12V 24V 36V 48V 40A(max) PWM DC Motor Speed Controller CCM9NW HHO Adjustable Variable Speed Switch with Wire Harness

The one I received has FOUR FET's instead of the SIX shown in the photo and the FOUR heat sinks are pretty massive ... GOOD !!! The PCB also has a double position, 2-pole switch ... also not shown in the product photo ... Upgrade, frequency control ??? At any rate, PWM is a simple 555 timer circuit with what looks like THREE parallel SMD chip caps between pin 6 and ground that set the frequency. Reduce the value of these caps ( by replacing them ) to raise the frequency. I have ordered several more of these and I will post photos of the circuit and the Fix when I review the new shipment.

Ordered 4 of these for a project. Good thing I did, because the first one only runs at full speed, there is no control at all, it is either on or off. Number two, does not run the motor at all. The voltage vanishes on the outputs as soon as the motor is connected. Number 3 works as it should. The motor hums VERY loud, but it works. I did not try number 4, I am returning these now because I have no faith in this product. With a 50% failure rate, how can I trust the product?

Like another review this does nothing but run the motor full speed. Even when the switch is turned to OFF. I had to cut out a section of the box to make room for the bigger wires I had. A 40A product should have space for bigger wires. Since I cut out a piece of the box and it has been run, I don't know if I can exchange it. I'll try and see what happens.

It's noisier than I expected. I'm controlling a small array of computer fans and the PWM switching generates a hum that is as loud as the fans. My fault though, I over-bought a high wattage PWM because my other option wouldn't ship for several weeks.

After about 6 total hours of use as an HHO driver at 12 vdc, <25 A one of the electrolytic capacitors exploded & the other was near to exploding. Upon inspection of the PC board I discovered the solder quality of the components was very poor. Both caps & several other components had almost no solder on the pins. Don't waste your time or money with this product. It is poorly manufactured & obviously NO quality control.

Save your money, this unit did not work out of the bag! It is very simple to hook up so it is not a wiring error on my end. If you purchase this you will have a cool looking knob to turn that does absolutely nothing.It will shut off, but there is no difference in the results of turning the knob from low to high.

As a really expensive toggle switch it works great. As a motor speed controller it doesn't work at all. I connected this one to 3 different 12V motors, each woked the same. Turn it on and it goes full power, turn the knob up same speed, turn the knob down, same speed. No speed contol at all. Bought a different one that works great.

Dead on arrival. No PWM occurred with any dip switch setting. The potentiometer had zero effect on all DC motors or LED lights I tested. I confirmed tests using another working PWM motor controller.