Dorhea 10PCS 5V Regulator Module Mini Voltage Reducer Adjustable DC 4.5-24V 12V 24V Step Down to 5V 3A Buck Converter Board Reduced Voltage Regulator Power Supply Transformer Module

Still working with them but they seem great to me. No issues came perfectly sealed, shiney and awaiting your project!

NOT 24V tolerant! Blew up two of these trying to buck 24V to 5V for a project. These definitely don't accept 24v input.

These work great for a esp32 project I am working on. Keep in mind, these are designed to used the adjustable pot by default. If you want to use the fixed voltages then you need to break the trace right above the adj pads. There are two dots, break the trace between them.

First of all, everyone complaining about the voltage being off in the reviews here, they are not cutting the trace to the voltage adjustment like the instructions tell them to. I have tried the 5v and 3.3v jumpers (after cutting the adjustment potentiometer trace) and the voltages out are right on. The problem I had is that some of them spectacularly fail when first powered up with 14vdc input. Two of them worked for a while, but then failed and burned out the Pi Pico's that they were powering. I had made a custom PCB and was impatient and soldered the Pico in before I had the sockets. Yes, my bad for doing that. It's quite an operation to get a Pico back out without destroying the PCB. When these buck converters fail, the IC chip on the board is reduced into smaller pieces. These are really nice and small and have accurate voltage output, but I have had 3 out of 3 that I tried fail. Two of them failed after being used a while, and one failed immediately even without a load connected. I will experiment some more to see if I can reduce the failure rate.

Nice size, but not reliable. From 10 I can only use 3. Most of them didn't accurate reduce voltage. I use fix and adjusting. At 18V they blow out, even the specs say 20v. Won't produce more than 1 amp. I did try for 6v servo motors and 12v fans. Didn't work.

First tried using the preselected voltage solder tab for 5v. Fluke meter showed output at 4.1v. This was disappointing, next time I just soldered for adjustable and used the pot to adjust to what I wanted. I am assuming they just used crap resistors for presets, makes you wonder if other components at just as shoddy

Yes. They are small but with a magnifier and good solder skills, you can breeze through the setup. Be sure to cut the adjustable line as directed to remove the potentiometer when using fixed values. (e.g. 5v)

Don't waste your money or time, this don't work well, specially at near 24 V input. They are junk.