I just did a Wuben E05 with a fet+1, but I’ve been on a real boost driver kick lately. This is a E05 with one of the red convoy T2 boost drivers I have been experimenting with recently. A lot of the basic boost drivers you can buy are based on the PAM 2803 boost controller which lists a quiescent current of 1-3 mA. I measured a couple myself and they were both right at 2 mA. That’s a bit to high for a AA e-switch light IMO. The convoy driver uses a different boost controller and what I discovered is that ~5 seconds after power is applied the parasitic current drops to ~0.1 mA with a 14500 and around .45 mA with a NiMH. That’s not incredibly low but it’s actually lower than some production lights I’ve seen measured, and plenty good enough for me. Fully charged to fully discharged eneloop would take around 6 months if my math is right.
I recycled my filed switch board with 3d printed spacer technique for this one. I used a attiny85 rotated 180 degrees with the PWM trace cut and a jumper to the PWM pin on the attiny85. Switch connections were made directly to the legs on the attiny. I used Narsil, green switch LED’s and a LH351D 5000k 90cri.