How to power coolers from PSU?

Question

Electronics

Comrades, I do not rummage in electronics, I need help.
There are 3-4 Zalman coolers. I made a box, hung coolers on it, it is necessary that they work from which PSU thread or maybe from USB (although it’s unlikely, the voltage is not the same). Ideally, you can somehow connect a relay to control the speed. But I don’t rummage about this, so I would be grateful for a working connection diagram, and if there are still links to aliexpress, which relays / PSUs and other circuits to order, I will be grateful.

Answer 1

Sergey Ryzhkin ,

It won't be on PC.

Then you need to proceed from what kind of food will be in this box. It makes no sense to drag a separate PSU if the box has some kind of electronics with its own power supply.
But you can choose from universal power adapters. Switching the voltage on the adapter will control the speed of the fans. And you don't need to do anything extra to adjust. Computer fans usually start at a minimum speed of about half the rated voltage (about 6 volts), many are not able to spin up from 5 volts. So it makes sense to regulate in the range from 6 to 12 volts. Your choice (you can find similar ones in other stores):
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Answer 2

coolers are usually powered by mollex, i.e. 12v, so sculpt with any free molex and they will work, you can play with speed through a dimer from an LED.

Answer 3

Through a device like this: https://www.aliexpress.com/item/32917157039.html
Or this: https://www.aliexpress.com/item/32998939126.html
There are many of them for every taste and a different number of channels.