Search found 131 matches

by BillTodd
Thu Feb 28, 2008 12:24 pm
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

The primary noise is from fans. this is debatable; okay, modern 3.5" and 2.5" HDD have come a long way in terms of quietness, It's always possible to encase HDD's, use solidstate or remote drives to remove that source. There is another reason to avoid fans in quiet systems... In accoustics or elect...
by BillTodd
Wed Feb 27, 2008 4:29 pm
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

I can only speak from the experience of my 'silent' pc, but once you've heard (or rather not heard) a really quiet machine it's hard to compromise and add even a single fan;- While I was experimenting with the p4 version of my machine, I tried adding an 80mm fan ticking over at <5v . It was clearly ...
by BillTodd
Wed Feb 27, 2008 8:06 am
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

=> Don't even bother with a single heatsink...Maybe have 4x heatsinks and heatpipes? You can use a single heatsink, if you choose one optimised for point source use: e.g. http://www.aavidthermalloy.com/cgi-bin/euro_exdisp.pl?Pnum=0000D&LengthUnits=mm&ExLength=150.00&TReff=0.411 [This is only an exa...
by BillTodd
Tue Feb 26, 2008 4:42 pm
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

ok, so, you've 95 watts to get rid of, at less than 71'c at the source. Assume 30'c ambient inside the case, you need to dissipate 94w with less than 41'c drop 41/94 = 0.43 K/w absolute maximum between the cpu and the air. this has to include the thermal resistance of each interface, the heat-sink i...
by BillTodd
Mon Feb 25, 2008 5:45 am
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

Heat flows down hill
:lol: :lol:
by BillTodd
Mon Feb 25, 2008 5:09 am
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

First ,you need to get a grasp of the science involved in this. For instance: What about the loss of efficiency caused by having a heatpipe between the CPU and large heatsink There is no loss of efficiency, there is just additional thermal resistance (and, with heat pipes, an upper thermal limit) (T...
by BillTodd
Sun Feb 24, 2008 9:29 am
Forum: The Silent Front
Topic: Is a fanless PC possible?
Replies: 36
Views: 24725

2.53GHz P4 (SL682 in ga8-siml mobo) under test on the bench at the moment. Sitting at about 50'C (~+30'C) @ 100% CPU useage. http://homepage.ntlworld.com/bill_todd/test/spc2.jpg The copper block is just a counter balance; the whole thing is balancing on the CPU . I hope to use about half of the abou...
by BillTodd
Fri Feb 22, 2008 8:29 am
Forum: The Silent Front
Topic: Is a fanless PC possible?
Replies: 36
Views: 24725

3.4W idle, 33.4W load. A Fanless Ninja or Orochi is sufficient i think. That's about the same power output level as the 1GHz P3 in my silentPC project, so I think it's possible. I used a 1K/W industrial heatsink, since it is better suited to fanless operation than most PC CPU heat-sinks. If the Nin...
by BillTodd
Fri Jan 04, 2008 8:33 am
Forum: General Gallery
Topic: Exclusive low-end office PC - wood + steel.
Replies: 50
Views: 23049

Very nice looking case :) The grill might look better if you routered out a rebate on the inside, so the grill is closer to the out-side of the box. This should give the impression that the box is made of thinner, sleaker, material. I did the same to the top panel of my PVR box. The top is actually ...
by BillTodd
Wed Dec 12, 2007 6:18 am
Forum: Silent Storage
Topic: HD logic board swap?
Replies: 8
Views: 2358

I always thought the "freezer technique" was something of an urban myth
I recovered data from a drive that had an overheating controller chip after a couple of freezer sessions. It can work.
by BillTodd
Fri Nov 02, 2007 8:23 am
Forum: The Silent Front
Topic: Silent(?) Ion fan
Replies: 5
Views: 3504

