Search found 135 matches

by pcy
Sat Feb 28, 2009 5:34 am
Forum: Fans and Control
Topic: cooler master or yate loon
Replies: 16
Views: 3642

Hi, The current fans are very loud 80mm that are currently undervolted but provide very little cooling and are not silent. I will mod the case and components so a larger fan would also work in some places. That has to be the way to go. While some fans are better than others, the differences pale int...
by pcy
Sat Feb 28, 2009 3:22 am
Forum: Fans and Control
Topic: cooler master or yate loon
Replies: 16
Views: 3642

Hi, The best deal is the link in your first post. There is nothing wrong with Yate Loon fans. Thay are cheap because Yate Lon is the genuine manufacturer and only one middle man - Xoxide.com is involved. Fans actually cost soemwhere between $1 and $1.50 to make, whatever the fan. Peter Peter
by pcy
Fri Feb 27, 2009 1:54 pm
Forum: Fans and Control
Topic: cooler master or yate loon
Replies: 16
Views: 3642

Hi, Well, Neil recommended a 1200rpm Slipstream because at 800rpm SPCR found it quieter than the stock 800rpm version. I'd expect to find that the two fans were essentially identical, with the lower rpm variant simply having fewer windings per coil. If I'm right it's possible that SPCR findings are ...
by pcy
Fri Feb 27, 2009 10:05 am
Forum: Power Supplies
Topic: Is 110W enough?
Replies: 7
Views: 2397

Hi,


Probably... but as you don't mention what CPU you plan to use it's hard to be certain.


Peter
by pcy
Fri Feb 27, 2009 7:17 am
Forum: Fans and Control
Topic: Nanoxia PWMX Controller - Control 3-pin fans via PWM
Replies: 15
Views: 15021

Hi, By contrast the PaQ PWM->DC unit has a control on the min speed, but not on the max (100%) fan speed. I would tend to control the max speed simply by buying a fan whose max speed was whatever I wanted. If you do that you get fan speed control at both ends. We developed the PaQ unit because we ne...
by pcy
Fri Feb 27, 2009 7:05 am
Forum: Fans and Control
Topic: cooler master or yate loon
Replies: 16
Views: 3642

The low speed Yate Loons are the best of that line, but the Nexus (made by Yate Loon) is much better. You don't know what the difference is do you. I buy my fans direct from Yate Loon, and I have to spec what I want anyway - every fan they manufacture is made to order - so if I could specify whatev...
by pcy
Thu Feb 26, 2009 11:04 am
Forum: Fans and Control
Topic: Nanoxia PWMX Controller - Control 3-pin fans via PWM
Replies: 15
Views: 15021

Hi, That unit looks nice and its 2/3 the price of mine - depending on how much they charge for delivery, of course, which my price includes (for the UK). I figure they have gone for a high volume production process. But it's scarcely new. Here is the User Manual for the PaQ Unit: http://www.paqt.co....
by pcy
Thu Feb 26, 2009 3:33 am
Forum: Fans and Control
Topic: Solo exhaust fan, why is this so hard?
Replies: 6
Views: 2914

Re: Solo exhaust fan, why is this so hard?

Why is picking a fan so difficult? OK... I appreciate this was a rhetorical question, but there is answer and it isn't 42. It's hard because you are trying to solve a quantitive problem by purely qualitiative means. If you want to know how much airflow you need through your case, you need to work o...
by pcy
Tue Feb 24, 2009 8:16 am
Forum: Fans and Control
Topic: Please do a PWM fans roundup!
Replies: 32
Views: 12877

Hi, What would be nice is a PWM relay controller. It would plug into the mobo header and the PSU 12v, getting PWM info and adjusting the dc output from the PSU to match the mobo's intended PWM fan output. Then we could run multiple constant dc fans at via mobo PWM control. I don't understand why you...
by pcy
Tue Feb 24, 2009 3:07 am
Forum: Fans and Control
Topic: PWM to Voltage bridge
Replies: 43
Views: 37943

Hi trident,


You can buy one of our PWMs off the website provided you have a credit card. We send these all over the world by signed for air mail.

