Great variable speed controller for electronic projects!

30W DC Motor Speed  Controller (PWM)  {3 PACK}  by FICBOX

***TO BUY:  Via my affiliate link: https://amzn.to/37g40Vz
OR
https://www.amazon.com/dp/B07PDL7H76

I am trying to make an exhaust system for my 3D printer/laser engraver.  These motor controllers will work perfectly for my application.  I will be hooking them up to a computer fan to regulate the amount of airflow. I really like the fact that the switch can be turned completely on/off and has that "click" sound so you know the device has been turned on/off.  There is also an LED mounted to the PCB that shows if the device is on or off.  

With my initial testing with a 12volt power supply, I don't see/hear sequential increases in speed, but instead, it is a smooth transition.  At full power, my computer fan runs well below the 2amp max rating for this controller.  The PCB is clearly labeled with the power input showing the polarity on the PCB as well as the motor connections.  This, along with the screw terminals makes wiring quick, easy, clear, and solderless.  Also, the small form factor is nice because I want my project to be as compact as possible!

***Thank you to FICBOX and LIJUAN for providing me a discount on this product and the opportunity to give my honest opinion.  Also, thank you for your patience with the time it took me to produce this comprehensive review.
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