*BLF LT1 Lantern Project* (codes going out for more LT1s, second batch shipping!)

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amishbill
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thijsco19 wrote:
Sounds like coil wine, the inductor is then resonating at a high frequency.

Only solution (I think) is to replace the inductor.. (or the driver obviously)


Would locking the inductor down (or just changing its mass) with an adhesive or hot glue work to reduce the vibration?

DIY LT1 battery wrap image. "PDF on Google Drive":https://drive.google.com/open?id=1IHIEOi1NXu868IYNCzIM7D2Ulpxchmww

Fresh Sanyo NCR18650GAs already wrapped "for sale HERE":http://budgetlightforum.com/node/69120 if you like.

Flying Luminosity
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amishbill wrote:
thijsco19 wrote:
Sounds like coil wine, the inductor is then resonating at a high frequency.

Only solution (I think) is to replace the inductor.. (or the driver obviously)


Would locking the inductor down (or just changing its mass) with an adhesive or hot glue work to reduce the vibration?

I guess that potting might be a solution.

Luminosity
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maukka wrote:
With no batteries connected the buck converter on mine makes a horrible screechy noise on input voltages higher than 5V. On stepped level 2/5 it makes it at 5V as well. With batteries in and charging, there’s no noise.

Doesn’t really work for running from a 12V source without batteries then.

With a 12V input and the batteries disconnected my first batch unit does the same. Horrible squealing. So it’s probably not a bad inductor.

Wasn’t the ability to run without the batteries attached “discovered” as an accidental feature? So if this use case wasn’t designed for, it’s not really a concern for me.

It does work happily at 5V like this with no noise, so I’m considering it a bonus feature. This lantern does everything I’ve wanted for a long time. DBSAR, Lexel, TK and the team really knocked it out of the park on this one.

Luminosity
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I just flashed the anduril.2019-11-29b.blf-lantern.hex on my unit, because it went into kernel panic strobe mode more often than I cared for, and ToyKeeper said this should improve that.

But I used the Emisar pogo pin while holding another wire for the reset pin, and hitting enter on AVRDude with my third hand. Wink Needless to say that was less than fun.

Does anyone sell the HQ Universal Driver Programming Key already assembled? I don’t have a reflow oven and soldering the pogo pins to the PCB is not my kind of fun either.

I’ve googled the tar out of this and can’t find a US source for any pre-assembled Lexel driver compatible pogo key. TIA for any help!

DBSAR
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Luminosity wrote:

With a 12V input and the batteries disconnected my first batch unit does the same. Horrible squealing. So it’s probably not a bad inductor.

Wasn’t the ability to run without the batteries attached “discovered” as an accidental feature? So if this use case wasn’t designed for, it’s not really a concern for me.

It does work happily at 5V like this with no noise, so I’m considering it a bonus feature. This lantern does everything I’ve wanted for a long time. DBSAR, Lexel, TK and the team really knocked it out of the park on this one.

Yes, indeed the ability to run with no batteries was an accidental, but great usable feature. Thumbs Up The inductor begins to oscillate at high audible frequencies past 6 volts, but at the standard USB 5-volt input its silent. a low cost 12 volt to 5-volt USB adapter fixes the noise issue for anyone wanting to run it directly from 12 volts. I have test run the first production unit i bought for 5 days/24 hours non-stop on mode-3 of the stepped settings using a 5 volt USB wall adapter. it stayed quiet as a mouse. Big Smile

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

sgt253
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I have a first batch lantern. I get the inductor whine when I have tried it connected to power supply without batteries. Its completely silent on battery power though. I use it every night as a lamp alternative in my office. Works flawlessly. I have charged it fully one (1) time since I received it. Really is a fuel miser in my experience. Can’t thank the team enough! I was on the list for two lanterns. Getting my second one now with code sent by Sofirn. Awesome lanterns!

LoPan12
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If we wait, can we put off using our group buy code for when a colored version is released?

Sorry if it’s a repeat. I’ve sifted through the last hundred or two posts and didnt see an answer to the question.

Kennyboy
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Watch out with buying multiple lanterns with one code as you only get discount for first lantern. I bought two and only had the first one at group buy price. This happen to anyone else?

ImLagging
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Luminosity wrote:
I just flashed the anduril.2019-11-29b.blf-lantern.hex on my unit, because it went into kernel panic strobe mode more often than I cared for, and ToyKeeper said this should improve that.

But I used the Emisar pogo pin while holding another wire for the reset pin, and hitting enter on AVRDude with my third hand. Wink Needless to say that was less than fun.

