AITRIP10PCS 1.5A Multi-Function Mini Boost Module Step Up Board 3.7V to 5V 8V 9V 12V Step Up Board with LED Indicato for DIY Electronic Voltage Moduler

Neat little chip.These are not continuously configurable, but discretely so instead.It would require microsoldering capabilities to do anything with the jumpers other than desolder the resistors they come with (keep this in mind when doing so, as it is effectively a 1 way operation)No biggie though, they are so small and cheap that i can just toggle between them.they're basically mistake proof - too simple to get wrong. Tiny and low profile, great for any project.

The board comes set to 12V by default, and in order to switch to 5V you need to desolder the two resistors. If you forget you are likely to blow up whatever 5V device you are powering.

Used to convert my multimeter to liion instead of 9v batteries so great for low power projects

I bought these little boards to use in single cell (1S) powered model aircraft, as most receivers don't work below 3.5v, and the normal cut-off point for the speed controllers is 3.0-3.2V.first off i had no problems getting the boards working, or setting them up for 5V output. these little boards are about 1g in weight, and about the same size as my 7A and 12A ,1S ESC's.I had no problems operating 3 or 4 - 1.7g servos from the output of these modules, they were supplying at least 0.85A peak current at 5V when using a fully charged Lipo battery.everything worked exactly as i expected until i got down to 3.4V (+-.05V) of input Voltage where the module started to drop the output voltage. And by 3.25V of input voltage the output was = to the input.none of these modules would output 5V below about 3.4v of input voltage despite the spec's listing 2.5V as the min input voltage.the module IS an improvement over just running directly from the battery, as I could get down to 3.3v on the battery before loss of power to the receiver. but it doesn't solve the issue I needed it to and let me get the full power out of the battery without risk of losing control in flight.

Wanted to convert 4.2v to 8v @ 1a. Couldn't deliver more than 600mah. Started to whine and drop voltage. Did not work for my application. Tried 2 in parallel, they wouldn't deliver more than 2v in parallel (set to 8v). Unstable output in parallel also, maybe not meant to run parallel. Regardless they did not work for me.