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.

Regards
Aman Sammy

 

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.

Regards
Aman Sammy

Look a this:
http://www.pcbheaven.com/wikipages/How_PC_Fans_Work/

 

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.