ZK-BMG DC Motor Speed Controller, 9V-60V/12A/500W DC Encoder PWM Control Adjustable Speed Variable Rotary Switch PWM Signal Generator Module

Very nice small digital speed control. Works very well.

Great speed controller. I use it to run a water pump over about a year. Dropped it into water several times - still working great. The only visible effect after going underwater are the rusty screws of the connector.

Arrived on time, works well.

I bought 2 of these to control 2 radiator fans that I used to build a cooling system in my SxS. Everything works very good and being able to control the fan speed is awesome. You need to know how to wire electrical components and build them to withstand the conditions they’ll be used in. In the least, understand instructions so you can effectively build your electrical system.

I already reviewed this but here it is again. My use case was to provide variable speed control to a 12v Kamado Joe smoker air blower fan motor. I selected this PWM unit because the exterior design would look almost "factory" on my blower motor housing. The terminal block is well labeled and robust. The dial is a digitizer which makes it a lot more flexible. When I first tested this set up, the controller was not linear, meaning the fan didn't turn on until the dial was set above 20% power. After that, the motor speed ramped up to 100% at a setting of 50% on the digitizer. That would have worked but i wanted a very fine linear control as air flow on a KJ is critical to stable temps. I corrected this by inserting a 4.7 ohm 25-watt resistor on the + fan lead. It now works perfectly. The motor starts at 1% and ramps up to full speed at 100% dialed power setting. My motor only draws 1.5 amps so the 12A capacity of this unit indicates major over engineering so it should last a long time.