Did some tweaking of the FET driver in my K2 triple. A while back I piggybacked a 15mm FET-only driver in the K2 and put in a triple XPL with CUTE 3 optic. Lately I was wanting the low to be lower, so I experimented with adding a gate resistor between the gate and pin 6 of the attiny13A. A resistance of 220 Ohms resulted in a low about equal to the moonlight mode in a Bistro FET+1 equipped light which I think is about 0.5 lumens. Before adding the resistor the lowest it could go was probably about 5 lumens.
Well,triple was my ultimate goal for the second K2. Didn’t mention it earlier as I needed to get the Fet functional first. I
Already have the spacers figured out with 2 xp32 sanded down and the x6 spacer to fit height wise.
@ EasyB
Did you keep the stock switch and lights for battery? Will search you for info…
Thanks Tom E.
Tried messing with this K2 driver earlier again today. It is beyond me to get it Fet with the battery indicators functional. Thought of powering driver just to keep the lights but every 4 presses it will kill the lights as the original driver powers off. Waste of current to just have that and a piggy backed Fet. Will try to use the LEDs as just the off time lighted SW button. Each LED on the K2 SW does have its own resistor and will utilize them or swap resistors into that space as needed for color choice.
Got the new Fet+1 saved in cart from MtnE with Standard Electronic Switch Firmware and LVP.
I did the K2 before Narsil, but most lights I have Narsil running in use an indicator LED, many of which are mounted with the switch, or by the switch. The K2 would be perfect for it. I think the Lumintop BLF SD10 is similar, and I'm using the switch LED with an air wired resistor:
B-158 mod part deux. I started working on the fins and spacer rings Doesn’t look like much but that’s about 5 hrs work with another hour on a different part.
Quick test on Sam 30Q's as-is, calculating lumens, I got 34,200. It's bright. The outdoor test seems to have burnt out the 7135 of the FET+1 driver. The FET is a SIR404DP, but now, turning on the light I get about the one 7135 equivalent in output, but ramping of the FET still works. Running Narsil using 2 green LED's next to the switch as the indicator LED.
16 XHP50 K2 bins, from Cutter. 22 AWG Teflon coated on the Noctigons, 3 to 1 reduction to 18 AWG wires.
Might just go with the SIR404DP FET only now. Guess a single 7135 can't take the heat for some reason...
Uhhh, good Q. Mostly only remember the brightness - it was spectacular. Can't check it now, but did have a dark spot in the middle on a white wall. Outdoors it was a super wide beam of light going upward. Too chicken to light up the block though .
Not bad for an UltraFire. I actually beat the claimed lumens of 20,000 .
Doesn’t look like much but that’s about 5 hrs work with another hour on a different part.
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