just wanna ask... if i use a 12v fan and plug it in to the laptop's usb port, will it cause any problem (ignoring the 3rd wire-yellow)? if possible, then can i wire two 12v fans together and use the same usb port?

i know the recommended one would be powering the fans directly via power adapter rather than usb. can someone explain how to do it with a speed controller and the whole wiring thing?

i'm really into making one for myself. i've seen that most of you guys used 12v fans and hook it up with a power adapter. can someone show how make the connection?