Looking for the simplest way to use a portable 5 volt USB power pack with a PC case fan. I already have a 90mm PWM Noctua (NF-A9 PWM) that’s be nice to use, but can swap out if necessary. Use case is for a filtered forced air feed for a face mask. Ideally I’d like some control over fan speed (off, low, high is fine).
Simple is best! Unless it is an OTS sub $5 part that is all inclusive, I don’t want to start soldering up resistors, capacitors, etc.
Doable, or pipe dream?