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PWM 3-pin

post #1 of 9
Thread Starter 
I am currently building a 4-pin custom PWM fan controller that plugs into USB and runs off molex. I have heard that some 3-pin fans acctually work off 3-pin if you PWM the power pin. I am thinking of getting 2xCooler Master Megaflow 200 Red and either getting some more 120mm 4-pin PWM's or using the stock HAF 912 fans (im getting a HAF 912). The advantage to this is these fans are quiet for the CFM and slightly cheaper than 2 120's.
Would this work for the Cooler Master Megaflow 200 Red's ???
Edited by Rx14 - 12/11/12 at 10:19am
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post #2 of 9
Will not work.
No way.
No how.

Power lead is 12v

PWM lead is a trigger signal to built in circuit board in fan to trigger pulse of 12v power to fan.
post #3 of 9
Thread Starter 
Quote:
Originally Posted by doyll View Post

Will not work.
No way.
No how.
Power lead is 12v
PWM lead is a trigger signal to built in circuit board in fan to trigger pulse of 12v power to fan.
Thats kinda what i meant. Just PWM the 12v pin with an external transistor instead of a chip IN the fan. Instead of the fan pulsing the power supply using the PWM pin why not just use an external transistor that pulses the 12v on a 3-pin based on the PWM pin of a 4-pin. I was just wondering if you needed special motors to handle PWM power...
Sorry for the late post, i was away from my computer.
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post #4 of 9
So you want to make a pwm to voltage fan converter.

Phanteks supplies one for their fans in their cooler kits

Simple one here.
http://forums.overclockers.co.uk/showthread.php?p=22644791
Tealc's is a very good unit and he will make and sell you one. Worked with him some when he as designing and prototyping his Very nice little units. He can make them for as many fans and for whatever combinations you want. Even made some for GPU cooling. smile.gif.
post #5 of 9
Thread Starter 
As i am good with soldering all you really have to do is put a transistor on the 12v controller bu the PWM so we will do it ourself because we are making a custom fan controller too so...
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post #6 of 9
Quote:
Originally Posted by Rx14 View Post

As i am good with soldering all you really have to do is put a transistor on the 12v controller bu the PWM so we will do it ourself because we are making a custom fan controller too so...

It's not that simple but good luck. thumb.gif
post #7 of 9

Actually, it's not always a good idea. There are some professionally made (and sold) fan controllers that pulse the 12v line, like a PWM. I once bought a PWM kit and discovered it was not a 4-wire but 3-wire kit, so I didn't build it.

 

The reason it's not always a good idea is that a number of fans sound really lousy when their 12v lines are pulsed. This is one reason I never test fans with fan controllers, but use pure 12v or 5v current from the PSU.

 

Someone used to make a PWM-to-nonPWM fan controller, but I'm not sure if it converted the control to lowered Voltage or merely pulsed the line.

 

In general I'd recommend that if you get a 200mm fan, get one you can stand to listen to 24/7. If you get 140mm fans and want PWM control, look at the TY-14x line of PWM fans from Thermalright. If you want 120mm fans just get PWM fans -- there are plenty of them out there. And if you want to convert highspeed Gentle Typhoons to PWM, see my sig.

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post #8 of 9
Agree with ehume.

If you want PWM buy PWM fans.

The TY-14x series fans are very good and very reasonably priced.
Once site I use has pre-order TY-147 = £5.99. Normal price on TY-141 = £6.31-11.99 and TY-143 = £12.99.
Another has TY-140 = £9.44
post #9 of 9
Thread Starter 
Yeah, you dont really need to Pwm 200mm's and I can always get those low noise adaptors...
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