4 Pieces Adjustable LM2596S DC-DC Buck Converter Reduced Voltage Regulator Power Module 36V 24V 12V to 5V 2A Voltage Stabilizer with Digital Voltmeter Display

I didn't have a rectifier bridge on hand so I made one out of four diodes. I added two 1000uf electrolytic capacitors in parallel for a near perfect DC signal. Without a load it measures 13.5vdc at idle. Just above idle, it's around 19vdc. I connected a battery and adjusted it to 14.5vdc above idle and it's very steady. I haven't run it long enough to fully charge the battery but expect it to drop accordingly. Using dual coils, the maximum output measures 7.2 amps! I wasn't expecting that as it's only rated for half that. Time will tell if it burns up or not. If it matters to anyone, I'm running it off of a Predator 212cc engine with an electric starter kit installed. So far, I'm very happy with it.

These units are great for little projects, especially making replacement power supplies and chargers. Maybe not for the Beginner who knows nothing about electricity (you will melt one if you wire it wrong) but most of us should have a few of these in our kit. I bought some LiFePo batteries and the company wanted almost as much for the charger, so I built my own with a drill charger and one of these. Good Making.

I used these to convert all of the fans on my Ender 5 Pro 3D printer to much quieter 12 volt fans. I have 1 for the PSU fan, 1 for the main board fan, 1 for the hot end fan, and 1 for the part cooling fan. I use my printer a lot so it's running almost non-stop and after a year plus a few months of use they all still work. As a side note, the fan speed control on 3D printers uses PWM, so it changes fan speed by pulsing the power signal on and off, but the output voltage is the same. As a result, when the fan power is set to low speed the signal is off more than it's on, and as a result the display on this converter won't turn on, but the converter appears to still be regulating the voltage fine. Just make sure you set the potentiometer while the converter is getting a constant 24 volt DC (fan speed set to 100%).

I was about to leave a bad review but after reading another review, I got it working. When using this regulator with a lower input voltage (I was using 12v) it is necessary to turn the adjusting screw many turns counter clockwise to reduce the output voltage. It was more turns than I thought possible on the pot. After that it works mostly. Some of the directions from the details section on Amazon appear to be for a different model as the display adjustments are not possible as described. If you want to turn the display off you're out of luck, same for calibrating the voltage reading. The input voltage reading was up to 0.4v off and the output was closer at 0.1 to 0.2v off. I didn't do a lot of testing but droop was pretty good up to 1 amp load with 12v in and 5v out. Over all it's a good regulator. Some of the 1 star reviews may be due to the many turns required to get the voltage to change is using a lower input voltage.

Great little voltage reducers. I use them in my DIY speaker box builds when I need to reduce down to 12v for LED’s.

Absolute garbage. First of all, the seller and/or amazon seem to think that next day shipping means, to ship it whenever the hell they happen to feel like it 8 days later. Second, when they finally did show up... THEY DON'T WORK. The voltage adjustment screw does ABSOLUTELY NOTHING. 24 volts in, 23.9 volts out. This is just a massive expensive resistor. Seriously, don't buy this garbage. It didn't even work once. Oh, and it is MASSIVE as well.

Using this buck converter to go from 24vdc to 12.5vdc in my Bambu Labs X1C to run additional LED lights inside the enclosure. Paired this with a simple 1 stage relay, controlled by the factory LED strip, so I can use the software light switch that is built into the X1C program. The buck was easy to setup and adjust the output voltage, but in testing and use, the PCB and MOSFET get hot to the touch when in operation. Not sure of the exact temp, but the buck was too hot to touch after about 5 minutes of operation. Other than the heat produced, the functionality of this buck converter is satisfactory so far. Would recommends.

Voltages on the one unit I tested tracked amazingly well with my bench power supply, probably within 0.2V. No load current was under 20mA up to about 30V input, increasing to ≈30mA with the display on. A long button press extinguishes the display. Due to the quiescent power draw, I wouldn't use it for charging a battery composed of cells smaller than 18650 liIons.

I wanted these for my 3d printer, so I could attach 5v and 12v fans to my 24v power supply. They're really easy to set with the display which shows you the output voltage and they seem to be pretty accurate when tested with a multimeter. You can also turn off the red 7 segment displays but there is a quite bright blue LED which is on at all times. You could just desolder it I guess if it bothers you. I haven't bothered to really test the output to see how clean it is since I'm just using it for fans but they're easily set up when you just need to get the job done. I've had a couple of them running for a couple of months now and the fans are still working so I guess theyre still good. These being adjustable have an added benefit that if you want to run your fans a little quieter your can run them at a slightly lower voltage, e.g. 10-11v for a 12v fan.

DO NOT BUY THIS PRODUCT! I have had 3 of the 4 screws on one of my boards completly fail and the wires fell out causing a arc. They have used cheap metal for the screws on the terminals and they strip after one use. terrible product.

Does the job. Testing the output and its accurate. Strong well made. Good display. Bright red leds. Good value

They are ok. The instructions on here are better than what comes in the package. Did the job they were needed for.

I needed these to modify my 3D Printer, I'd try smaller ones that lacked a display, and had to use a multimeter and a screwdriver I wasn't comfotable with, those ones also died easily. But these ones, even though they're much bigger, I'll happily take a bigger board if it means easier wiring and adjusting. I have used 2 of the 4 I purchased, and both worked perfectly. I am absolutely pleased with my purchase, and may even buy more in the future.