The driver is pretty simple. However it looks like there are some things hurting the efficiency. Idk?
The driver uses two large limiting resistors that have a total resistance of 1.32 Ω.
It is interesting that the driver uses the same fet for reverse polarity protecton and for the output mosfet. So the current travels through an fet twice before it reaches the led. I believe this is less efficient than using a diode for the MCU only like the BLF drivers do?
However the reverse polarity protects both the driver and her charging circuit. So after the rpp mosfet the batt- is isolated from the rest of the driver. The only other part connected to the host is the switch.
All of the charging circuit is contained on the vertical switch pcb apart from the rpp fet. I am unsure if the charging uv has rpp or not. I’m assuming not.
The charger has a program resistor of 1.5k Ω. This should give a charge current of .66 amps. This is assuming that the charging ic closely resembles the MCP73831/2 as I couldn’t find a data sheet for the HXN-MH. Someone somewhere mentioned a connection but I’m not sure. The pin layout seems a little different so there might not be any relation st all. Idk?
Bwings, that looks great! You beat me to it. I’m stuck on finishing the firmware but I should have done today or tomorrow. Was the pill hard to pound out on your sample? What is the chip marked A6SZ?
Thanks for all the likes and comments.
Yeah, the pill is press fit and hard to pound, was tried to heat before, I used a 16mm brass tube and press from battery side. The tiny A6SZ is AO3416 Sot23 Mosfet.
Little late, but yes - Wow!! Impressive mod there bwings. Don't think my 60 yr old eyes and hands can do that level work, least not in a timely manner...
Forgot what I did to loosen the pill in my M3 mod (yes 60 yr brain on many beers), but recall it being a little stuck. Worked on a bunch of similar press fit pills though, bout always can find a way though.
Ohh - sure looks the same as the OTR M3 - same driver setup and brass pill piece, switch board, etc.
This light has definitely given me the biggest mechanical challenge of any mod thus far. It’s fun though
I’ve also had a hard time choosing the right emitter. It’s dd but dd is only accessible via double click. Still, if I want to use 219b, 219c I will need to reduce the 2x click turbo as well. Maybe an xpg3 would be ok and xpl2 would probably do well though only for short bursts. But putting a direct drive driver in a light like this shows it’s desire to make an impression. Any of the old gen leds will work well but will fade more with the battery on regulated modes.
So, I think I would like to stick to the plan and make an impression. I have an xpl2 here with 80+ cri and if the beam is not satisfactory I can add a shuttle filter.
Ahhh! What am I thinking! A useful edc light like this without 90+ cri! I can’t let that happen! Maybe tomorrow I will reconfigure my hex file to accommodate a 219c 4000k 9050. Xpg3 90+ would be an option as well but only if I could find a tir lens to fit this thing.
What do you think? Am I making the right choice? 219c?
Emitter choice for this light was confusing me too, I’ve two of this running XP-L V6 1A and dedomed XP-G2 S2 0A, I like dedomed XP-G2 more, about 800 Lumens and 20kcd (280m) from this small light has amazed me. The including battery from this light it quite good compare to Efest IMR, and can deliver high current too.
Hmm? Didn’t think of xpg2 dedomed. In fact I don’t have any lights with xpg2 dedomed. I’ll have to look through my parts bin to see if I have any xpg2 collecting dust.
The decision is a bit harder than usuall because of the the modified ramping and once it’s back together I’m not taking it apart again tomrrflash. The effect of the mods to the ramping tables will be affected greatly by the led chosen specifically the vf of that led. An led like xpl2 with low vf could have a max of 8amps where 50% duty cycle would still be 4amps. The output would be about 1800&1000. Compared to xpg2 where max amps will be 4.5 for 900 lm and 2.25amps for 500lm.
The included battery is my best performing 16340. I wonder where they are sourcing them? Beats efest 550 and 700. At 2amp discharge the numbers are 450 and 475 for the efests and 586 for the mystery cell
Do you have any pic of the battery LightRider? If you could post it would be nice :+1:
BTW, how’s the flashlight working? Mine will probably arrive next week!
I’ll ‘stick’ with the ‘stock’ light, but it’s good to know how are the modded lights working
I’m stuck on finishing the firmware but I should have done today or tomorrow. Was the pill hard to pound out on your sample? What is the chip marked A6SZ?