Does anyone sell the HQ Universal Driver Programming Key already assembled? I don’t have a reflow oven and soldering the pogo pins to the PCB is not my kind of fun either.

I’ve googled the tar out of this and can’t find a US source for any pre-assembled Lexel driver compatible pogo key. TIA for any help!

I too would be interested in purchasing a pre-assembled pogo key if available.

Rexlion
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Maukka’s measurements of 355 and 463 lumens (WW and CW) sound kind of low to me; weren’t these supposed to be about 600 lumens? Sad

Old Davo
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Kennyboy wrote:
Watch out with buying multiple lanterns with one code as you only get discount for first lantern. I bought two and only had the first one at group buy price. This happen to anyone else?

Yes. It happened to me as well.
I messaged Sofirn and explained that and he said it was an error with their code. He has sent me a new code.
My advice is to message Sofirn back directly.

seven7seven
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I received my first code and ordered 1 lantern.

Am I correct that I must wait for a 2nd code to order the rest of mine?

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Rexlion wrote:
Maukka’s measurements of 355 and 463 lumens (WW and CW) sound kind of low to me; weren’t these supposed to be about 600 lumens? Sad

I’ve suspected for quite a while that 600 was probably too high. It’s pretty common for amc7135-based drivers to get around 100 lm/W when using medium-CRI LEDs like XP-L HI, and this efficiency goes down when using high-CRI LEDs.

If I understand correctly, my prototype was made before the correct LEDs were sourced, and it probably gets near that common 100 lm/W level. Using some quick napkin math, this would make it…

  • 350 mA * 5 * 3.6 V * 95 lm/W = 598 lm

… which is pretty close to the estimated value of 600 lm.

But with high-CRI LEDs it should be lower. Let’s say 75 lm/W…

  • 350 mA * 5 * 3.6 V * 75 lm/W = 472 lm

… and that’s pretty close to maukka’s measurement of 463 lm.

I think the output was going to be increased by using a somewhat less-opaque diffuser, but for some reason the factory went with a diffuser which was more white and less clear. So the beam is really smooth, but it reduces the total output a bit.

Efficiency could be increased by using a boost or buck driver instead of a linear driver, but that wasn’t within the scope of the project. It’s mostly just an idea for next time, if there is a next time.

RollerBoySE
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463 lm is more than enough for a lantern.
A pleasent high CRI is MUCH more important.

Kame Sennin
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Could someone point me to the driver schematic please ? I am sure i have seen it somewhere (but maybe that wasn't the latest version) but can't find it anymore

thijsco19
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Flying Luminosity wrote:
amishbill wrote:
thijsco19 wrote:
Sounds like coil wine, the inductor is then resonating at a high frequency.

Only solution (I think) is to replace the inductor.. (or the driver obviously)


Would locking the inductor down (or just changing its mass) with an adhesive or hot glue work to reduce the vibration?

I guess that potting might be a solution.

Probably, depends on the inductor used.
I think only the ‘open type’ can be glued or potted to stop coil wine. The ‘box’ one’s probably not.
However it’s worth a try ;).

‘Open’ type :

‘Box type’

I’m not a elektro technical guy though.

thijsco19
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Just received my lantern! Ordered from amazon.de on november 16 and shipped november 30 according to the tracking details.

Heavier than expected but that’s not a problem for me.
Look and feel is great! Really happy with it. Probably not going to use it in a real camping situation but you will never know :).

The light is nice warm on the warm side, a bit too cold on the cold side. it looks more like 6000K than 5000K to me.
I think I will solder the bridge for all the AMC’s to increase brightness.

h5550
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Just received my lantern.
Ordered 23/11
Shipped 30/11
Received 4/12

Amazon.de. Cool

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thijsco19 wrote:

I think I will solder the bridge for all the AMC’s to increase brightness.

No harm in doing that, but just a reminder its easy to make the connection with the pencil trick, and even easier to remove the connection if you wish.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

LoPan12
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sbslider wrote:
thijsco19 wrote:
I think I will solder the bridge for all the AMC’s to increase brightness.
No harm in doing that, but just a reminder its easy to make the connection with the pencil trick, and even easier to remove the connection if you wish.

Still surprised this works… So the contacts we’re bridging just control the 7135 chips, not carry any current I guess?

sbslider
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LoPan12 wrote:
sbslider wrote:
thijsco19 wrote:
I think I will solder the bridge for all the AMC’s to increase brightness.
No harm in doing that, but just a reminder its easy to make the connection with the pencil trick, and even easier to remove the connection if you wish.

