120mm Fan Testing on an MCR120 Radiator Round 6

[bing]

Seems like 4pin PWM is the only real good PWM setup, but even that is a bit "Fan Specific". Some of my 4 pin PWM fans have a large range of control, nearly 0-100%, while most seem to only turn down a little bit...and some make some noise, while others seems to be pretty good.

I plan to do some 4pin PWM testing after I get my last order in using my 4 pin PWM controller Bing designed.

Martin, fyi, at that diy controller of yours, with just an additional of 3 poles switch and a resistor, it will cover full range with 3 zones at 0% , 2-98% and 100% like this here :

That resistor values is not critical, as long above 100 Ohm, just look at your components bin, any resistor that has a resistance in hundreds of ohm should be fine, heck, even 1K should be ok too.

PWM controller mod.png

Of course this minor mod will not have as the other circuit that has a clean and smooth range from 0 to 100%, but think this should be enough to serve your purpose.