2Pcs 5A Motor Speed Controller Module Mini DC Motor PWM Speed Controller Switch Control Controller Switch LED Dimmer 3V 6V 12V 24V 35V Max 90W

Tested with a 4-8v mini rotary tool and it worked well

…But I was wrong! The soldering fume extractor 3D printer build I purchased this for (and linked to in its instructions) showed all components in similar mounts. However, lookin at the potentiometer knob the far left front contact, upon desolating and removal of solder with a “Soldapullit”, would not loosen. I discovered that, like and inductor, a copper lead was tightly wound around that leg. When the leg did release it came up with the wrapped copper and lifted an imbedded, in laquer , trace with it then disconnected. The fan works but there is no speed control just on and off!!!

They look big in the photo, but they are too small. Have still to use to confirm their performance.

Bueno a mí no me sirvieron para mi proyecto tuve que comprar otro más grande porque éste se calentaba demasiado

Worked great on a rotating display motor. It adjusted the motor to the needed speed with no issues.

Easy to install... works great. I recommend coloring the + and - with a magic marker because their not marked except on the instruction sheet.

It appears to be well made but begins to get very hot at 25 watts and goes into auto shut down at just over 30 watts. To restart It needs to be shut off then cool off a while before powered back on. I'm using it to dim a LED track light and it will only reliably handle three 7W LED 12v MR16 bulbs.