Has anyone here used the “LDCH” 1.5v / 1.2v drivers?
(Not the “LDCH-29 3v-and-up driver, that’s discussed several places)
They look like this: 
(that’s from some guy selling them for over $20 apiece, but they sell for maybe $5 or less somewhere, I’ve forgotten where)
I’m wondering because I’ve put them in two flashlights that use the 4/3AF NiMH cells (18650 sized, repurposing “last year’s flashlights” to give away - using XPE amber emitters))
and I’m seeing strange behavior — basically high, low, and a rapid flicker for a few seconds in between. Wondering if it’s a bad ground or something.
The ones I bought claimed to have multiple modes and switch between them but I’ve never seen anything but the high, low, and fast dim flicker levels.
I’ll hunt up a better source and description.
EDIT — oh, it’s the LDCH 7880 driver