I’m not telling you what you should do. If you put 12x7135 in a plastic battery holder… that’s on you. Furthermore this driver is an UNTESTED work in progress. I’ve done some measurements, but I’m sure I also eyeballed some things.
This driver may be setup for FET+1x7135 or 11x7135+1x7135 operation. Of course it may also be used for straight-up FET or 11x7135 operation if that’s what you want.
Features:
- Dual PWM w/ either FET or 11x7135 on primary channel.
- Zener ready.
- Offtime ready.
- e-switch ready for dual-switch lights only. Zener modded drivers have a high parasitic drain in e-switch applications, so they should only be used with clicky+momentary setups like the TK35 and clones.
- ATtiny85 ready. The extra-wide footprint accepts both 150mil such as the standard ATtiny13A used on most BLF drivers as well as the wider 208mil package used by the ATtiny85 and some other ATtiny MCU variants.
Physical:
- ~36mm diameter (35.98mm at it’s widest)
- Files down to 32mm for non-TK35 applications [such as Maglite].
- LED- ring is slightly wider than stock.
- 2.1mm screw slots.
- 11mm LED+ or Battery+ pad w/ 6.6mm exposed
- Centered via to allow center-drilling for B+ spring bypasses in custom applications.
- GND ring on both sides.
The driver should flip over just fine for use in lights requiring a driver between 32mm and 36mm. You may want to paint over the LED- ring in that case!
For use in the TK35 clones I recommend stripping the bottom PCB OR using Vdd from the bottom PCB in place of Z1 / D1 / C2 on the top PCB. [EDIT: of course you should still use C2, it’s for decoupling the MCU.] In any case you’ll need to bring in SW+ from the bottom PCB and eliminate the “EN” wire.