DC 12V PWM PC CPU Fan Temperature Control Speed Controller CPU Alarm Module

Easy to install and program

This board is controlled by a Nuvoton MS51FB9AE on my ZFC39 V2.0 board that I received a year ago. I'm putting it inside a solid state linear shortwave amplifier, and I need any RF noise from this board to be addressed so it doesn't affect the amp or reception. After some work, it's working great and keeps my fans silent at the 20% duty (3x Noctua NF-P14s redux 1500rpm) when the amp is not working hard.As-is, the controller creates radio interference noise in the medium- and shortwave ranges, due to the 25 kHz PWM that is applied at all times except when the fans are driven to 100% duty. I've tested with a good clean bench power supply, confirming the RFI comes from the board and emanates from the fans as well. The noise is sufficiently abated by shielding the controller, a dedicated AC/DC transformer for it, and its fan cables up to the point where they exit the amp, with perforated metal mesh conductive tape and grounding the tape to the amp case.In my setup, the "SY" pads are soldered together, which causes all three fan outputs to be controlled identically by the single temperature reading for FAN1, and the two potentiometers for setting fixed FAN2 and FAN3 speeds are ignored.

As other reviewers mentioned, there is no real manual and Youtube is your friend! Fortunately someone did a great video about it (title: ZFC39 PWM Fan controller).Key point is that any dip-switch settings only take effect after powered off and on again.It supports three fans, but only the first one is temperature controlled. The other two are via the potentiometers. You can only specify some temperature levels, but not the hysteresis.Wish it only supported one fan, but gave you more options on base speed (my fan didn't even spin at the possible base speed settings), start and max. temperature.

It worked great. My wife made a home made box fan to help her stay cool on those hot days.