:shock: :shock: :o :P The author doesn't mention whether this thing makes any noise, and/or if it makes ozone? Well, it will be devoid of mechanical noise and vibration. The only noise it should produce is from turbulence, the author doesn't state any estimate of flow rate, but I guess it would onl...
by BillTodd
Sat Oct 06, 2007 12:48 pm
Forum: General Gallery
Topic: Finally 0dB [inaudible] Sonata
Replies: 9
Views: 5037

Here we go again.... 0dB is simply a ratio of 1:1 [Mod: a ratio of what to what?] [edit:] A ratio of any number (usually representing signal power or level) to another. Bels are a useful means of scaling a number with huge range into something easier to handle (e.g. 0 to 12Bels = 1 to 1,000,000). To...
by BillTodd
Thu Aug 30, 2007 3:04 am
Forum: Silent Storage
Topic: Variant "Homebrew" Hard Drive Enclosure
Replies: 9
Views: 3354

But if you leak water on your computer components you are screwed. Oh yes:), the water starts off non-conducting, but as contaminants disolve into it, it starts to conduct so, if the machine is powered, eletrolosys will rapidly destroy the board! Non-conductive cooling fluids are designed so that a...
by BillTodd
Wed Aug 29, 2007 5:36 pm
Forum: Silent Storage
Topic: Variant "Homebrew" Hard Drive Enclosure
Replies: 9
Views: 3354

a non-conductive water cooling fluid like Fluid XP+ Ultra or something? Hmmm, water, pure water, is non-conductive. (I wonder what magically substance they add to the water? - probably a ph balancer of some description) If you want to play with different viscosities just use wall-paper paste (methy...
by BillTodd
Wed Aug 29, 2007 6:48 am
Forum: Silent Storage
Topic: Variant "Homebrew" Hard Drive Enclosure
Replies: 9
Views: 3354

Re: Variant "Homebrew" Hard Drive Enclosure

http://www.silentpcreview.com/files/images/alleycat/index.html My idea starts with this SPCR member's concept of gel-packs cushioning the drive inside an enclosure which I will then suspend in the case. Here's what I'm thinking. I want to use some heat-sealable anti-static bags. I was thinking of m...
by BillTodd
Thu Aug 02, 2007 3:32 am
Forum: General Gallery
Topic: The Skyscraper Photo PC
Replies: 28
Views: 12839

You're an artist with a real eye for detail (that light pine/beach veneer trim sets it off perfectly :))

Are the chrome 'switches' operational? (if not, have you seen these qprx touch sensor ics? http://www.qprox.com/products/qtouch.php )
by BillTodd
Tue Jul 24, 2007 3:15 am
Forum: Fans and Control
Topic: Interesting fan
Replies: 9
Views: 3987

Interesting fan

I thought you might like to see a interesting fan design that I found in a Sony LCD back-projection TV. http://homepage.ntlworld.com/bill_todd/test/fan1.jpg I was impressed how quiet it was and how much air it moved while running at full speed. It's an 80mm fan made by: http://homepage.ntlworld.com/...
by BillTodd
Thu Jul 12, 2007 2:24 am
Forum: General Gallery
Topic: Watercooled P180
Replies: 27
Views: 14434

Bill, you should monitor core 0 and core 1 temps. The CPU temps are not accurate. They're actually Zoob's temperatures :) I was just curious as to why SpeedFan's graph seems to be clipped. (I'm guessing it's because it rounding to integers, although if it is, it really shouldn't display the slopes ...
by BillTodd
Thu Jul 12, 2007 2:13 am
Forum: General Gallery
Topic: Watercooled P180
Replies: 27
Views: 14434

Anyone know why this speedfan graph shows clipped peaks at about 47'C ?

