Thanks, Mark. I had forgotten about your previous post about the diode.
As I mentioned, I’m a complete beginner with drivers, and electronics in general.
I measured pin 7 of the ATtiny85 as you suggested and got 0.16V with the LED connected and lit. I measured the other pins as well, in case that could offer a clue.
ATtiny85 pin voltages with LED lit, cell at 4.0V, switch removed from circuit:
I have nothing then, as it is testing fine. Do these driver not utilize pin 7 for ADC low voltage protection? Anyone with more knowledge want to chime in?
You could do some continuity and resistance testing and see if all the resistors are intact. I know you said you did some testing, I am just not sure if you tested those.
Very nice, floody beam pattern, without any visible tint shifts. On the highest mode after 5 minutes flashlight body is warm, but not too hot to hold.
The tricky part during the build - centering ring goes flat side towards the shelf, included oring (in the set from kiriba-ru) goes under the lens, stock oring goes above the lens, under the bezel.
My mini GT was in pieces. It started with a severely unresponsive switch, and Neal asked me to find out where the problem was. So I opened the (unglued) bezel and because the centerpiece was so tight in the reflector opening, the unscrewing of the bezel twisted the led from its solder pad. So I had the mini GT in pieces with two problems now. I ordered a batch of new switches from aliexpress, which will be a separate project, but in the meantime I tried a dedomed XP-G2 S4 2B in it, recovered from a Emisar D4 in which I swapped the leds for warm white ones for a friend. The XP-G2’s seems the good old stuff. I reflowed one on the miniGT board and made a complete mess of the hot dedome (I started it too hot) lots of silicone left on top of the phosfor. So I heated the board up again, took it from the hotplate and started rubbing off the silicon from the phosfor with a wooden toothpick, trying to stay clear of the bond wires (hail my quality stereo microscope). Got most of it off with rubbing and blowing, but have some doubts if remains will shorten the lifetime of the led. Anyway, the led lives and worked surprisingly well in the miniGT, a perfect beam and 229 kcd on a 30Q at 30 seconds. Just the switch is still broken, it did not fix itself by disassembling the driver .You can see in above picture that the centerpiece tries to shear off the led again, but perhaps my reflows are stronger than Lumintop’s.
My USBasp arrived today, so I decided to take my Emisar D1 apart. Worked like a charm. Stupid thing is I’m still waiting for my SOIC8 clip. So I’ll probably order one from Amazon with evening express, cause I caaan’t waaiiiit now.