A $55 blow - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: June 10, 2017, 11:33:01 pm
content: I have a box of 120mm*38mm, 12V 1.66A Delta fans, and while I was testing one, I powered it off, waited for a few seconds and tried to stop the already decelerated blade with my finger, and I lost a small chunk of flesh.I would like to see someone poking their fingers to this thing...

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 11, 2017, 01:21:39 am
content: Pretty sure anyone who has worked on modern PCs has done that at least once. High powered fans have been in consumer PCs since the P4 era.

author: Red Squirrel
author_rank: Super Contributor
timestamp: June 11, 2017, 01:50:47 am
content: I remember the stock cooler on my AMD 2000+, that fan sounded like a vacuum cleaner lol.

author: mariush
author_rank: Super Contributor
timestamp: June 11, 2017, 02:28:12 am
content: The 40mm fans go up to 25000 rpm .. for example Sanyo Denki America Inc. 9GAX0412P3S001 for 20$ :https://www.digikey.com/product-detail/en/sanyo-denki-america-inc/9GAX0412P3S001/1688-1614-ND/6192330Just commented on the forum on linustechtips a few minutes ago ... he got screwed paying 55$ for a fan.Digikey has better fans:You can buy 80mm fans, Delta PFM0812HE for 31$ : 16300 rpm , 130 CFM (3.67cm3 / min) , 77dB noise ... 51.6w on 12v (4.3A) :https://www.digikey.com/product-detail/en/delta-electronics/PFM0812HE-01BFY/603-2045-ND/6580735Or in the 92mm format, you have Sunon Fans PF92381BX for 25$ : 13000 rpm , 182 CFM (5.16m3/min) , 74 dB noise 48 watts on 12v :https://www.digikey.com/product-detail/en/sunon-fans/PF92381BX-000U-S99/259-1672-ND/4865303

author: Halcyon
author_rank: Unknown
timestamp: June 11, 2017, 04:42:29 am
content: Is there anyone else who can't stand that guy's "enthusiasm" and voice? I just can't watch his videos but mainly because it seems he doesn't really have that much of an in-depth technical knowledge when it comes to PCs and components. He seems to promote whatever parts companies throw at him.

author: Halcyon
author_rank: Unknown
timestamp: June 11, 2017, 04:56:00 am
content: Quote from: blueskull on June 11, 2017, 04:54:05 amGood point. Although I think Dave is a pretty good presenter. I guess his accent and inflections sound normal to me. He is certainly very passionate at times, especially when debunking bullshit.

author: Bud
author_rank: Super Contributor
timestamp: June 11, 2017, 05:03:25 am
content: I could barely handle 2 minutes of the video....Why so much drama? Who is the audience for this channel? Teen girls?

author: Bud
author_rank: Super Contributor
timestamp: June 11, 2017, 05:46:10 am
content: Quote from: blueskull on June 11, 2017, 05:09:40 amI see your point, but in reality all that he achieved was he totally lost me as a viewer. And I do not think I am that unique so chances are there is a substantial chunk of the audience that he lost with his clown manner of presenting otherwise fairly interesting material. At minimum I'd recommend taking lessons from a dramatic arts professional if he wants to do it this way. It just all feels false.QuoteI keep hearing this on this forum every now and then about content providers and each time my opinion is :- then that person is in the wrong business.

author: TiN
author_rank: Super Contributor
timestamp: June 11, 2017, 06:36:37 am
content: Meh. I have few of these (120x38mm). They also have slow-start feature, so first they start at innocent low speed and in about 30 seconds ramp up to full might.Was 20$ or so from local fan shop. Speed of this one is about 9000RPM (not to forget it's a 120x38mm fan.The highest power fan in 120mm format I saw was Sunon 8.5Amp +12V at demo booth few years ago.Server/HPC folks surely have these as random fans in drawers.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: June 11, 2017, 11:37:04 am
content: My most powerful fan is the PFC1212DE.Rated 4.8A peak.You can buy one cheaply here:http://www.ebay.com/itm/Delta-PFC1212DE-PWM-120x38mm-Extreme-High-Speed-PWM-Fan-225CFM-M4194-QL-/182431202121?hash=item2a79bf3b49:g:SSAAAOSwcBhWZRx4*The current rating on the fan usually means the peak current, the RMS current will be much, much lower.

author: Kjelt
author_rank: Super Contributor
timestamp: June 11, 2017, 11:41:38 am
content: Just build a state of the art computer with 7700K and Nvidia1080ti total 500W, but I only use 140mm low RPM fans (6 in total).The only thing I can hear is my network switch that has 40mm fans inside (replaced them with Noctua to drop 20dB in noise already),so it is not about the power unless you have a seperate server room, it is about air movement and silence in most cases

author: Red Squirrel
author_rank: Super Contributor
timestamp: June 11, 2017, 11:52:47 am
content: I'd imagine you'd normally set these fans up in a setup where they run at low speed and rev up based on temp. Gives you that extra rippums for if there is temp issues in the room. (ex: server room and A/C fails)Some of these with 100CFM+ are pretty impressive though. That's comparable to larger HVAC fans/blowers that are meant for moving air through duct work. I guess the hvac ones will have much higher static pressure though.

author: daqq
author_rank: Super Contributor
timestamp: June 11, 2017, 12:12:02 pm
content: Funny, we recently bought a 50 EUR, 48VDC fan from EBM PLAST. It was the first time I've played with a fan of this class and it was also the first time I was actually scared of a fan, since the damn thing sounded like it wanted to take off and I've grown fond of my fingers.

author: jonovid
author_rank: Super Contributor
timestamp: June 11, 2017, 12:19:42 pm
content: Quote from: daqq on June 11, 2017, 12:12:02 pm4 of them may just levitate everything off the desk

