[PART 1] Official BLF GT Group Buy thread. Group buy officially closed! Lights shipping.

Not 1s, but could it drive a 3v led with 3s batteries?

Pretty sure the BOSS1 is standard SRK size, but can't find the diameter in my notes:

I hit over one mile on mine, dedomed XPL (696 kcd), but later with focusing hit ~720 kcd.

Hey, what about 2S? Could this driver do that into a ~6V emitter? Or is it good for 4S only? I’m thinking about a SRK with 18350’s stacked inside, feeding some XHP-50’s or something like that. Then, there’s no need to re-arrange the battery tube.

Boss1 has 4 x 26650, thats not SRK Size.

Of course, but not sure bout the driver size - can measure it later.

I know the Boss1 is different but maybe it fits to place this driver above the original empted driver, with modding to make it 4S and a XHP35HI would make a nice light.

As a test platform for those up for it.
But maybe after the first test on the bench are done somebody can adapt the GT driver so that it fits in a TN42. A DEL Ton E designed Narsil driven TN42 sounds pretty sweet.

I dont know if there is enough space for it. There is realy verry less space between driver and shelf.

German Palight BOSS1 - XHP35HI - 2,5A | Taschenlampen Forum
English Palight BOSS1 - XHP35HI - 2,5A | Taschenlampen Forum

German Review Palight Boss1 (XM-L2, 1 - 4x 26650) | Taschenlampen Forum
English: Review Palight Boss1 (XM-L2, 1 - 4x 26650) | Taschenlampen Forum

Here is a A17DD_L on top of the standard-driver. But the pictures are not aviable without account:
German http://www.taschenlampen-forum.de/threads/vorstellung-palight-boss1-goes-xm-l2-dd-warmweiß-a17dd_l.49315/

I am not sure what components were selected but the buck IC itself can drive any combo of input and output voltage as long as the output is less then the input. Just a matter of what components are installed on the driver.

I had wanted to do a buck driver when this project started but no one was offering to help with the EE of it at the time. So the only option was the Texas buck which was not an option due to cost.

I have been watching this from the start and tried my hardest to resist but I give in.
Please add me to the list.
Thank you.

As TA said, the driver should work in any arrangement where the battery voltage is sufficiently higher than the emitter(s) voltage. That said, efficiency suffers when going to the extreme, like 4S battery to 3 V emitter. This is just a fact of life for (non-synchronous) buck convertors.

3S to 6 V emitter(s) will be a pretty nice setup.
2S to 3 V should be fine.
2S to 6 V will probably not stay in regulation for very long.

With the current components, the driver will not work in a 1S setup. It could be made to work with a few component changes, but it will drop out of regulation too fast.

This light is huge. For me maybe it will be a shelf queen, and pretty expensive for me. My most expensive light was the Convoy L6. I almost asked to remove me from list but it is so unique that I can not miss this so I’m staying on the list and wait :smiley:

Heheh you never know
Having 1 S70 I thought no more power was needed
Now a S70s at front door (when night falls I turn it on standby so the lighted switch shines reassuring)
A L6 at back door ground level
A TN42 at back door first floor
A S70 near back door first floor

I tend to use the most powerful
So well just know it will be the GT and Q8 at back door first floor and then the TN42 will be placed at front door besides the S70s.

Yesterday viewed google maps and measured distances in my area about what far things going to fit the GT range from higher places. And I was simply amazed by that. My best thrower was the L2 dedomed with 1048m throw. I thought that was far. :person_facepalming:

mark
list updated!

I guess the largest issue is that this driver will only really work for the GT as it doesn’t have the cell setup to allow it to be modded to 2s or 4s input from a SRK. At least the road has been paved and a SRK / Q8 version should not be that hard to make.

I would love to see this driver in a Q8 with an 841 or 1617 MCU and firmware upgrades to match and the LED’s run ins series.

This flashlight is ridiculous, I’m in!

+1 I'm borderline giddy with the idea of using a 1617...

16 KB, 12-22 I/O pins: http://www.microchip.com ATTINY1617, http://ww1.microchip.com 1617 specs

95 cents: https://www.digikey.com ATTINY1617

Please put me on the list.

Please add me for one if there is still room on the list. Many thanks.

Have you seen this Tom?

Its a boost driver but a buck uses the same components in a different layout, programming would be kind of similar. Wikipedia does a pretty good job of covering the different types of converters if someone is not familiar with them.

Components need optimizing and you could use a hall effect current sensor for output feedback(Change in current=change in voltage signal, both are electrically isolated). It would keep more noise away from the controller and the schottky diode could be replaced with a FET for more current control and less power loss. Make it Narsil based and the output modes feed the converter with a feedback loop instead of the PWM outputs. You could do more than one channel with all those pins. If you stagger the FET firing sequence it would cut down on ripple and allow a smaller output capacitor. The inductors could be different sizes, shut the big one off for low modes. The PWM would still be high on the small inductor so flickering would be less noticeable on moon.

How hard would it be to program something like this? Could a determined newb do it?