Running a brushless PC Fan

Discussion in 'The Projects Forum' started by amansammy, Apr 5, 2013.

  1. amansammy

    Thread Starter New Member

    Nov 21, 2012
    Hello everyone,
    I am at this moment making a bench power supply and wanted to install a fan in it to remove the excess heat from the circuit. Got to the PC repair shop to get a PC fan for this task and found out that it had three wires.
    One is black, and I guess it is ground.
    One is Yellow.
    and one is green.

    I'm sure this requires a circuit to run the fan at full power with a 12v battery.
    Can you help me with one. Tried googling something but found nothing.

    Aman Sammy
  2. tubeguy

    Well-Known Member

    Nov 3, 2012
    Look a this:
  3. Tealc


    Jun 30, 2011
    Yellow 12v
    Black Ground
    Green Tach

    Just wire the yellow to a 5-12v source and connect the black to ground and it'll work. You don't need to connect the tach to anything but it sends a pulse twice per revolution so you could create a frequency counter for it if you wish.