Electronics Cpemma

Is what i read in a different forum correct, that you can make a strobe LED for a fan by simply hooking a LED between the RPM lead and ground.

I.E, FAN RPM LED----------Resistor---LED----------Ground

 

On most fans the speed line goes low (0v) twice per rev IIRC, so you may need to hook the led/resistor to +V rather than ground. Or maybe the other poster has used the pull-up resistor as his led resistor and got enough current to light a led hooked to ground?

Never tried it, why not blaze the trail?

Looking at Nidec, the maximum I_c is on the low side for leds so be careful.

 

where is the LED on that circuit mate

 

Its Nidec's circuit. Where's this other post?

 

its here, HDD win

its just mentions it and so I wondered if it could be done, where is the link for that circuit mate

 

http://www.nidec.com/motorscircuits.html

Looks like we'll have to wait till Darkness falls for the full story.

 

cheers cpemma, is there a circuit diagram of doing this strobe light mod on here. I dont understand that circuit diagram linnk Im thick