Manual 12V DC Variable Speed Fan Controller with Molex Connector

I am using the device to control (6) 80mm fans in an old aluminum case with molex connectors. They start up with the system and make a hurricane of noise. Since I don't have money to buy the case I want, I simply bought this and it allows me to tone down noise and air flow in the case to a respectable, almost inaudible, level. In a short sentence, it does exactly what I bought it for. Here are some of the downsides, caveats or features of the product. Continuous fan speed control. From it's lowest setting where the fans are barely spinning, you can smoothly increase fan speeds easily. Other devices have just a high or low setting, this one lets me change fan speeds until it is exactly as loud as I want, given the task my computer is doing. If you read the other reviews, you'll know the max power is limited by this product. I am not an electrical engineer so I am not sure why an analog switch such as this is either tapping power from the source or increasing resistance so that less power is flowing no matter the setting? Seems like the all the way "max" setting should be equal to or closer to the power without the switch in place... but it does not reach those power levels. On the other hand, if you wanted full power, a device to limit power is the exact opposite of what you need, so I'm guessing other users have a more specific need where it affects their usage. For me, just controlling the noise and air flow of case fans is exactly what this does, so I am happy. Regarding setup, there were no instructions included in mine, and even though I realize most users who buy this probably already know which ends to use, I want just throw out there you just match the end that fits the power connector on your power supply cable first, and plug your devices into the other end. Since my case is a "hand me down" I am missing a 5.25" drive bay cover. However my case has a door that covers all the 5.25 bays. This allows me to put this switch in the open bay and close the door and I can access it without opening the case. I'm not sure how others are using this... but for once, missing a part is actually helping me!

My computer has a huge 230mm fan on the top that I wanted to turn off while podcasting. This switch allowed me to turn down the RPM and eventually turn it off at will. The only other fan on the motherboard was controlled by software allowing me total control of the noise level. Firm Click to switch on and off. Small footprint.Drilled a hole in the case and mounted the switch inside with only the knob protruding. Perfect.

Bought this to control the speed of a computer fan. Didn't work out of the box. Took it apart and noticed that a wire was ripped right off the board because these units are put together very cheaply. Re-soldered the wire back to the board, but the unit would only function as an on/off switch... The dial did not vary the speed of the fan as it was supposed to... Others have had this issue...Wasted $17 on something that didn't work. My suggestion... Go find something else

I purchased four of these. I like the size and the cables are the right size for my application. however, there is no rubber sleeve to help prevent the wires from pulling right off board if you pull a bit on the cables. I guess that adding those rubber sleeves where the wires meet the circuit board would increase the cost beyond the manufacturer's target price. My main complaint is that the controller does not do a good job regulating 12V DC current. There are really only two or three speeds, and high is not full power. Moreover, I got significantly results from the four controllers that I purchased. I used these controllers to regulate the speed of case fans. The fans spun much faster with no controller than with the controller on high. I purchased four because this controller fit my project perfectly and I was willing to sift through a couple of them to find one that could give me full power.

Works as expected. Connect power in one end, fan on the other, and adjust as desired. Its bulky size and finicky molex pins that wobble, requiring a bit of muscular finesse to make a tight connection, detracts from its overall design. I don't mind its ugliness, but I had to use a needle nose plier to hold the molex pins steady when making connections. The molex pins seem to be cheaply made - their barbs failed to hold up during the compression fit. Otherwise, it works as expected.

It works but for my application it doesn't change the speed of the fan. I have a slower speed fan then it can handle. I am using as a safety cut off switch.

been running 24/7 for over a month. i bought 2 of them, one of them i hooked up 2 12v fans to it and after a couple weeks it stopped being able to supply full power. so don't hook up 2 fans to one controller.

I have this connected to their 12/5v 2amp cable and it kills not only voltage but amps too. Only does 12v Max volts is 10.45v min 5.04v min amps at 5v is .38amps max amps at 10.45v is .8-1.1amps So this at max power kills over 50% usable power. I dont have a killowatt meter so I can't tell if this works by using full juice and kicking the rest off into heat. Maybe someone else can explain better and test for that. Because it would be really wasteful if it worked that way. If you don't need more than 5-10watts of power this will work but if you need 36-40watts like me this is devastating. Took me to long to test this so I can't return it anymore :/ This may work for your needs but now you know the parameters this works on so you can decide if it works for you or not.