PC fans and LED

Discuss PC fans and LED in the UK Electrical Forum area at ElectriciansForums.net

G

gmant

I have a load of PC fans, some 2 wire(red & black), some 3 wire(red & black & white/blue/yellow). I am testing these out by connecting an LED to the red and black wires then spinning the fan. All the 2 wire fans are lighting the LED but all the 3 wire fans are not. On the 3 wire fans I am not connecting the 3rd wire to anything, could someone tell me why the 3 wire fans are not working and what I need to do to get them to light the LED?
 

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