10PCS MP1584EN 3A Mini Step Down Buck Converter DC-DC 24V to 12V 9V 5V 3V Adjustable Step Down Module Replace LM2596 Compatible with Raspberry Pi Robort Parts DIY Kit

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 !

I tried 4 of them at 3.3, 5 and 9 volts output with 12 volts input. In all cases the output voltage was much too low to operate the micro controllers. Even though the adj pads were not shorted the potentiometer would change the output. If the adjustable pads are shorted the I still could not get 5 volts output. On the plus side they are small and inexpensive.

Great item and fast delivery thanks

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.

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

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.

Worked just as they should. Also 3d printed a case for it.

I am in love with these little things. I use them all the time in projects and I have never had one fail,and I am an expert on releasing the magic smoke from electronics😅.These modules are also incredibly small,which makes them great for projects where space is a concern.One down side I can think of is the little trace you have to cut to use the fixed voltages.It's extremely tiny and pretty tough to get at, I have stabbed my finger on at least two separate occasions with an xacto knife trying to get at it😫. ( you need to cut this trace to use the static voltages, it took me a minute to figure out why the voltage output was off, so I thought I'd mention it in case someonje else missed it too.)The En pad is pretty nice too, makes it easy to turn the regulator off to conserve power.I am always really happy to find a component that has had a lot of thought put into it's design.Anyway,although these aren't quite as small as a LDO, they are still very small and can put out a lot of current without getting hot, these are definitely a great module to have in your parts bin.