Looking for a 6v ~2a driver

T

Tmad

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Hey all, I've tried searching and checking out the KD/DX sites and haven't really found anything. I'm looking for a driver that I can use 2 cr123a primaries on and have 1.4-2a. I'd prefer 1-3 modes. I know you can run the 7135 drivers on 6v but they are just so inefficient at 6v. Any help is appreciated.
 
schizeckinosy

schizeckinosy

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intl-outdoor.com seems to have some. I have no experience with them though.
 
Justin Case

Justin Case

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You can modify the AX2002 based drivers DX3256 or DX26110 for 1.4A-2.0A drive current.

The DX26110 comes with an SS24 Schottky diode (at least based on the photo on DX's web site, however reliable that is), so all you need to do is solder in the right sense resistor value. For the DX3256 and its SS14 Schottky diode, you should also upgrade the diode.

I like the Toshiba CMS04 Schottky diode.
 
T

Tmad

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Thanks for the recommendations. I was hoping for a plug and play but may have to mod em
 
Justin Case

Justin Case

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You do understand that you posted in the Homemade and Modified Flashlights Discussion forum?
 
T

Tmad

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this is only one part of the project and yes I was hoping I could just solder in a driver already built. I was having a hard time believing there weren't any drivers made for two primaries at even 1.4a.

More importantly, to mod a dx3256 to 1.4-2a all I need to do is solder in the toshiba diode? The only drivers I normally mess with are 7135 based so I have very little knowledge of others. Thanks
 
Last edited:
Justin Case

Justin Case

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As I wrote in post #3,

The DX26110 comes with an SS24 Schottky diode (at least based on the photo on DX's web site, however reliable that is), so all you need to do is solder in the right sense resistor value. For the DX3256 and its SS14 Schottky diode, you should also upgrade the diode.


Translated:

DX26110: needs only the correct sense resistor soldered to the board
DX3256: needs sense resistor and upgraded Schottky diode

To determine the sense resistor value R, use the following formula:

R = 0.25/I,

where I is the desired drive current in amps. So if you want 1.5A, you need a sense resistor of 0.167 ohms. I vaguely recall that I've used 1206, 1/2W sense resistors on these boards. Outfits like Digikey sell them. You could de-solder the existing sense resistor and replace it with an 0.167 ohm sense. Or you could solder a second sense resistor and keep the first one. I believe that there are two sets of sense resistor solder pads, and they are wired in parallel. So if the existing sense resistor is 0.25 ohms (to give 1A drive), then you need a 1/2 ohm sense. Digikey should also sell the Toshiba diode, if you need that.
 
Last edited:
T

Tmad

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Very helpful. Thanks Justin, have parts on order
 

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