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

Bought three different styles of step down regulators in last order . The entire lots of the first two types were rejected as defective and completely non functional . These little 5v step down regulators however work fine . Out of 10 units the output voltage from the same source (battery) ranged from 5.07 thru 5.21 volts . There is some variation in output voltage but .14vdc total spread is not fantastic but also not terrible either . Can't speak for longevity , noise , ripple or current capacity at this point . PCB's appear well soldered , can't complain for the price these days !

High defect rate in these converters. Approximately 50% of the boards I tested were defective and could not output a suitable voltage in line with the description (Example 12volts in, could only get 1.5 to 2v out). Many had potentiometers that were seemed to 'jump around' and couldn't hold a consistent voltage. They were shipped in regular polyethylene bags without anti-static packaging. These seem cheap and a good value, until you realize you've wasted time with bad boards and have to sort the bad from good. Additionally, the boards were of inconsistent dimensions--they came with 2 different widths. this made packaging them into a project more challenging. The only reason I kept these were I ran out of time.

Great item and fast delivery thanks

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

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.

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.

It's a decent power converter module for the money, EXCEPT the module doesn't handle the advertised voltages on the input. I bought these with the intention of bucking 24V down to 5V to power an ESP32 in-line to control some LED strips. For set up, I cut the trace for the adjustment pot, soldered the fixed 5V pad, and tested 5 of the modules. Every one of them only output ~5V up to 17V in, began rippling heavily around 18V in, and dropped out completely beyond that point. I'm sure there are a ton of other great use cases for this in circuits with smaller input voltage requirements, but unfortunately this isn't it for my 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.