I am currently looking for a cheap buck-boost driver module. I have a few hack/mod projects I want to get started on and I would love to have a single driver board that I can use everywhere. Something which could handle 2.2V-4.2V input would be perfect, so I am covered for 2xAA and 1x18650 battery options. I have a torch which currently uses an old XR-E emitter at 3.5V, and some XM-L2 emitters on the way which are only 2.9V, and I want to be able to drive both of these. Output current probably around 700ma to 1000ma, but I do know my way around a soldering iron and an oscilloscope so i'm not too concerned about having to change sense resistors to adjust the output. As long as the board is genuinely offering me buck-boost operation and current regulated output!
I have been searching and searching through the forum to try and find any info, but details on the cheap chinese drivers are a sketchy at best!
This one looks like its "old faithful" around here: http://dx.com/p/17mm-1000ma-5-mode-w...5v-input-15880
The driver in the picture is a NANJG-28, and it sounds like that was a pretty good one. But people have reported buying this SKU:15880 and recieving NANJG-112A instead.
The NANJG-112A I havent managed to find much info on. Can anyone say whether it is better or worse than the NANJG-28? Where could I order one from and be confident that I would actually recieve what I ordered?
Trawling through DX also managed to find me this one which like it could be buck-boost, though the specs do not make it clear at all. http://dx.com/p/3-mode-led-driver-ci...-8-4-2v-106484
It has an inductor on it, which is a good start. Does anyone own one, or recognise the design?