First, yes I'm aware of fellow Kiwi torchboy's driver list, which has been very helpful in my research :-)
I'm looking for cheap drivers for red power LEDs for 3x or perhaps 4xNiMH and 1xli-ion. Something under US$5 or US$15 for 3 including shipping for one. A slow flashing/blinking mode would be good too although not essential (edit: since I may add blinking myself if necessary). I live in NZ so anything in the US, UK etc, even probably Australia is likely to be expensive when shipped so realisticly I'm looking at DX/KD/eBay etc.
The only things I've really came across are the AMC7135 linear regulator boards (likely crappy efficiency given the low Vf), AX2002 boards (sadly don't have modes, at least not cheaply and not blinky/flashy) or the LEDA 0712 boards (have modes but likely less efficient then AX2002 and limited info exists on these, I haven't even seen a datasheet).
One of the issues here is while there's ample headroom between the Vf and input voltage, many of the chips aren't rated to go that low, for example from the AX2002 datasheet, 3.6V input is the minimum input and I still have no idea what happens below that when there's ample headroom from the Vf. Also from what I gather, most 5 mode boards tend to have a rather fast strobe.
There a bunch of shot in the dark stuff like KD product ID 9908, 9910 and 9912, but I haven't been able to find out anything about them and I'm not particularly interested in being a guinea pig :-P and they and exactly cheap and don't claim to have modes even.
Are there any other drivers people would suggest I'm missing? Or any other thoughts, suggestions etc? As you may have guessed, things like the microbuck or bflex etc are a bit too expensive for my needs.
I did make a post at CPF http://www.candlepowerforums.com/vb/...d.php?t=285379 which has some more details.
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Thread: Cheap buck drivers for red LEDs?