MT3608 DC-DC Step Up Boost Power Converter - 2A Module, Adjustable Step Up Voltage Regulator Board - 2-24V to 5V-28V Output Voltage (Pack of 10)

I saw the copious negative reviews for these, but they were dirt cheap so I gambled anyway. I rapidly tested three modules on my bench just to see what all the fuss was about. They all worked perfectly fine. Even with 3.4V input I could take them past 20V output at moderate load. At lower voltage delta, I could push them past an amp. Yeah, voltage will sag at high loads, so adjust based on your load. Voltage was reasonably stable for a given load and pot adjustment. At certain points I could hear some switching harmonics, but that’s normal.I think people need a reality check. You want a truly constant voltage power source? You ain’t getting it from a <$1 module. Sure the listing rates these at 2A, but also use some common sense. That’s probably an intermittent maximum rating and it very much depends on how much of a step up you are asking the little device for. More realistically, put a realistic power expectation in your head and understand that you need to derate as you increase the step up. I tested 12Vin and 16Vout with 2A output and had no issues. Efficiency drops as voltage delta increases. It’s a tiny little switcher IC and there’s no heatsink. Play stupid thermal games with it and win stupid thermal prizes. You want a comprehensive datasheet with exact thermal and load ratings? Go spend more money or build your own to spec. If you don’t understand that most trimmer pots are 20 turn, don’t play with module level components. If you just want a really cheap way to step up a voltage and you have realistic power expectations based on the size of this little IC, hard to beat these.

Great quality and 10 for the price of very few. These are amazing pieces that can be used in many aspects. Pictured we have it used attached to some wires that we attach to our rocket system for powering avionics and altimeters. They are long lasting and hard to damage. They work well with all the components we have utilized it with and do not have any issues!

Two of these failed immediately. Other two worked for a while. I am using 2 of them simultaneously for two circuits up-converting from 12V to 24V, powering a 16W circuit. But both of them failed within a few hours of use. The failure resulted in them producing only the input voltage at the output. I am on the last one (of the 5-pack) and I expect it to fail as well. Very unpleasantly surprised. Actually heavily disappointed. I removed 1 star for each failed board from the 5-pack.The ad says that these up-converters work with loads up to 2 amps. I am using them only for 0.7A each so they should be able to handle that just fine. But they do not. I requested a replacement package, foolishly hoping that another batch might work better. I will post an update once I test them out.Though I should not fail to provide more details about the up-converters. They come with nice pre-drilled solder pads, they are big enough for bigger wires for 2 amps, that is a nice touch. The adjustment trim-pot is pretty funky, the quality really is not good because when it is turned maybe 1/4 turn, the voltage barely changes, then it is just barely touched and now the output voltage jumps an extra volt. The trim-pot operation simply is not smooth enough for fine adjustments. Otherwise, once the trim-pot is adjusted, the board holds the output voltage well, no big deviations, maybe a tenth of a volt but that's also the reading error on my DMM so it's hard to tell. Size of the boards is acceptable and as advertised. If I ever get any that will actually stay working, I will slide them into a 1.5" heat shrink sleeve for protection.

Electronics Engineer Here.I purchased 30 of these for a battery powered lamp hobby project. I used them to boost a single 21700 cell (3.7v) up to 5v to power some LED rings. Setting the output voltage to 5v was easy enough after reading other reviews. It required MANY turns counter-clockwise before powering up, and then a few turns back clockwise to lower the output voltage to the 5v that I wanted.I hooked them up to a benchtop electronic load that was set to pull 1A, regardless of voltage. What I observed was these boards struggling to keep up. They emit an audible whine at 1A load, get really warm, and the output voltage dips down 200mV.I researched the MT3608 and saw they recommend a 4.7uF to 220uF inductor. (The boards come with 220uF installed). The MT3608 datasheet from AeroSemi had a "typical circuit" diagram with 5V output that recommended the inductor be 4.7uF. So I decided to give that a try. I ordered DR1050-4R7-R inductors from Mouser, ($0.70 each).Swapping out the inductor is easy enough to do with a soldering iron, if you have some experience. I had good luck heating up one solder pad, lifting the inductor slightly, then doing the same on the other side. Rinse and repeat until it comes off.The 4.7uH inductor has vastly improved these boards for 5V output!! Measuring input current and output current, the 4.7uH improved efficiency by almost 20%, and the boards are now silent when delivering 5V/1A. They still get pretty warm, mostly from the Schottky diode, but that's not surprising since the diode is burning off almost a 1/4W at this current.Overall these are fine little boards for a hobby project. The price is great, and at low output current they will work as-is. If you are needing higher current output at 5V, give the inductor change a try.

All 10 tested fine. Made sure to turn knob about 30 turns ccw until a click was heard then simply wired them up to 3.3v in and a voltmeter on the out. Turned the knob until 5-6v were read. Higher voltage capacity remains to be seen.

Nice power convertor

Some worked, the rest was dead on arrival

Idk if these work well. I wasn't able to get them working. I might have been turning the dial the wrong direction and counterclockwise might be increase voltage. In a new purchase 1 was that way and another was clockwise. I watched videos to see if I was just crazy and others talked about having to solder two pins together that is not true. These should work right out of the box. Glad amazon has these.