Image


You seem to have the rear-case fan AND the two radiator fans blowing into the radiator. Is that wise?
by BillTodd
Tue Jul 10, 2007 2:22 am
Forum: Silent Storage
Topic: soft mount vs. performance
Replies: 35
Views: 14794

I thought you may be interested in what I did to address my "imaginary" sound problem. I wasn't suggesting your sound problem was imaginary. However, your suggestions for the mechanism are (how can I put this politely?) unrealistic . Uncorrected errors from HDDs have to be vanishingly small (a PC c...
by BillTodd
Mon Jul 09, 2007 11:16 am
Forum: Silent Storage
Topic: soft mount vs. performance
Replies: 35
Views: 14794

With that, I'm going to bow out of this thread, as I know how these things end up (badly)... I had prepared a long reply to WR304's previous post but... I think I'll acknowledge your superiour judgment and bow out myself :) BTW I've spent the last 30 odd years in the pro-audio business, much of it ...
by BillTodd
Sun Jul 08, 2007 11:40 am
Forum: Silent Storage
Topic: soft mount vs. performance
Replies: 35
Views: 14794

Isolator Impacts on Seek Settling "The major problem created when mounting a drive on isolators is the additional motion in the drive’s baseplate at seek settle. This condition is commonly called the wind-up mode. The isolators are springs that allow the drive’s baseplate to rotate when the tor...
by BillTodd
Sat Jul 07, 2007 7:22 am
Forum: General Gallery
Topic: example cad dwg files for cnc cutting
Replies: 10
Views: 4638

If you already have the heatsink and all you want to do is a few basic cuts, don't get it CNC'ed, just cut it with a hacksaw. That's what I'd do :) I cut the heat-sink for my PVR with bench saw (wood saw). Just make sure you lubricate the blade. The Edges were pretty good, didn't require much finis...
by BillTodd
Fri Jul 06, 2007 3:35 am
Forum: General Gallery
Topic: example cad dwg files for cnc cutting
Replies: 10
Views: 4638

Well, that drawing alone would not be sufficient for me to make it! Initially it looks like you are dividing the heat-sink into six parts, but you have a confusing/misleading vertical red line that only partially bisects the part. There are large white rectangles which are presumably hidden detail (...
by BillTodd
Wed Jul 04, 2007 3:26 am
Forum: Silent Storage
Topic: Homebrew drive enclosure
Replies: 111
Views: 88225

I have to say the idea of using a gel pack to reduce impact damage never occured to me. Indeed, the incompressible nature of liquids and gels would seem to rule them of for this purpose. Sony seem to have designed a wrap-around shock-absorber/damper for HDDs. It will be interesting to see how they'v...
by BillTodd
Mon Jul 02, 2007 6:15 am
Forum: General Gallery
Topic: Dust Control ... Air Filters ... another example.
Replies: 28
Views: 21987

BF,

You have a real dust problem there; I'm concerned for your health :shock: :lol:

Have you concidered electro-static filters? (active ones rather than electret type)
by BillTodd
Mon Jul 02, 2007 6:11 am
Forum: Fans and Control
Topic: 220mm Fan Mods..Finishing the Project.
Replies: 57
Views: 22907

I'm not sure if I can explain it correctly......but the case gets plenty of airflow at low noise levels, but not the sort of ideal airflow that cools CPU heatsinks very well. If the heatsink were taller, and closer to the big fan.......I don't think the 92mm fan would be necessary (assuming the sam...
by BillTodd
Fri Jun 01, 2007 10:04 am
Forum: Off Topic
Topic: cooling: Peltier thermoelectric modules??? anyone?
Replies: 6
Views: 2880

I'm with Rusty on this one. One option I was considering was to use a large peltier device to raise the relatively cool temperature of a water cooled PC to the higher temperature of a Domestic Hot Water tank. Here, the inefficiency of the peltier pump simply adds to the heating of your DHW (if the D...
by BillTodd
Sun May 20, 2007 9:36 am
Forum: Off Topic
Topic: EXECUTION OF NINJA MURDERER (REV. B) [thread probation]
Replies: 65
Views: 27026

could this be possible?... signs of empathy / trust from another person? -emotional tears- i don't know exactly why it failed, on paper it looks really good. Im starting to believe it has something to do with the copper base not making proper contact with the inner heatpipes / rest of the structure...