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

Great product

I had AirTag units in each of my cars and my parents' cars. If I was gone for a long period, the AirTag would run out of power and become useless in the event the car was stolen. I opened the AirTags, soldered these units to them, and now they work great without the worry of the battery running out. I installed them directly to the car battery with a fuse.

Used for some small electronic projects. Works as advertised. Good seller.

These are well built little converters with very fine adjust-ability, calibration and a nice display for in/out voltage. They are not ideal for battery power because of the parasitic draw of the display. I use them to power a 5V dash cam with LiFePO3 battery in parking mode. The led light turns on by default every time you power up the device and uses 3/4 watt idling. You can turn it off but in my application it is difficult to reach the button. With the light off there is still a very small power draw that switches on and off but not enough to drain a battery (3/4 watt will). I like them but am going to try the DROK version with no lights or display.

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.

The voltage converters themselves deserve a five star rating but like many others here nothing I did would get them to adjust. The seller says to turn counterclockwise 20 times and then try again. He's wrong. The switch used to turn the power supply on and off also selects if the display is showing the input voltage or the output voltage. After turning it counterclockwise 20 times press the button until you see three dashes. This is the output voltage and turning the pot clockwise will now allow you to see the set voltage.

Each of the Bucks came packaged in their own anti-static pouch and all but one tested good (see below). These all took a good number of counter clockwise turns to get them down to the 12 volts that I needed but they came within a few tenths of a volt compared to my good volt meter readout. I bench tested each one with a good digital power supply at 24 volts input and the boards outputs were all around 23.5 volts output max, no load. Not bad for a inexpensive board. Once I hooked up the fans I tested the boards to make sure that these are still putting out the 12 volts with the fan load and the held the voltage fine. This was with a small fan 40mm and light loading.I am using these boards to convert my AnkerMake M5 3D Printer fans from 24 volt fans to much better quality 12 volt fans to reduce the noise that the 24 volt fans produce. These work but one board came with a 220uf 25V capacitor that had separated from the board (see photo). One of the surface mount capacitor legs had separated from that Cap. Bad solder joint on the surface mount Cap. I only had some thru the hole caps of the same spec so I used one and that fixed that board. So now I have 4 good converters.These only get 3 stars because of the bad quality control. The capacitor should have been detected at the factory. I did check all the other boards for loose capacitors and other parts but I didn't find any other issues. Looks like getting good or bad boards is hit and miss.

The media could not be loaded. This is exactly the device I was needing to use for voltage control.Love that it has both input and output voltage display.