thermaltake contac16 ...a way to minimize the fan from running full speed all the time

[Rekemrekem]

hi, i recently buy a thermaltake contac 16. it works good but the fan is at full speed all the time... im planning to drop the current that reaches the fan. ill add a diode (in4007) in series of the +vcc from the motherboard. forward flow to the fan but with a resistance, the current that reaches the fan will drop and so thus the speed will drop noticeably.

im hoping there are computer-electronics techs here that can access me in this. i have done it in some projects it reduces speed of fan but have not try this with a motherboard

https://www.facebook.com/photo.php?fbid=735042059910497&l=30511c230e

double the diode in series further reduce fan speed. i have tested it on some projects and it doesnt heat up. if it does buy a diode with bigger ampere rating.... but my problem is i have not tried this on a motherboard (cpu fan).

 

[C12Friedman]

While you probably can do that without damaging the motherboard I would highly suggest replacing the stock fan with a PWM controlled 92mm fan like this http://www.newegg.com/Product/Product.aspx?Item=N82E16835186034 which will let you control fan speed from the motherboard

 

[Rekemrekem]

id love to. but not available in our local stores. i cant purchase online. too costly. currency change and so on....

so you mean that diode can be an alternative?

 

[C12Friedman]

I remembered I have a few fan voltage reducers so I figured I'd bare one to see it's setup. A simple in-line resistor (appears to be 1/2W 51Ω on my 12v-7v reducer) like this

image (and corresponding thread) found here http://www.overclock.net/t/1427454/the-weird-4pin-adapter-that-comes-with-bitfenix-fans-is-it-safe I'll suggest reading it

 

[Rekemrekem]

its not about voltage... its the current flow that will be reduced thus reducing fan rpm. 51 ohm seem to big. but ill try different values, 20 ohm up to 51 ohm. [[ but the pic above is 47 ohm ]]



[black ground, red v+, yellow rpm sensor, green speed controller] 4 pin fan.
on a 3 pin, the speed controller is omitted, thus it is always running at full speed.