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: June 11, 2017, 01:59:04 pm
content: https://hobbyking.com/en_us/dr-mad-thrust-90mm-12-blade-alloy-edf-1400kv-2500w-6s.html

author: Bendba
author_rank: Regular Contributor
timestamp: June 11, 2017, 02:54:18 pm
content: Down town wrecker sells 600mm diameter fans, about $15, just plan on have a separate power supply for the continuous 10A (probably about 25A peek).Holden fans are pretty quite.Edit: sorry, out of line. I just never really got that thing about computer fans. Well designed clean fins and ample available fresh air are more important than the fan blowing

author: wraper
author_rank: Unknown
timestamp: June 11, 2017, 03:03:03 pm
content: Quote from: NiHaoMike on June 11, 2017, 01:21:39 amYou won't ever find any of such fans in PCs, only servers, some high power UPS. They're so loud, it's very annoying to be any close.

author: CopperCone
author_rank: Super Contributor
timestamp: June 11, 2017, 03:46:52 pm
content: Quote from: Bud on June 11, 2017, 05:03:25 amgod forbid someone has some fun

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 11, 2017, 05:15:22 pm
content: Quote from: wraper on June 11, 2017, 03:03:03 pmIt helps that such high powered fans are generally variable speed so they don't actually run at top speed very often. They're very quiet at their "idle" speed of around 1200RPM. Actually quieter than a cheap fan at the same speed since they're sine wave drive.

author: Howardlong
author_rank: Super Contributor
timestamp: June 11, 2017, 05:56:42 pm
content: Quote from: Halcyon on June 11, 2017, 04:42:29 amWhile I certainly agree with all that you say, he seems to make a reasonable living out of it. I doubt it's Youtube money that keeps him afloat, it's the embedded ads, merch and infomercials he does. Most of his content is the blood sweat and tears of the dozen or so others working for him, he's just the main voice. I don't like the way he seems to treat his coworkers sometimes which inadvertently comes across occasionally during his livestreams.I much prefer his coworker Luke Lafreniere as a presenter, not an ounce of arrogance in him.Like him or not, he must be doing something right.

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: June 11, 2017, 07:13:50 pm
content: Back in the 180/130nm CPU days, 40mm Delta fans were pretty common. My PC was hated in my household, even when running the fans at 7V they were obnoxious.Bud, I get you re Linus. I found that Luke's videos have some respite to Linus's high pitch voice. Thinking about it, it's not much different whine in his voice isn't too dissimilar to the whine of that Delta fan

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 11, 2017, 08:33:56 pm
content: Quote from: RGB255_0_0 on June 11, 2017, 07:13:50 pmI haven't seen very many 40mm fans, let alone high power Deltas, in anything other than 1U servers and similar slim equipment. I actually did build a super slim PC that had two of them, but thanks to modern CPUs being very low power at idle, it wasn't noisy at all in typical desktop use. (Load up the CPU to max and it starts sounding like a hair dryer, but even games generally don't do that very much.)

author: Howardlong
author_rank: Super Contributor
timestamp: June 11, 2017, 09:04:19 pm
content: I may be a lone voice hear, but I like the audible feedback I get from the fans when working, it's feedback that it's doing something. Weird, I know.

author: daveyk
author_rank: Frequent Contributor
timestamp: June 11, 2017, 10:04:50 pm
content: Quote from: blueskull on June 11, 2017, 02:17:39 amWe have used some 1u computers that sound like a 747 taking off.Sent from my iPhone using Tapatalk

author: buck converter
author_rank: Regular Contributor
timestamp: June 11, 2017, 10:17:58 pm
content: Quote from: blueskull on June 10, 2017, 11:33:01 pmThere exists a table saw with a "flesh detection" system that brakes the blade if you poke it.

author: wraper
author_rank: Unknown
timestamp: June 11, 2017, 11:37:13 pm
content: Quote from: NiHaoMike on June 11, 2017, 05:15:22 pmThey're not quiet at idle speeds, very unlikely someone would run them at 1200 RPM. Of course they are not like jet engine at low speeds, but still much louder than any normal person would find comfortable. I have a few server PSUs with similar fans. As well we moved to different room 2 of Eaton UPSes at my workplace twice (had similar fans from Sanyo) because people found them unbearable, and they were not running nearly at their full speeds.

author: daveyk
author_rank: Frequent Contributor
timestamp: June 11, 2017, 11:40:13 pm
content: Quote from: blueskull on June 11, 2017, 10:09:10 pm

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 12, 2017, 04:42:35 am
content: Quote from: wraper on June 11, 2017, 11:37:13 pmIt depends on the design of the fan. Some have director vanes to increase static pressure that can act like a whistle. The ones without director vanes are indeed pretty quiet at idle.Quote from: blueskull on June 11, 2017, 10:09:10 pmSo do the ladies (and even some cats). Micah Elizabeth Scott has a full 19" rack right in the middle of her lab/recording studio. Granted, there aren't any off the shelf servers in the rack, just a UPS and a few custom built rack PCs. (The newer 2U and larger servers, if not loaded too heavily, could indeed be quiet enough, but it's a lot cheaper to build your own if you don't actually need many of the features like hot swap and tech support.)

author: Unknown
author_rank: Unknown
timestamp: June 12, 2017, 05:13:32 am
content: Quote from: blueskull on June 11, 2017, 10:09:10 pmI built my workstation into a 4U rack case so it could sit in the 52U four post rack with the rest of my equipment (networking lab, old HP PA-RISC, DEC Alpha, SGI machines for fun). But that lives downstairs in the utility room.The monitors are brought up on displayport, USB repeaters bring up keyboard/mouse, and audio comes up on optical S/PDIF, all through a 2" conduit to the 2nd floor office. So the workstation can be as loud as it wants but it is completely quiet up here.