Mini LED Dimmer 5A 90W,DC Motor PWM Speed Controller 3V 6V 12V 24V 35V Speed Control Switch(4 Pack)

I have always hated how our Motorhome / RV bathroom fan only had a wide open on speed, this was loud and annoying. Last year I installed a different brand but it was large, hard to install, and never worked quite right. But this one was so much smaller and fits under the crossbar as shown in the picture. I Installed this little gizmo in about 15 minutes and now our fan can be turned from barely moving to full speed. This has been working everyday as needed, for about a week. I will re-post if it fails prematurely.

I use this device to control the current to a Nichrome wire foam cutter. It allows me to control the temperature of the Nichrome wire as it cuts though foam used to make RC airplane parts. I like the small size, ease of mounting and built in knob control. The power input and output connections are well labelled and easy to use. The price is low and two day Prime delivery make this an excellent value. I will order more of these for other projects.

Screw terminals are hard to use, they don't turn or loosen up like they should. Except for the screw terminals they worked great for my use. I am using 2 resistors and 2 white LEDs to light up my 3D printer nozzle. From bright to dim, they have a built-in on off switch which I liked

These are great as dimmers for L.E.D's and also as fan speed controllers. I use them as dimmers for fish tanks with L.E.D's. They can make the lights super dim and help prolong the life of the bulbs. My fish don't like bright light, so it helps them come out more as well. I also use them as fan speed controllers. They help the fans run quieter and consume less power while being ran on battery power. I have installed about 12 total units over the past couple of years and have only had 2 stop functioning properly. One died due to me using it improperly, so technically only one has failed with normal use. Sometimes they come defective out of the package, so I test them all upon receiving them. I have had about 3 out of 16 units arrive defective, but I was able to return the defective units for replacements easily through Amazon. I got the plastic crayon box from Walmart to house them and mount them on the wall.

I'm using this to provide a fan speed control on a small inline 12V DC bilge fan motor (2.5A max current). The off position gives a nice audible "click" and saved me having to add another switch. I haven't tried bypassing this to guage whether there's any power reduction at the "max width" setting. That would be disappointing, so might have to adjust review downward if that happens. Average Current usage definitely drops off as pulse width is narrowed, great for lowering overall power usage. My fan can run all day long on a 16aH battery. The controller doesn't seem to get warm, and construction/soldering looks decent. The thin capacitor next to the rotary control sticks up and is bent around easily, so be sure to mount this in an enclosure where parts and fingers won't contact.

Absolutely NO quality control. 😠 I ordered a pack of two PWM controllers. Neither worked. They would power up but no output. The issue on both was a cold solder joint resulting in no connection. If you have the skills required to track down the problem and fix it, this is a minor inconvenience. If you are a hobbyist that just wants to link modules, you will be very disappointed and need to return them.

First, the "pluses" - This came as a package of 2. I installed one in a travel trailer to use as a 12VDC LED light dimmer. It works great. The "minuses" - The second one was in pieces straight from the package. The potentiometer (variable resistor) had fallen apart making it unusable. Installation tip/hint: The input voltage and output voltage cannot share a common ground. If the grounds are connected, the controller used as a dimmer will not dim. You need to isolate the ground of the output voltage.

These Speed Control devices work great. I 3D printed my favorite photo into a lithophane and mounted it into a deep frame, lined the inside of the frame with a LED light strip, added this Speed Control device into the 12V DC power cord and voila, adjustable light to make the photo shine perfectly. If you need a 12VDC adjustable with on/off controller, this is what you need. Highly recommend.

The product is good and does the job, but it’s too expensive. There are plenty of alternatives at a fraction of the price.