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

Good value for money. Note : As said in other feedback these are small and surface mount. Has 4 fixed outputs, and if needing less than 12v (the default) you'll need to de-solder up 2 very small surface mount jumpers/resistors (A/B). Have a fine point iron ready :-)

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

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

These are perfect for I need but make sure you check if you want 5v (there are two tiny components that you need to remove). I think the default is 12v otherwise. They are tiny so a soldering iron with a fine tip is useful but at a posh you cut try cut them off but be careful as you may break the traces using this method

Just used side cutters to remove the diodes according to the diagram on the back of the board.

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.