Abovehill PWM Fan Speed Controller,Adjustable Fan Temperature Control Module 2A with Temperature Sensor for 12V/24V DC Fan

I ordered one of these to put into my 3d printer, hoping that it was not a hacked together circuit. It's not! This is the real thing. It is based around a Microchip fan controller IC made for this job. The build quality is excellent, the design is robust and has some safety features built in. Based on the ratings of the parts, it would probably survive inputs up to 35V, although I wouldn't recommend it. For the tinkerers, there are some pads on the PCB to change the default operation from auto-shutoff below a certain temperature to having the fan run all the time at a minimum speed, increasing as temperature increases. My only gripe is that I wish there had been some documentation. I had to generate my own. Well worth the money!

I needed to install a ventilation system for some electronics I installed in a cabinet. After all the hurdles of installing fans and vent ducts I was elated that this was simple to connect and did exactly what I wanted it to do.

I'm using this to ventilate a locker in my camper that houses a 2500 watt inverter and a 40 amp solar charge controller. It was easy to install and works great!

This board is TC648 based, switching a low side power switch at 30Hz±5Hz. A 4pin fan has a tach output and a TTL PWM input. And the TTL input on the fan is 25kHz±5kHz, not 30Hz±5Hz, so the output power switch cannot be bypassed and used directly.If you plan to control fan speed by PWMing the power rail, this will work. PWMing the power rail will work with *some* 2 and 3 pin fans, but not 4 pin fans.

I'm using this to ventilate as temperature rises. Works great!