GT mini~reflash the latest firmware~

LED Flashlights – General Info 18650 Flashlights
1

Please forgive me through Google Translate

GT’s long-range ability is super strong, and it is deeply praised by users!
However, if XHP70.2 is installed, it can fully exert its full strength.
So, should there be a GT 70?

Recently launched a reduced version of the GT mini
Use 18650 battery, XP-L Hi LED, and inherit the easy-to-use NarsilM interface

It is said that
Smaller GT micro, using AAA, 10400 batteries
Really blowing up for a while GT crazy

Brothers come first to recognize each other

GT mini is very delicate and beautiful carton packaging

Big brother asked, must take another photo

what? … more…

Drawer packaging

inner box

18350 adapter
I don’t know if there will be official shipments? Will there be spare parts, hand ropes, etc.

positive

back

Brother photo

Big head and small head

CREE XP-L Hi

18350 plain transfer tube

Single photo

Because i want to change the final decision firmware
Start to dismantle…

The circuit is FET+1 (7135), and the switch is on the circuit.

FET model

Positive electrode on the back of the circuit, thermoelectric separation copper substrate

Tail cap double spring

Tail cover rope hole

trademark

model

Rectangular thread

Body thickness

Side button, metal outer ring interference fit, do not dare to dismantle

Inside of the button

There is a green LED below the button

smile

Reflash the final firmware

Reflash successfully

Test and then install

18650GA(10A) Turbo

Highlight (Ramp brightest)

VTC6 (30A) Turbo

Highlight (Ramp brightest)

Photo wall, concentrated light

Thanks for watching

(prototype) the GT Mini
(prototype) the GT Mini
E-switch UI Development / FSM
2

wow amazing photos, i really like the box looks good better then blf gt bigger brother :smiley: nice job steel!

3

well done my friend!

4

Very nice! Thank you for the glimpse at the driver. :+1:

5

Nice!
Is it hard to get the driver out? How much glue?

6

My GT mini has no glue.

The driver must be pressed with the barrel.

Replace the battery from the rear.

7

Sorry but FET+1 driver ?! I thought Lumintop went for a regulated 4,5A buck driver ?

8

Yeah, came here to ask this question. The manual that was published indicated a regulated buck driver. I know at least one person who was interested in the light in part because they wanted to swap in a de-domed Nichia 219D. The low V_f of the 219D would play very nicely with a buck driver, but not with a FET+1. Not only that, but a FET+1 kinda seems boring at this point, making it too similar to the Emisar D1S and Astrolux C8. A well-designed buck driver would have been a nice differentiating feature in a rather crowded category.

9

Also wondering about the driver change from the manual…

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you can read the latest documents here:
GTmini user manual & NarsilM CheatSheet GTmini

i try to find out why a "buck driver" is mentioned in the manual

OSRAM CSLNM1.TG & CULNM1.TG 1mm², CSLPM1.TG & CULPM1.TG 2mm²
11

So which is it?

12

Is yours a special preproduction unit? You always get things before everyone else. I’m hoping there’s no glue for the shipping version too.

Thanks for the great photos as usual!

13

Because its an error in the manual.

14

nice to see the actual flash process, thanks for the steps/pictures.

15

The driver is a FET+1 design. A buck driver was considered but it would limit the output greatly with the XP-L HI LED.

I have yet to see a China buck driver for a single cell light that was in regulation for more then a few minutes. Usually they drop out of regulation almost instantly. Rendering the entire point of a buck drive moot except for low modes.

The manual was copied from the normal GT and the buck part just slipped through and was not put in there intensionally.

(prototype) the GT Mini
(prototype) the GT Mini
16

Yeah; a buck would really limit it with the high vf of the xpl hi, but it was the only real reason for me to get this light: the potential to soon put something with a Vf too low for a fet+1. If it’s going to be so similar to the d1s, I’d rather go with that. Besides, I have a thing about when, after lots of people’s money has already changed hands, things turn out to not be as they were described. (In the manual, in this case.)

17

Of course almost all buck drivers fail to regulate using only an 18650 at turbo outputs for more than a few minutes, especially with an XPL HI.

To maximize runtime with buck drivers, you need to either bypass the spring/use a copper alloy spring, use a high drain high capacity battery such as a 30Q, minimize voltage drops in the buck driver itself, and etc.

An XPL2 HI would also help. Or maybe a E21A.

TLDR: Unless you go with a 2S setup, maximizing buck driver efficiency and voltage delta is crucial.

18

If performance on turbo was all that mattered, almost no one would care at all about regulated drivers in 1s lights.

And yet, some guy, goes by the username Texas_Ace, created a really nice family of drivers with two channels of (linear)regulation and turbo.

19

Is this the first time this has been shared publicly?

20

Thanks for the review and update steel. :beer: