As far as I can tell, these are based on the RV7 design that was sold a long time ago in small numbers by a member on CPF who claimed his mate had designed the driver.
But take note, to gain those high outputs from 1AA you have a high current draw when on high setting.
Could be fun to make a 1D maglite running 3 XPGs with one boost driver per LED?
I haven't found much of anything for 1AA or even 2AA unless the mA is low. I know it is limiting on purpose, because at full draw the battery would be dead in short order. I guess that I will, in the long run, give up all of these notions and just keep doing 3AA direct drive. I have never liked having to use a driver, just more to go wrong, more heat, more draw off the batteries.
I was just thinking of doing something different (small) but really it's not what I like. I just like bright lights myself. Just trying to think of something different.
D cells in a MagLite would be great, but at $15-20 bucks a pop for good D cells (plus a charger), I won't ever be doing one. I would love to do a Mag with 3 F cells and 3,4,5 or 6 emitters, but I could never afford the F cells or all the parts, so I keep doing the cheap stuff, till someone leaves me in their will..... Time's running out! Ha...
I just wanted to say that I'm with you. I wanted a driver to build a nice XML dropin for a Solarforce L2R (2 x AA) but there just no such animal except ones already installed in higher priced lights. The L2R body just sits on the shelf and I've almost thrown it away a few times.
Thanks for the offer, Bob. I’ve got a SF low voltage R5 I can use with it, but like you said… its low power. I think I’m just going to put that dropin back in it and a couple lithium primaries and throw it in the wife’s car for an emergency light.
I would love a driver that would draw 2A on high from either 1 or 2 NiMH.
Its really to bad the driver from the Trustfire R5A3 isn't available it pulls over 2 amps on one Duraloop AA and delivers over 4 volts and 1.8 amps to an XML an high plus 3 modes with no flashies.
I have also been looking for a nice single AA (only) LED driver, so far with no luck other then the DX one above. Looking how the circuit is made up though... I would think it should not be too hard to make (or modify) an existing board to give a higher current (and possibly better modes) then this board. The soldering would be fiddly but there looks to only be around 5 types of components in the circuit. I have a step father who is an electronics engineer, so next time I see him I will ask about it.
Must be quite a lot more then 2A surely? A single Duraloop even full charged isn't going to be much more then 1.5V particularly at 2A and probably a fair amount less. So if you're delivering 1.8A at 4V you must be drawing at least 4.8A and I would expect closer to if not above 6A (see http://www.candlepowerforums.com/vb/showthread.php?258999-NiMh-AA-Powered-LED-light-Current-Draw for example).