Let me know it that's a problem for you. We do plan to make all our products available in the US.


I'll search out the cct



Peter
by pcy
Mon Feb 23, 2009 1:16 pm
Forum: Fans and Control
Topic: PWM to Voltage bridge
Replies: 43
Views: 37943

Hi,


Thanks for explaining that.


So, my design with:
four transistors
one capacitor
one zenner diode
one variable resistor
seven ordinary resistors


may be cheaper to build, then?



Peter
by pcy
Mon Feb 23, 2009 3:16 am
Forum: CPU Cooling
Topic: Best cpu cooler for vertical airflow?
Replies: 5
Views: 2191

Hi, The best way to point the fan depends on the case. All that matters is that the hot air coming off the CPU cooler is directed out of the case, and not allowed to-recirculate. (note: same applies to any component that creates a lot of heat - e.g. Graphics Cards). As you can see from my sig, I mak...
by pcy
Mon Feb 23, 2009 2:53 am
Forum: Fans and Control
Topic: 500-800RPM target: Scythe 120mm S-Flex SFF21D or SFF21E?
Replies: 11
Views: 3826

Re: 500-800RPM target: Scythe 120mm S-Flex SFF21D or SFF21E?

Hi, 400rpm to 700rpm - get the 1200rpm version. 800rpm - get the 800rpm version. 700rpm - both are OK. Overall, I would go for the 1200rpm version. I think you may be seeing sample variation in the manufacturing process here, not an actual difference between models. In my experience two such fans wi...
by pcy
Mon Feb 23, 2009 2:39 am
Forum: Fans and Control
Topic: 500-800RPM target: Scythe 120mm S-Flex SFF21D or SFF21E?
Replies: 11
Views: 3826

Hi, Does anyone know what RPM the SFF21E (1200rpm version) spins at with the 5V and 7V mods (ie. undervolting without a fan controller)? Seek and ye shall find ;) 7V = 610RPM/32CFM 5V = 410RPM/14CFM In fact, as those figures demonstrate, both fan speed and CFM vary idirectly n proportion to input vo...
by pcy
Mon Feb 23, 2009 2:32 am
Forum: Fans and Control
Topic: PWM to Voltage bridge
Replies: 43
Views: 37943

Hi, I had the same problem - we needed PWM-DC converters for the CPU cooling on the PaQ case. So I had a circuit designed, and we now sell them separately as well. http://www.paqt.co.uk/store/index.php?act=viewProd&productId=5 http://www.paqt.co.uk/docs/PaQ_PWM.pdf Note: the pics are old, we now hav...
by pcy
Fri Feb 20, 2009 2:02 pm
Forum: Fans and Control
Topic: Front, back, top fans...
Replies: 26
Views: 7587

Hi, In order to achieve your objectives you need to adopt a quantitive approach, and actully figure out how much airflow you need., and where the air needs to go inside the case. Sorry to be harsh, but statements like I guess the idea of using high CFM as intake is good.. so while true, contain no u...
by pcy
Fri Feb 20, 2009 1:17 pm
Forum: Fans and Control
Topic: Quiet 140mm Fans?
Replies: 35
Views: 15889

Hi, I could tell from both the tone it produced, and the frequency of the ticking / hissing that it was running at about 1000rpm at idle (high, but even so, the noise was terrible). Believe it or not, when it reached beyond 1300rpm or so the noise seemed to disappear and it became smoother. I don't ...
by pcy
Fri Feb 20, 2009 8:49 am
Forum: Fans and Control
Topic: Series fan wiring effect on RPM monitor
Replies: 3
Views: 1983

Hi,

That makes sense, and I thnk I tried it once and found that it worked.

However, I think I'd tend to run the fans at either 5V (5V to ground) or 7V (12V to 5V) in parallel.



