5PCS MT3608 DC-DC Step Up Boost Power Converter 2A Module Adjustable Step Up Voltage Regulator Board 2-24V to 5V-28V Output

I received 10 boards and tested 1 of them and did not work with 4.1v input. No change in output voltage regardless of potentiometer. Tried two more boards and they are the same. The boards should work with greater than 2v but did not work. I am returning them no point of checking remaining 7 boards.After further testing none of the boards are defective. The issue is that you need to turn potentiometer at least 20~30 turns all the way both sides and at one point output voltage will increase. Turn until u hear click sound. If no change then turn opposite direction and it should work but many turns in that direction.

First one I tried - Turn the pot, turn the pot, turn the pot...no change in voltage and suddenly it blows up. I was not expecting that, almost had to change my undies.Tried second then third - Turn the pot, turn the pot, turn the pot...no change in voltage. Then all voltage drops out and I noticed that they pulled my power supply down to nothing.Fourth through tenth - Garbage can. I'm not wasting my time or risking my power supply for these.

I use these on a commercial/industrial product and have had no issues. They are used outside (in an enclosure) subject to outside temperatures. I use them to provide 18-24 volts from a 12VDC supply for 4-20mA sensor loops. The sensors just need a few mA, so these little boosters are so much more efficient than a separate 24V power supply. They take just a bit to get set (follow directions) but seem to hold voltage well in this application. We load test each one for 24 hours but haven't found any bad parts so far.

It didn't work out of box. VOUT reads a bit lower than VIN, suggesting the chip not switching. I tried to adjust the pot and no luck.After reading so many 1 star reviews with the same behavior I was a little worried.Then I checked the datasheet of the IC (MT3608), measured the layout of the board out, eventually figured it out.Is it a 100k pot and when out of the box it was adjusted so that VOUT is almost shorted to FB, in which case the IC won't be able to regulate FB to 0.6V, which is its desired setpoint.One might want to crank the pot all the way counterclockwise (oh boy it was a lot of turns) so that resistance between VOUT and FB is closer to 100k instead of 0 and then go from there.I then connected VOUT net to my electronic load for up to 5.2V@2A load and it handles that just fine.It does get uncomfortably hot when wattage is above 15w or so, you will want to validate for your application. Also the regulation linearity is just so so underload. But hey I paid 8 bucks for 10pcs so wouldn't complain too much.TLDR: Measure resistance between pot pin 2 (the pin in the middle) and VOUT. If too low (less than a couple kOhm or so), it's not likely to work as intended. Turn the pot counterclockwise until this resistance reads in 10kOhm or higher, then connect your VIN and adjust from there.

Using them to step up 5v to 12v to drive a fan worked great. I've only used/tested a few but they work. FYI It takes quite a few turns of the potentiometer before you see the output voltage change.

Update: Lowered my rating to 3 star. I originally ordered a dozen in January 2023 and they worked great (original review 5 star). I ordered another dozen in Sept 2024 and the first 3 I tried didn't work. Order at your own risk, seeing other more recent reviews it appears there are some serious quality issues going on. There appears to be a few differences on the PCBs between my two orders (a new silkscreen on the back clues me in that they created new gerber files). Upon very very close inspection I notice a couple vias that are different, but there's only 6 components and this is a very simple circuit - there should have been no reason to change it. Also - from my original order there was one (pictured) where the inductor was broken when I took it out of the bag.So, ultimately, they are cheap - if you order them, order far more than you need and test them with a meter before trying to use them.Original review:Easy to and quick to use, might as well have a bunch of them handy for various projects. Extremely useful when trying to work with USB power, you can take the 5vdc from the USB and step it up to what you need to run another board if you need 9 or 12v instead. I wired it up to a usb port, tossed a voltmeter on the outputs and turned the pot. until I got the voltage I wanted. Be aware of the power limitations of your usb port of course.

For my application it works just as expected. For all you whinners and complainers,…… do a little math before you buy this.For example, in my application I have a 20 volt input and need 24 volts out at up to 350mA load current ( 1.2mhz ripple is tolerable since its for a string of visible LEDs.)The duty factor in this boost config is about 24% and the efficiency at 350 mA is approx 90%, so total power dissipation on the diode and inductor is about 0.5 watts.You might want to google “ boost conguration power calculations” before you purchase something like this and start a fire on your table.Also, these are not 0,55 inches in height, more like half of that or 0.25 inchesCaveat Emptor ( buyer beware)

I had the desire to reliably control my Noctua 12V 0.6Amp fan, but when powered from the wall-mounted, socket with a USB port (5V, 3.1Amp max supply). The fan works brilliantly within the full voltage range between 5.2V-12V. I am very happy with the purchase as the unit does not heat up at all and is stone-cold even after 3h of continuous work. The pot is quite sensitive, circa 2 turns per VoltLittle side note: Comments sections are really entertaining: it appears that only a few people had sufficient grasp of knowledge, that from 4.2V LiPo battery, even if you connect four of those boost units, you will not get reliable 110V AC ;)On the other hand - always choose the boost applicable to the project. Happy tinkering, guys.

I use these module in a product I sell. I need a source of 20V from the internal 12V supply.They are simple, convenient, readily available and inexpensive.So far, they have been reliable and easy to use.