Speed controlling computer fans
For years I have been using the Silverstone fm121 as it comes with a remote mounted speed controlling potentiometer, goes as high as 110 CFM and 0.4 amps consumption. It is fairly quiet for this am...
Forum Discussion
IMHO-- you don't need those extra wires in RV service unless you really wanna get anal with control systems, although that might be fun. One is an output tach, and the other is the PWM Control input from the control board that you don't have.
You can do it two ways: Use something like THIS with all the 12v drivers stripped out and grab the PWM pulse direct to feed the fan, or do what I did and feed the PWM controlled voltage direct to the fan input and snip the other two wires. That's what I did and it works fine. I'm running 4ea. 2000 PPC from one of these eBay boxes to turn them around 40% and they start just fine. Running these on high I really worry about possible causing a flameout, and I think it's already happened. If I were to do it again I might grab the 3v waveform and play with it a tad. If you haven't bought them yet, take a look and see if they make a 120mm FLX version. That's the one I have in an 80mm version in the fridge box.
The next step is to install the ARP and drive the Noctua's from the ext. fan control
You can do it two ways: Use something like THIS with all the 12v drivers stripped out and grab the PWM pulse direct to feed the fan, or do what I did and feed the PWM controlled voltage direct to the fan input and snip the other two wires. That's what I did and it works fine. I'm running 4ea. 2000 PPC from one of these eBay boxes to turn them around 40% and they start just fine. Running these on high I really worry about possible causing a flameout, and I think it's already happened. If I were to do it again I might grab the 3v waveform and play with it a tad. If you haven't bought them yet, take a look and see if they make a 120mm FLX version. That's the one I have in an 80mm version in the fridge box.
The next step is to install the ARP and drive the Noctua's from the ext. fan control
