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

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The Miller
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Haven’t thought about it.
If it means people wanting a specific number or have it match their number on the list I think it will not be doable Wink
However for showing the original groupbuy GT apart from the rest might be nice, heck would be cool if they serial number all and we can see how high of a number is reached, would be cool to see a review in a couple of years with number 2345 for example heheh

kaybi
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I don’t feel like specific numbers, or matching, would be necessary. I would be happy if you guys (the development team) could get the first few numbers, too. You all deserve it after so much work.

teacher
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Or to spare the problems associated with individual serial numbers on the group buy… just do the gb lights “1/555”. (1 of 555)

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The Miller
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Well 0,0018 , 0,0036 and so on are strangely small serial numbers I’d say Big Smile
No I get you and that would indeed be the way to go Wink

JM87
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Is there any spots left available? If so I would like to be put on the list.

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The Miller wrote:
Haven't thought about it. If it means people wanting a specific number or have it match their number on the list I think it will not be doable Wink However for showing the original groupbuy GT apart from the rest might be nice, heck would be cool if they serial number all and we can see how high of a number is reached, would be cool to see a review in a couple of years with number 2345 for example heheh

 

That would be awesome The Miller. Thanks by the way to all the people that made the BLF GT possible. Thanks to Lumintop as well. I bet it would be a quality flashlight like what they manufacture.

teacher
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teacher wrote:
Or to spare the problems associated with individual serial numbers on the group buy… just do the gb lights “1/555”. (1 of 555)
The Miller wrote:
Well 0,0018 , 0,0036 and so on are strangely small serial numbers I’d say Big Smile
No I get you and that would indeed be the way to go Wink
Yeah, by “problems” I meant the tremendous amount of work associated with getting people specific serial numbers. Having each light in the group buy numbered the same would solve that headache. Big Smile
Seems you read my mind though….. Beer

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

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Mr.Scott
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teacher wrote:
teacher wrote:
Or to spare the problems associated with individual serial numbers on the group buy… just do the gb lights “1/555”. (1 of 555)
Having each light in the group buy numbered the same would solve that headache. Big Smile

So we would all get a light numbered “1/555”. Cool. Wink

kaybi
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Is it a serial number if everyone has the same one? No it isn’t. I think that defeats the point, honestly.

Id rather have no number at all, than everyone sharing the same number.

I’d make a vote. If people are OK with getting a random number (as long as it is inside 555?) then we could make the serial numbers happen. If people will make a fuzz about getting a specific number, I would prefer to drop the matter entirely.

JM87
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Can you at me to the back up list if there is any spots left?

The Miller
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Yes will update the core list tonight, and it is time for a lists updat as well, got the updates from mr.Scott from the last core update so that should give a better idea where we are at.

Pulsar
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I could really care less either way.

If we were doing serial numbers, I think 1 of 555 – 2 of 555 – 3 of 555 would be cool for this run. Then 00556 – 00557 – 00558
Or maybe just put “First run” on this batch, or “1 of 555” on all of the first batch…

And, I dont really care if there is no serial or special markings on it. Would be a neat extra, but does it really add to the light? To be honest, I am on the list for one and would like to honor that, but depending on the final price and time of release, I may not even be able to afford to jump on it… times are tough in the Pulsar household. So my opinion may not matter

The Miller
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All opinions matter Wink

Yes if we do serials it is gonna be “ 001 of 555 “ and so on
Nobody will be able to choose a number they will be send random

Good news, DEL made the first driver prototype
It works at 2,24A with good 90+% efficiency
Parasitic drain is acceptable at 156uA and possibly a bit lower.
Heck of first proto driver results!

mrheosuper
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Good to hear that, the runtime will be very long
Btw: i love the idea engraving the number on the light, it will be more valuable in my collection

Forgot my pen

The Miller
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MARK core list updated

JM87
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Thanks. Cant wait for it to be finished.

patmet
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I’m in for one piece of this great flashlight!

keengeorge
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kaybi wrote:
Is it a serial number if everyone has the same one? No it isn’t. I think that defeats the point, honestly.

Id rather have no number at all, than everyone sharing the same number.

I’d make a vote. If people are OK with getting a random number (as long as it is inside 555?) then we could make the serial numbers happen. If people will make a fuzz about getting a specific number, I would prefer to drop the matter entirely.

+1,000,000 smile wink

KawiBoy1428
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Good news, DEL made the first driver prototype
It works at 2,24A with good 90+% efficiency

Parasitic drain is acceptable at 156uA and possibly a bit lower.

Wow this is pretty freak’n awesomely excellent !!!! Wink

Great work DEL!!! Thumbs Up

KB1428 “Live Life WOT

giorgoskok
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Man , i can’t wait to get one Smile

DEL
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As The Miller mentioned, the prototype driver is built and mostly tested. It is running a tweaked version of Tom’s NarsilM and it has been performing pretty well.

Some numbers:

  • Switching frequency is at 800 kHz with the selected components and at 16.8 V input.
  • 100% output is 2.25 A, but this easily adjusted by changing Rsense. Aim is to have >= 2.5 A stock.
  • Everything is running cool. ‘Hottest’ components are the buck chip and 100 mohm sense resistor, and both have a Trise of barely 20 C.
  • Efficiency is 91% at 16.8 V, peaking at around 93% as the battery voltage approaches the output voltage.
  • With my ‘LED load’ (4 × 3 V emitters on a beefy heat sink), it stays in regulation down to about 13.8 V (3.45 V per cell). An actual XHP35 should do better.
  • As the battery drains further the LED current fades gracefully. About 2 A left at 13 V, 0.8 A at 12 V.
  • Parasitic drain is 156 uA. The bulk of this is the buck chip, unfortunately. Will bring it down to about 125 uA by upping the LVP resistors.
  • The firmware has been set to get pure analog dimming between 100% and 20%. From there it is further dimmed using 15.6 kHz PWM. Butter-smooth Narsil ramping! (The 20% analog dimming limit is not set in stone, but some efficiency is sacrificed if trying to go much lower.)
  • Getting a moon mode of 0.44 mA, using a combination of analog and PWM dimming.

kaybi
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Beautiful, DEL. Do you think a lot of efficiency will be lost by pushing the components to 2.5A? What about longevity?

Is it just me, or did the project get a much faster pace in the last few weeks?

MRsDNF
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Orsm work DEL. Thumbs Up

 

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That is one nice looking driver Smile

KawiBoy1428
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That’s a beauty DEL, remarkable work! Beer

The heat form this driver should be a non issue in the massive light! Thumbs Up

KB1428 “Live Life WOT

DOHC20
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hey im interested, can you put me down for one.
dont want to sound impatient but how long before its going to be available. Or even see a working prototype to be able to get real world figures and outputs from?

Enderman
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I wish there was a buck driver like this that could do 12A+ Sad

The Miller
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NICE DEL!
beautifull driver for sure!
And awesome how you write stuff like: “but this easily adjusted by changing Rsense” and “Will bring it down to about 125 uA by upping the LVP resistors.” it’s like magic and you’re a grand wizard for sure!

Will update list later

DEL
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Thanks for the kind words everyone!

Regarding capacity, the design is very conservative and it should be able to run 5 A with minor modifications. Doing that will have some components run pretty hot though.

2.5 A is only a 10% bump from where we are now and is not an issue. Only reason I am at 2.25 A is the availability of good current sense resistors. Would have been nice to stick with 0.1 ohm.

Texas_Ace
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Very nice driver setup there. Only thing I could see to improve it would be a 1617 mcu.

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