Hi there,
Because of using my L2i with Low Voltage drop in off and on these days, I get a little annoyed by the low PWM.
Does anyone know if its possible to tweak the PWM up to a non-noticeable frequency?
Has anyone done that?
Would it be worth sending it to someone that could do this? or would it be better to buy a new(better) driver, for the money alone of postage fees?
There is no easy way to do that. You could send the drop-in to E1320 and he could put in a new 5 mode driver(Moonlight-Low-Med-High-Turbo) with high pwm.
0.8-4.2V driver you mean?
Oh, no he doesn't have any low voltage drivers. Wouldn't the normal 7135 driver work since 3*1.2=3.6?
E1320 gets great reviews for his work. If you want to DIY, there are other drivers available with higher frequencies for replacement.
Yeah, that should actually be enough, but I do like that I could run the light on a single AA.
Maybe I’ll just replace the driver to what you said, one that has a low voltage cut off around 2.8V.
I can use this old driver for a DIY project.
If you have space available, stick a capacitor across the output to the LED. The higher he capacitance the better.
Please explain!
While the PWM switches voltage on and off, a capacitor can be used as a “buffer” for the current. While the driver is on, part of the current is used to charge the cap; while it’s off, the cap gives current back to the LED.
Suppose it’s 3A and 100 Hz PWM; at medium 30% the cap would have to yield about 1A for 7ms with a voltage drop of, say, <0.1V.
Then the cap should have at least 70mF… that would be quite big.
Thanks Dr Jones. 
It still doesnt make sense to me… Not saying that what you wrote is not true, just saying that I have no idea what you are talking about. Could you send some picture on What I have to do with what you said, and what this cap (capacitor I guess) looks like.
You`re talking to a noob when it comes to technical details. I know how a circuit board looks like, I can even replace one, but what part has what name, I know not.
Pictures are welcome. thanks
I'm no expert but here goes nothing. :) A capacitor is like a tiny battery. You would wire it up so when the flashlight is on it charges the capacitor but when it is off the capacitor releases then energy. Naturally this is all happening hundreds of times a second and it will end up raising the pwm frequency.