KL4 dilemma - Help needed

[Mobius]

I'm trying to put a TW0K into KL4(don't ask why, just had to /ubbthreads/images/graemlins/smile.gif ) and I know this isn't exactly something new and exciting so please bear with me... After digging through various threads and posts I'm more confused than ever.

Here's what I gather:

1)For 1x123 application I can keep the stock circuit?
2)For 2x123 application I need to replace the stock circuit with a buck converter?
3)Is there a way to let a luxIII KL4 run on either 1 or 2 cells?
3)What is the current draw on the stock ciruit? Can it be changed by swapping out the resistors?

I'm aware that I can save myself all these trouble by going with other better alternative such as Aleph. However, I just really like the form factor of KL4 and I have three of them lying around /ubbthreads/images/graemlins/grin.gif Any input are welcomed.

 

[Chop]

You can change the bias on the stock converter. In stock form it is biased for around 630mA. I believe the sense resistor is a .33 ohm resistor and is near the edge of the board. You can boost output to 1A by soldering a 1 ohm resistor in parallel with the .33 ohm resistor.

After doing the change, you can then run a Lux III on the stock converter at 500mA or a single 123 or 1A on a single li-ion cell. 2X123 or more will likely cook everything.

If you want to be able to run it on 1X123 or 2X123, then you'll need to go with a Wiz2 board, but running a Wiz2 light at greater than 500mA on a single 123 is a bit dicey.

I've done a few dozen KL4 mods, in different ways, and it may be worthwhile for you if you already have a KL4 and want to do something different with it. The manner in which you should mod it depends on the battery configuration that you want to run it on.

 

[Ginseng]

Chop,

You are the master of KL4 mods. I still remember that great TWAK (I think) you made for me.

Wilkey

 

[Mobius]

Thanks Tony. You're the MAN when it comes to KLx mods.

For now I think I'll go with a single 123 and stock converter. Now only if you can tell me what type of resistor are those, or what spec should I use. Browsing through film resistor catalog is giving me headaches. /ubbthreads/images/graemlins/confused.gif

 

[Chop]

Guys,

Thanks for the kind words, but I can't take credit for all of that. Although I did get a bit creative with the mod process, all of the information (the important stuff) came from CM. I am a fast learner though.