Eiechip DC-DC Step Up Converter - USB Power Module, 2V-24V to 5V-28V, 2A MT3608 Micro USB (Pack of 10)

They work great and are super handy little boards, have used like all of them in various projects

Great Product, Great price and as important Great Company to Deal with (package got rough handling and three ferrite inductors were broken and issue was graciously handled by Putian Xiuyu Duoyu Trading Co. Ltd.JUST REMEMBER TO TURN THE POT 15 CW 'LAPS' before powering.Great device, tried in several circuit ideas.Already packaged one to convert 110V led gooseneck lamp to battery operation for safety (no cords) Lamp is mounted to mini parts sled on table saw. Hacked LED series strings for multiple 24V strings and added 1/8 W resistors to lamp The Boost converter ran without hesitation or much heat at 24V 1A until battery cuttoff engaged, about 1.9 hrs. More time than I need to spend on saw at one session. LEDS did not flicker or show any light artifacts from boost converter (used as received - directly connected to battery manager module. Because of low heat, just used board attached to enclosure as heat sink. Easy Peasy.Bob

A solid 4 stars. Only if you read the instructions from the manufacturer and others. Turn the full 15 turns clockwise before powering. This puts the unit at full voltage around 28-29 volts. You cannot go too far as long as your gentle and slow. Then turn counter-clock with your meter attached to lower the voltage. I did smoke one by going too low. I used the USB connector with 5 volts to set. Then when I swapped to a 3.7 volt battery attached to the pads. The output stayed exactly the same to the hundredth of a volt. A small load on the output helped me as two of my 5 volt supplies would not provide power as they sensed no load. I did not know they needed that. A cheap phone charger let me know this. I have four of these set at different voltages and working so far. All around an amp or less. I labeled the face of the pot with a fine sharpie what voltage each is set to. I only smoked the one and now I know how to avoid this.

I have read reviews stating that some of them didn't work. I have not had this issue. It is important to follow the directions and turn the control screw clockwise at least 15 times before powering it for the first time. After that just turn the screw clockwise or counterclockwise to your desired voltage using a multimeter. I found it easy to solder my leads to the unit, and use my multimeter to get the desired voltage.

LOVE THEM WILL REORDER WHEN NEEDED

I'd give these -5 if I could. These blow up easily and when they do work, the output Voltage drifts. I'm using them in low power applications which should make them more stable, but not these units. I would gladly pay $5 or even $10ea for high quality boost converters in this size. But these are absolute junk. I will be making my own for my applications from now on.

Right on,Ill admit I'm somewhat of an overthinker. I wasnt sure how to orientate myself in relation to the board so as to have the baord facing true north along with myself before conducting the preliminary fifteen turns prior to operation. I contemplated that if I were to turn the nob whilst standing in erroneous relation to the propper face of the board said turns would then so in fact be uncondusive to the preliminary operating procedure and thus cause unforeseen damage to the board or overall circuit as a whole. After a moment of deep contemplation,meditation and reflection I concluded that when in doubt -one must move about, that there is no use in contemplation and preparation if the results of such yeild stagnation in ones efforts to pursue ones goal. For life is a battle, when you are pinned down in you must move. With these here ten boards I figured surely Id eventually get it right. With this in mind and good ol righty tighty, lefty loosey, counterclockwise to the left you silly goosy, I now had the courage to continue to follow my heart and dream so yabadabo thank you WOWOONE for your ten pack of dc to dc step boards they were funky fresh!

I probably shouldn't complain given the ridiculously cheap price of this unit. The vaguely worded output is claimed to be "5V-28V 2A." To me, that should be able to handle 12 V at 0.8A. I followed the 15 turns on the pot per instructions. Provided 5V input via the micro-USB connector. Used the pot to set the voltage to 12 V under no load with my multimeter. Then attached a 12V blower that draws 0.75 A, and it ran, but the blower seemed underpowered based on sound and feel. Checked the voltage and it had dropped to 11.1 V. Very slowly turned the pot on the unit to higher voltage to try to get back to and the unit could not get back to 12V. Voltage started oscillating wildly. Repeated this multiple times with the same results. So, for the price, I think you get what should expect, but not exactly what you paid for. To my surprise, I then tried this other unit from Amazon, and it did the job: https://smile.amazon.com/gp/product/B074R7FDCR/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1