Mini Boost Module 10pcs DC-DC 3.7V to 5-12V Step Up Board Power Converter with LED Indicator

Works as expected. Although people have given it less than 5 stars due to it always outputting 12v. If you read the description and as iconed on the component itself, you have to unsolder one or two of the diodes(?) label A and B for less voltage.

Just the job. Very stable and cutting the programming links as per the table on the back gives perfectly correct output voltages.

Good product but these came in a zip lock bag altogether but not individually wrapped.The items inside are free to move and potentially damage themselves inside the bag.Mine are undamaged but 3 stars because this should be considered. I have voiced my concerns with the seller.

Just perfect.

I bought a pack of these. Very cheap but nicely made. Unfortunately, 3 of the 10 had the tops of the ferrite coil formers smashed off, presumably in the post, but not worth making a fuss in view of the price. The other surprise was that they all outputted 12V, irrespective of what voltage was programmed using the solder pads (as detailed on the screenprinted table on the reverse of the board). Handy if you want to run a 12V device from a 3.7V LiPo cell, a bit of a disaster if the device is expecting 5V. SO PLEASE ENSURE YOU CHECK THE OUTPUT WITH A METER BEFORE CONNECTING TO YOUR LOAD to avoid problems!

Did the job 4/5 used were functional

Bought these items to boost the voltage for a battery operated Alarm. Which I was supplying with a solar panel. The Alarm itself drew only 0.35mA. But this boost circuit drew about 8mA on its own. So quickly ran the batteries down. They do work as described. But not suitable for my application.