Just wanted to thank Lexel for the Narsil M driver and follow-up. Astrolux S42 really nice UX. First mod but not the last…
v1.2 differs a bit from my BLF Q8 (v1.0) - 5 quick clicks goes to a momentary tactical turbo. A nice feature of this size light!
If you just want to replace without keeping the charging board its a pretty simple mod
Driver has 2 switch connection points and 2 LED outputs
You can also solder the old charging board on it and remove the MCU on it to get rid of the high standby current, charging works then but if you want to know the charge status you got to use Narsils battery check blinking out the voltage
The driver is very energy conservative, when it’s first turned off it draws about 4.66 mA (presumably the MCU is in an alert Standby mode) but after a few seconds it drops into a deeper standby mode and draws only 0.09 mA. I don’t know the split between MCU and switch LED but regardless that’s 95% less than the OEM Dragon Breath Mode.
Nice! It was tricky but it was much easier the second time. I wanted a rechargeable high CRI light so decided to mod another one. I mixed Nichia 4000k and 5000k 90cri emitters. I also mixed xp-l hi on my other S42.
I was thinking about converting to a triple like I did with my s41, might do that later eventually.
I found today, that the 30mm 2S driver when used in FET+1 configuration has a design error that affects only the Indicator LED Output
it needs a fix cutting one trace and do a bridge from LED resistor to MCU pin 3
No, you are good to go. It’s already been tested by Lexel.
When it comes to 2S lights, they produce 8.4 volts and the 7135 is only rated to something like 6v or 7v. In most cases (if you can buy the raven claw version) they can handle 8.4 volts with no issues, usually. Every now and then a 7135 will not be able to handle the higher voltage and cause strange things like leak voltage and the emitter might glow when turned off.
To combat this, and maybe because he can’t get the raven claw 7135 any more, Lexel has changed the design. It is more like the Q8 driver, FET + 1. I think you lose a bit of efficiency, but it’s more reliable. No one complains on the Q8! Lol