Total heat out.[/b] The smaller [i]heatsink[/i] will get hotter because it's shedding the same watts in less area. The hotter heatsink might fiddle the electrical performance ...
by Melchior
Wed Nov 06, 2002 4:46 pm
Forum: Silent Storage
Topic: The Ultimate HD Sandwich (well, maybe)
Replies: 11
Views: 5286

Several things should go into a drive-isolation design. An important consideration is that the metal will not absorb much/any sound itself-- rather, the sound will reflect within the drive enclosure (the sandwich plates). The purpose of the foam/fiberglass within the sandwich is to reduce the intens...
by Melchior
Sun Nov 03, 2002 10:21 pm
Forum: Silent Storage
Topic: The Ultimate HD Sandwich (well, maybe)
Replies: 11
Views: 5286

A note as far as sound transmission coefficients goes is that lighter and stiffer materials will transmit sound more effectively. Lead is highly-effective at stopping sound since it won't re-radiate very much at all. Steel is also good, copper would also be good. Aluminum isn't as ideal, although it...
by Melchior
Mon Oct 28, 2002 5:38 pm
Forum: SPCR Article Discussion
Topic: Who has a incorrectly displayed chart in heatsink article?
Replies: 7
Views: 6905

The computer that I'm sitting at right now has IE6, and the chart displays incorrectly.

(Normally I use Netscape 6, but my normal machine is currently undergoing a stress-test to see if I have adequate cooling with the nice and quiet Panaflo fan that arrived in the mail today...)
by Melchior
Fri Oct 25, 2002 11:09 pm
Forum: Cases and Damping
Topic: Sound dampening materials?
Replies: 11
Views: 9371

In a computer noise research project I did a couple years ago, I found that adding sound-deadening material in most cases had very little effect on noise levels outside of the case, and for some frequency bands, noise outside the case actually increased. If you're looking for sound deadening materia...
by Melchior
Thu Oct 24, 2002 9:25 pm
Forum: Fans and Control
Topic: Disappointed with Panaflo performance
Replies: 14
Views: 5693

icchan, I don't think the 7v mod could be harmful/stressful to the PSU. A resistor is a passive component, and all you're doing is sticking it in front of the fan-- it won't appreciably increase power consumption (the resistor will likely be dissipating something in the neighbourhood of 0.5-0.8 Watt...
by Melchior
Wed Oct 23, 2002 4:27 pm
Forum: Fans and Control
Topic: please check my Enermax PSU voltages
Replies: 6
Views: 3205

One other thing you may want to try is updating your virus scanner and checking for viruses-- some backdoor-type trojans can allow an attacker to reset the machine. I had an issue for a while with my server rebooting randomly (a 300MHz machine with no heat problems, voltages all within spec), which ...
by Melchior
Sun Oct 20, 2002 8:33 pm
Forum: The Silent Front
Topic: SPCR featured in local Vancouver paper
Replies: 6
Views: 3188

I managed to find my report on an old backup CDROM. I tossed it on my website and I've thrown together a quickie webpage for it:

http://mtrs.org/MTRS/noisecontrol.html
by Melchior
Sun Oct 20, 2002 4:22 pm
Forum: The Silent Front
Topic: SPCR featured in local Vancouver paper
Replies: 6
Views: 3188

Last night I was out for dinner with a friend whom I hadn't seen in months, and she suggested that I pick up the Georgia Straight since it had an article about computer noise, and she remembered that I have an interest in noise control. This morning I picked up the Straight, read the article, and wa...