Still surprised this works… So the contacts we’re bridging just control the 7135 chips, not carry any current I guess?


Yes, the lines that are open are the control lines for the 7135s. I was surprised it worked also.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

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I soldered mine as well. Makes quite a noticeable difference. Went from bright to almost to bright to look directly at.

leftdisconnected
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goshdogit wrote:
My folding silicone bowls arrived today. I got one white and one yellow from this eBay listing. Shipping was 30 days to the US.

This source seems half the price of one on AliExpress, so thanks. I’m going to order one or two.

RobAllen

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I’m not trying to speak for Sofirn, but I think we need to let people know that the group buy is for Black LT1’s only and was never truly intended to be for colored versions. Sofirn can do whatever it wants and it doesn’t hurt to ask (once), but there seem to be many people who joined the group buy, but who now want to save their code for the colored versions.

At present, Sofirn has NO IDEA when it will be able to get colored production LT1’s, so please consider your GB codes limited to the Black version.

There will undoubtedly be tons of discount codes on future colored LT1’s when they become available. You don’t have to use your discount codes now, but you might not be able to save them for a future product that has no timeline. Even though Sofirn intended to offer colored lanterns to the Group Buy list, they announced that their anodizing company was unable to fulfil these requests for now.

DBSAR had asked Sofirn about offering a bare metal option instead, but we’ve heard nothing further about that option in this thread.

RobAllen

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leftdisconnected wrote:
You don’t have to use your discount codes now, but you cannot save them for a future product that has no timeline!

I suspect that most that were on the list for just one LT1 have conceded the fact that Sofrin will not offer the ‘color option’ anytime soon and have gone ahead and ordered a black one, however I think many that are on the list for more than one, after ordering one will hold off ordering additional multiple black ones thinking the color option will be available eventually. I understood from what I was told in a message from Sofrin………. if we are willing to wait, that our place on the list would be honored and new codes will be sent out WHEN the colors are available, which I feel is inevitable because of the demand …….
whether they keep their ‘word’ and stick to this game plan is another matter. It is also possible that Sofrin might simply want to sell all the black ones before moving to selling ‘only colors’….. its hard to say for sure when money is involved.

Im not a Pessimist …. just an Optimist with a lot of experience

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I have some magnetic trays from Harbor Freight that might be useful as a shade or a base.
The magnet is a doughnut shape in the center so a >1/4” hole could be drilled to allow a thumbscrew to hold it to the tray.
Something sneaky could be worked out to make it stay on the top as a shade.

Harbor Freight Parts Holder

f0xx
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Luminosity wrote:
I just flashed the anduril.2019-11-29b.blf-lantern.hex on my unit, because it went into kernel panic strobe mode more often than I cared for, and ToyKeeper said this should improve that.

But I used the Emisar pogo pin while holding another wire for the reset pin, and hitting enter on AVRDude with my third hand. Wink Needless to say that was less than fun.

Does anyone sell the HQ Universal Driver Programming Key already assembled? I don’t have a reflow oven and soldering the pogo pins to the PCB is not my kind of fun either.

I’ve googled the tar out of this and can’t find a US source for any pre-assembled Lexel driver compatible pogo key. TIA for any help!

Alternatively, you could pull the driver and use an SOIC8 clip directly on the MCU. I haven’t tried to put my programming keys together yet, but I’m anticipating some frustration when the time comes.

southland
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Have several codes just over 2 weeks old that are already expired.

Flying Luminosity
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Mine is due to be delivered today, so for people in the UK that means delivery should take roughly 3 weeks. In my case it’s been 20 days since I ordered the LT1 on 26/11.

whitecitadel
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Flying Luminosity wrote:
Mine is due to be delivered today, so for people in the UK that means delivery should take roughly 3 weeks. In my case it’s been 20 days since I ordered the LT1 on 26/11.

Its a useful reference but its pretty random still depending on when/where you ordered – was that eBay, Amazon, Aliexpress?

I ordered 11/11 from Ali because at the time I don’t think I had my code yet on PM and it was the same as the group buy price with offers and codes, mine is still floating out there somewhere, the tracking did not work for over 2 weeks (not recognized) so there may have been just a problem or it may have been a “bit slow”(tm) to ship despite being assigned a tracking number.

Suspect be another week or two yet because usually its 3 weeks once the tracking shows signs of anything on 17track etc.

DBSar you totally earnt the 10K post… Big Smile

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