5 Pack LM2596 DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Step Down Module

Bought these to run some new fans for my 3d-printer, as I needed a way to step down from 12V to 5V in a compact form factor.These were super easy to solder to and well-labeled. You do need a multimeter to check the voltage setting as there is no display but this does make the component much more compact.Super cheap and work as advertised; would buy again.

I have used and deployed a number of LM2596 buck converters in various projects over the years. They are incredibly useful. A "set it and forget it" device, you can essentially dial these in and never worry about them again.

much better to both solder the connection wire to it and to regulate the output current than the more simple variants; it takes a few turns (around one turn per volt) to bring the current down from 24 to 5V for my use case in adding a wireless receiver to my PAR lights, but then they function very well

I only needed one unit in this package of five. The price for five was comparable to packages with less units so I chose this one. The positive and negative connections and the flow of electricity is well marked and I found these easy to connect to my power source and the one I'm using functions very well so far. The first unit I tried didn't adjust the voltage and after several attempts at connecting and disconnecting the alligator clips I was using for the initial test I gave up. The one I'm using is the second one I tried. I tested it in the same fashion before soldering everything together and it functions fine. I have not tested the rest.

I had a problem with them initially but it turned out it was some new to me solder I was using. Ended up giving me cold joints so would not connect properly. Had a little of my old solder left so used it and wallah all was good. Checked all 5 with test leads and they all functioned fine.NOTE: They are set to full voltage so to adjust these turn the screw CCW, it takes about 3-5 turns to get it to start adjusting (my setup is 12V in) might be different with other input voltages, took about 8-10 turns to set at 7.4V.

Overall good module, but please read the regulator chip datasheet before purchasing. At low output voltages, it has efficiency less than 75%. In my case, converting 12V to 3.3V at 2.5A overheats it in around 10 seconds (no heat sink added). Also, it drops over 170mV or 5% of output voltage, between idle and full 2.5A load.If you need high currents at low output voltages it makes sense to look for modern, high frequency synchronous regulators. This Simple Switcher family member is just too old and inefficient for such applications

Perfect for running various 12V fans and a 5V LED strip off a 24V power supply. At a few bucks a pop there is no reason not to get extra, there are a million uses for these things. As an added bonus there are dozens of designs for cases and mounts of all kinds floating around.Heck I couldn't build step-down converters for this price out of discreet components!

There isn't too much to say about a simple buck converter. They're easy to solder, easy to dial in, and just work. They don't have any sort of reverse polarity protection though, so double check your wiring before you power them up, else you release the magic smoke.Definitely something to keep a pile of on hand