robertjpjr t1_ja3dilz wrote on February 26, 2023 at 3:30 PM

Buy a cheap PC PSU. Jump the green wire to black so it turns on. Connect your fans to the power supply. If your fans use molex, that's easy. If your fans use a 3,4 pin connector you can buy adapters and or a hub type splitter.

zipykido t1_ja4dtz3 wrote on February 26, 2023 at 7:29 PM

Yeah this is the easiest solution that wouldn't require any engineering.

paulmarchant t1_ja4s0iz wrote on February 26, 2023 at 9:04 PM

Nah... I present the even lazier way:

https://www.amazon.com/s?k=pc+fan+power+supply&sprefix=pc+fan+power+%2Caps%2C162&ref=nb_sb_ss_ts-doa-p_1_13

robertjpjr t1_ja6d282 wrote on February 27, 2023 at 4:14 AM

Didn't know those existed, cool!

kyrsjo t1_ja58o5w wrote on February 26, 2023 at 10:59 PM

Eh, a wall wart is cheaper smaller and less noisy.

Senior_Cheesecake155 t1_ja6cjpp wrote on February 27, 2023 at 4:09 AM

I’m in the process of doing that to power an old car stereo and amp in my garage. It’s totally pointless, but fun regardless.

robertjpjr t1_ja6d12o wrote on February 27, 2023 at 4:14 AM

Ya I've done that too. Wired up 4 old truck speakers to a homemade enclosure. I got about 50 old PC PSUs for $50 once. Made a bunch of benchtop power supplies for me and my buddies. You can get 12v 5v and 3v or hook up a buck controller and get variable voltage.

Senior_Cheesecake155 t1_ja7da72 wrote on February 27, 2023 at 11:44 AM

Yeah. This started when I stripped down an old Dell desktop that I kept moving around my garage while waiting for an e-cycling day. I’m still trying to decide what to do with the fan (possibly cooking for the enclosure everything is going in).