BOJACK Low Voltage DC Motor Speed Controller PWM 1.8v 3v 5v 6v 12v 2A 30W Adjustable Driver Switch 1803BK 1803B (Pack of 2 Pcs)

This compact PWM controller handles its full 1.8–12‑volt range cleanly, giving smooth, predictable speed control to a 12‑volt fan without any stutter or dead spots. Installation is simple thanks to the clear terminals and small footprint, and the board feels sturdier than most budget options with solid solder joints and a responsive dial. Functionally it does exactly what you want — stable output, wide adjustment range, and no noticeable heat buildup — making it useful for fan tuning, small motors, or battery‑powered projects where efficiency matters. A dependable little unit that performs well for the price.

FANTASTIC ITEM! Great price! Works perfectly as described. I needed something to make a 3V DC motor run at a slower speed. Unfortunately I’m not well versed in electronics. I was going to ask someone on FB what to do. Then I thought of asking google AI what to use. It came up with this very controller. No instructions but super easy to install. The four terminals are clearly marked: Motor plus and minus, and Power source plus and minus. Your wires are screwed in with tiny screws and held firmly. Can’t be any easier! It’s small and doesn’t take up much room, and the control knob clicks when put turned off and on. There’s a pilot light showing when it’s on. Two for $7 with free Prime shipping! You can’t beat this!

Works perfect as a fan speed controller in a DIY fume extractor.

One of of the two units was bad. I used it to make my rv range fan variable speed. Easy to adapt existing wiring to wire in to the PWM unit. The defective unit did not vary the voltage and only ran off or full speed.

Works with no issues. running a 1 amp combustion fan with it from a battery.

I had a couple of small (4") 12v fans that I purchased for our RV, but they were single speed, and that speed was very high. These were just the ticket. They are small enough that I was actually able to get them tucked inside the fan's base housing, and wiring them was simple with the screw-clamps. The variable speed is excellent - I can slow the fans down to very slow, and all the way up to very high - smoothly.

Great little voltage regulator to slow down the speed of some of the hobby motors out there.

Installed in a 12v system. Both of them blew up.

Used to reduce the RPM of my rock tumbler. I can get real slow or not. LED dimmer could be the next project.

The speed control doesn't consistently work between the 2 I was given. The knob didn't fit tight and falls off.

One worked good the other didn't work at all