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Tator Tot's Big "Quiet" 120mm & 140mm Fan Round-Up - Page 175

post #1741 of 2743
Quote:
Originally Posted by doyll View Post

Isn't that actually the 12v power pulse to motor that is triggered by PWM signal to the IC?

I know Noctua's advertising blurb call it "signal" but to be a signal does not power anything.. it signals something that provides the power.. in the case of a PWM fan it signals the IC in fan housing that than sends 12v pulses to fan. And in Noctua fans it's not a square pulse but is "ramped" (gradually applies 12v pulse versus instantaneous 12v pulse) to try stopping fan tick caused by the instantaneous 12v pulse.

Or is my layman's understanding of PWM wrong?

I don't know much about fans, but I agree. That looks to me like the waveform that's driving the fan, not the PWM input.

They're kind of not that specific about the rise times and so on... Also, I wouldn't be shocked if somebody else were doing something similar. Or rather, it's not like any square waves have infinitely sharp edges to begin with. There's got to be a range of behaviors.

Funny how an intentionally low slew rate is kind of desired here, whereas many applications are looking for higher speed.
post #1742 of 2743
Hey Tator Tot.
Sorry for writing again. It looks like there are many options of the Silentwing fans. Shadowwings, Silentwings 2 and Silentwings pure. Also the Silentwings 2 as you suggested, the PWM model of the Silentwings 2 got more fan blades. Can you tell me which one is optimised for a heatsink?
It's really confusing redface.gif
Edited by Zillerella - 5/12/13 at 12:03pm
    
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post #1743 of 2743
http://www.jimms.fi/listaa/1111

Which one would you guys pick for a 420mm rad?
Push or pull on http://www.jimms.fi/tuote/ALC14179
post #1744 of 2743
Quote:
Originally Posted by mikeaj View Post

I don't know much about fans, but I agree. That looks to me like the waveform that's driving the fan, not the PWM input.

They're kind of not that specific about the rise times and so on... Also, I wouldn't be shocked if somebody else were doing something similar. Or rather, it's not like any square waves have infinitely sharp edges to begin with. There's got to be a range of behaviors.

Funny how an intentionally low slew rate is kind of desired here, whereas many applications are looking for higher speed.

Diverting off to a tangent here sort of so I'm going to put this in a spoiler. wink.gifWarning: Spoiler! (Click to show)
Quote:
Adopting Noctua’s Smooth Commutation Drive (SCD) technology, the custom designed NE-FD1 PWM IC slows down the slew rate of the
output signal in order to give a smoother, less sudden torque impulse.

I think the likely difference is the slew is intentional to deal with the mechanical impulse & rise/fall time are dragged out. It's marketing drivel though smile.gif

And square waves can have overshoot and such

I found this nice PDF on "Suppressing Acoustic Noise in
PWM Fan Speed Control Systems" http://ww1.microchip.com/downloads/en/AppNotes/00771b.pdf

and TI has a diagram on a PWM PDF looking like this

Back to your regular dose of Tater Tot.
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post #1745 of 2743
Quote:
Originally Posted by Zillerella View Post

Hey Tator Tot.
Sorry for writing again. It looks like there are many options of the Silentwing fans. Shadowwings, Silentwings 2 and Silentwings pure. Also the Silentwings 2 as you suggested, the PWM model of the Silentwings 2 got more fan blades. Can you tell me which one is optimised for a heatsink?
It's really confusing redface.gif

Silent Wings 2
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post #1746 of 2743
Quote:
Silent Wings 2

A reason please? Because the Shadow wing looks better in specs wink.gif

Thanks smile.gif
    
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post #1747 of 2743
Thanks AlphaC. Interesting information. thumb.gif
post #1748 of 2743
Quote:
Originally Posted by Zillerella View Post

A reason please? Because the Shadow wing looks better in specs wink.gif

Thanks smile.gif

It is the other way around. The silent Wings 2 is the top model from Be Quiet and have the best specs. If you look at their top CPU cooler The Dark Rock pro 2 (which has very high review ratings) they also use the silent Wings 2 for that model.

The Shadow Rock is also a good fan for the price but a little bit cheaper. I do not have any experience with the Silent Wings pure, but they are nothing special and than I would rather chose the Gelit Silent wings I Guess.

Look also to this review below, from which I think it is very helpful. It is in French, but you can use Google translate of course, unless when you speak French yourself.

http://www.hardware.fr/articles/886-1/comparatif-ventilateurs-140mm.html
Edited by rows - 5/13/13 at 5:19am
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post #1749 of 2743
Okay, so I will get some silent wings 2 for my phanteks ph-tc12dx if the stock fans are rubbish. And sorry, but cant use 140mm in my case, but anyway thanks for the link wink.gif
    
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