GFS16 - Battery Indicator Tailcap Light & 1mR FET Tailswitch! (Rev B)

Flashlight Modding and DIY Parts
39

I have made a new enhanced version

2x3 colors above first shut down
1 single LED for low battery signal

28uA 2.8V LDO up to 5.5V
dual pad for a 10V LDO for 2S lights
capacitors for LDO

2.8uA comparator without reference voltage, significantly reduced standby drain
the reference voltage comes from the 2.8V regulator and a voltage divider

added for each comparator a hysteresis voltage divider, so a larger bleeder like 470 or 1000 Ohms should be possible

17/20mm version

20mm with trimmers for LED brightness

40

Wow… awesome job Lexel! Did you just design this in the past 24 HR :+1: !? Well when is this gonna be available to buy?

41

Lexel is from a different planet somewhere distant in the universe, the life forms from over there work at a much faster clock rate than we humans.

42

Apologies if I missed it, but where did you get the stainless steel switch?

43

If your referring to the switch on page 1 of this thread…, they come with the flashlight, I think they are standard on the red and clear anodized s2+.

44

If, like me, you have one of the S2+ lights with a black metal switch you can buy the stainless metal switches from Banggood and the light will shine through the clear gasket (barely). So my Tan/Sand colored S2+ has a stainless metal switch I replaced and then added a lighted switch to.

45

Yeah that is the switch, do you have a link on Banggood?

46

https://www.banggood.com/Convoy-Metal-Clicky-Switch-DIY-For-S2-RedGreenBlueSilverSand-p-1161437.html?rmmds=search&cur_warehouse=CN

It only works on the ones already threaded for a metal switch though.

47

Thanks!

48

So Lexel, are you going to have these switches available for purchase?

49

Yes… where’s the group buy on these switches? I need at least 10!!! :heart_eyes:

Fully preassembled please!!! :stuck_out_tongue: :stuck_out_tongue:

50

That’s awesome Lexel. Are you planning to sell these?

51

Will the FET switches also fit in the tailcap of a Convoy C8 v2? Does anybody know how that lights tailcap compard to the one of the S2+?

52

Convoy C8 v2? Do you mean the new Convoy C8+? if that what you meant… I should have one arriving in few days, I’ll check and let you know.

53

I meant this one , not the plus-version.

54

Just checked with FET switch alone and FET switch + lighted pcb and they all it fit perfectly.

55

Thank you! Great to know!

This means mine will go in this light from kiriba-ru which uses the body tube of the C8:

56

Cool, let me know how that works for you,

Has anyone else used this FET switch, they seem not to last more than 2 weeks before they stop working… for some reason the coin cell just craps out. ill Raise R1 value to 4-5kohms to slow down the charging current and see what happens.

57

The charging current should be fine. But maybe the discharge current stresses the cell too much. The maximum continuous discharge current is 0.1mA.
Try increasing R2, by a lot.

58

I thought about that as well… but the weird thing is that they just die on there own, the light would be sitting unused for a week with a fully charged 18650 in it, than the next thing I know when I try using it is its dead, the coin cell voltage is at 0. anyway I have some more boards on order, ill increase R2 like you said and see how that effects the battery and the FET gate.