I've salvaged a Nidec G14T12BS2AF-56J14 fan from a broken Playstation 3 which I would like to use to make a dust blower for PCs.
As a test, I've connected the fan as follows:
- Brown: 12VDC
- Black: ground
- Grey: 12VDC
When connected like that, the fan spins at maximum speed (which is my desired result).
However, I'm not sure this is the correct way to connect this fan. First I suspected the grey wire to be a speed sensor, but the fan didn't spin when it wasn't connected. After touching the wire to 12VDC, it started to spin full throttle. I've found out that the grey wire is a PWM wire via http://eikimartinson.com/archives/104-Driving-a-Playstation-3-Fan.html, where it states the PWM should be a 25kHz signal. But I've also read comments from people who stated using 5VDC or 3.3VDC directly connected to the grey wire.
Can I connect the grey wire directly to 12VDC? Should I add a resistor (1k for example)? Should I use a voltage divider to get 5VDC or 3.3VDC? Or do I really need a PWM signal? Keep in mind that I do not want to control the fan's speed (it would be a bonus, but the fan should really be running full throttle when in use).
Thanks for the information!