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3 wires on PC fan

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Masterfree Posted messages 212 Status Membre -  
Masterfree Posted messages 212 Status Membre -
Hello everyone

I modified a PC power supply and since I added 2 resistors, I would like to add another fan.

There are 3 wires (RNJ).
I connected the N and the J, but it's not spinning.
However, with the R, it reacts but it doesn't spin either.

Could you tell me how to fix this?

Thank you in advance for your responses.

Configuration: Windows 8
4Mo RAM

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Best regards.
Masterfree

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Réponse 1 / 4
vieu bison boiteu Posted messages 44334 Registration date   Status Contributeur Last intervention   Ambassadeur 3 591
 
a 10-watt resistor does not have the same casing for cooling
the images I uploaded are for 2 watts and less

https://www.google.fr/search?q=r%C3%A9sistance+50+watts&biw=1171&bih=789&source=lnms&tbm=isch&sa=X&ei=DYdKVIDkA8LiaILjgOAM&ved=0CAYQ_AUoAQ

you still need to know the resistance value
if it's 500 ohms, you have 24 mA at the fan

also, if it's a PWM, it operates by pulses of +12 volts peak
square wave type signal = https://www.electronique-radioamateur.fr/elec/base/img/square.JPG
no links on web pages in English, I'm already flying solo enough
3
Masterfree Posted messages 212 Status Membre 4
 
Hello,

Thank you old bison, but I'm not very skilled in electronics or small electricity; my field is more about mechanics.
Here, I just follow the assembly according to the tutorials I've consulted, so for me, 10W or 2W, I don't really see much of a difference in action.

Since I'm retired now and had the power supply in stock, instead of putting it aside and having all the time, I wanted to modify it a little.
At first, I planned to do it to power a CD car radio, then I thought, why limit myself to just 12V.

Oh, I should mention that I'm "color blind," so it's quite difficult for me to read the power of small resistors with the color code!
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