I have a number of very small 40mm cooling fans which I want to run inside of a device I can move around my home. (Its for a crafting project.) Ideally, I'd be able to plug the fan into a standard USB charger or the USB outlet that I have on some of my household electrical outlets. (USA)
Even if I had to do a little bit of soldering, what is a somewhat convenient and inexpensive way to step USB charging outlets up to 24V (without providing too much amperage) or stepping 120V (USA) down to 24V (again with the right amperage.)
Thank you all!