Peter
by pcy
Fri Feb 20, 2009 8:27 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Hi, Indeed, I used to get Yate-Loons from Jabtek in the US before I went straight to China. If you are only buying a few at a time you are at he mercy of the local channels of distribution. I can't change that, but knowing what the real cost are sometimes helps to direct the search for better value....
by pcy
Fri Feb 20, 2009 6:50 am
Forum: Fans and Control
Topic: Quiet 140mm Fans?
Replies: 35
Views: 15889

Hi, The M12 was probaly a fan rated at 1500 rpm @ 12V. If it was running at anything like that speed I can well believe it became noisy. You should not need to run a 140mm fan at above 800 rpm to keep a reasonable PSU cool. I have a Seasonic S-12 430W which I have modified by fitting a 140mm fan. At...
by pcy
Fri Feb 20, 2009 6:44 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Hi, Even at 22% VAT the 140mm fans I get from Yate Loon would cost under $4. Admittedly I buy them about 400 at a time - you cannot just buy one fan straight from China. And equally, unless you buy in reasonable quantity, transport will push the price up. But even so, a well organized distribution n...
by pcy
Fri Feb 20, 2009 6:16 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Hi, Manufacturing doesn't cost much, neither does actually transport... What do cost are taxes and especially VAT in Europe... Not really - there are no import taxes on fans, and even including VAT the 140mm Yate Loon fan I use in the PaQ case cost only about $3.50. Indeed, Scythe are a Japanese com...
by pcy
Fri Feb 20, 2009 4:50 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Hi, The reason for these price variations is all marketing and distribution. Normal 120mm or 140mm Fans cost well under $2 to manufacture. If you buy in bulk straight from the manufacture they would typically cost $3 landed and delivered in the EU or USA. Many are re-badged, which might easily doubl...
by pcy
Tue Feb 17, 2009 4:16 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Indeed, I could have sworn I typed in madshrinps.com So if I sent you some Yate Loon 120 or 140mm fans would you want to include them on your test. I'm currently testing a Xigmatek S1384 and S1283 for use in my 5U format PaQ cases, both with 140mm fans rather than 120. The theory is that the 1283 wi...
by pcy
Tue Feb 17, 2009 4:09 am
Forum: Fans and Control
Topic: Quiet 140mm Fans?
Replies: 35
Views: 15889

Hi,

I have to admit that I have not found this to be a problem.

For the same airflow, the 120mm fan has to run at about 40% higher rpm. Bearing load is proportional to the square of the rpm, so the 140mm fan running at lower speed should be fine despite teh greater mass of it's fan blades.



Peter
by pcy
Tue Feb 17, 2009 3:59 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Hi,


Intereting.


Those temps were with the Scythe Zipang? so the balance might shift when using a cooler with more open fins?


You're up early, or do yo ulive in Europe?



Peter
by pcy
Tue Feb 17, 2009 2:52 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Hi, They are the quietest at low speed for the most air moved I've found. . as a casefan :)[/i] By "as a casefan" do you mean: 1. A CPU cooler fan is working against a much higher backpressure than a case fan so the performance rankings might change? 2. Or are you simply referrring to the available ...
by pcy
Mon Feb 16, 2009 9:34 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

no single test setup will ever cover all bases; but it would take an enormous amount of time and resources to test pressure, CFM, noise in different situations (as case fan, as radiator fan, as CPU heatsink with small fins, large fin) the possibilities are limitless; you have to draw a line somewhe...
by pcy
Mon Feb 16, 2009 9:13 am
Forum: The Silent Front
Topic: Positive or Negative pressure?
Replies: 25
Views: 13428

Hi, It makes no difference. All that matters is pressure difference. The pressure differences we are talking about are tiny in relationship to Atmospheric Pressure, so there is no significant impact on air density to consider. In consequence the only thing the air is sensitve to is the pressure diff...
by pcy
Mon Feb 16, 2009 9:03 am
Forum: Fans and Control
Topic: Madshrimps - 120mm Fan Roundup - 35 Models Compared
Replies: 59
Views: 41671

Hi, Given the huge number of fans they did test, the absence of Yate-Loon is disappointing. Yate-Loon are a major fan manufacturer, whereas many of the fans that were tested are re-badged and made by someone else. Maybe some were in fact Yate-Loon... Just for the record, I should declare my interest...