Possible to run random cheap fans slowly enough to be quiet?

Our "pub" where you can post about things completely Off Topic or about non-silent PC issues.

Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee

Post Reply
Posts: 1
Joined: Wed Jul 12, 2017 12:33 pm

Possible to run random cheap fans slowly enough to be quiet?

Post by THX1138 » Wed Jul 12, 2017 12:46 pm

I'm making a couple of spotlights for video recording (just a hobby) using CCFLs out of a lot of broken monitors that I got for free. My problem is that I will have so many in such a small space that I think forced convection will be necessary. I was wondering whether I could use cheap fans salvaged from dead PCs at the same place I got the monitors (a community repair workshop) and run them slow enough that they won't affect the video recording. I read somewhere that the slowest I can run a 12 V fan without stalling it is 3 V (and it might need as much as 6 V for start up). Is 3 V low enough to make a crap fan quiet? Can many run lower than 3 V? Thanks.

I made this video to show how I think the fans could work (and also my original idea which I thought could be passively cooled but without a way to easily fix the CCFL tube to the plate (because of the bulky insulation at each end), I think it won't work).


*Lifetime Patron*
Posts: 1816
Joined: Thu Feb 13, 2003 6:53 am
Location: Sweden

Re: Possible to run random cheap fans slowly enough to be qu

Post by Vicotnik » Thu Jul 13, 2017 7:02 am

Yes, cheap fans will most likely do fine. If you will use several fans, it would be good if they were the same model. That way, if you want to control them they would act the same. You could build a simple rheobus fan controller and then tune them as you see fit. Or give them a fixed voltage for simplicity if you have a power supply that will do the job.
Main: ASRock B85M-ITX | i3-4330 | 16GB DDR3 | Intel 730 240GB | HDPLEX H1-S | picoPSU | No moving parts | Idle 13.9W
HTPC: ASRock H81M-ITX | Pentium G3420 | 4GB DDR3 | Intel 535 120GB | HDPLEX H1-S | picoPSU | No moving parts | Idle 11.2W
Gaming: Intel DH77EB | i5-3570K | GTX 1060 6GB | 16GB DDR3 | TJ08-E | RM750X
Server: ASRock N3150-ITX | ~30TB | G-360 | Idle ~25W

Post Reply