I just got my new Raspberry Pi 3 B+ and I'm really happy with it however... I want to make a modded case to serve two basic purposes: Air intake AND looks for my desk.
For that I need to use an external 120mm fan + an on/off LED switch. The switch I chose is a typical momentary reset 5v button, but the fan is 12v/0,35A/4.2W so the idea is to connect a step-up module from the 5V of the Raspberry to reach the 12V (or less to make it run slower) of the fan.
Can it be done or I will fry the raspberry, the desk, the neighborhood and my whole dignity?