Yes, the vias are completely filled with solder. Yes, I realize that this is potentially very dangerous. On most boards when the LEDs get too hot they tend to float off the board, shutting things off. Here they may float but there's nowhere to go and they may end up creating a short circuit instead. A short circuit with a high drain cell is not something you want to see!
I ordered scaru's scaryboard as well :evil: , a good way of getting rid of all the 1st gen. XML's leftover from swaps :-)
What are you guys going to do with them?
All that heat in 20mm. On fr4. :~
I have the desire to place a large via or two under each xml thermal pad so that a short piece of solid core copper wire could be placed through there.
In my build it will be less than 1A / led, it will be an efficient light :-) .
I want to crank it up and toast marshmallows over it! :bigsmile:
Are you concerns about heat with it? Does it have via’s under the center pads that you filled with something (copper wire/solder)? Is it 20mm? Looks awesome. Edit: question answered, didn’t see the next page after your post.
Is that an NCR18650BD back there? Any plans to add those to your store? I’d like to get a couple but after a disappointingly long wait on a set of NCR18650PF’s from FT (still waiting @ 38 business days) I don’t think I’ll be ordering any more batteries from over there.
http://oshpark.com/shared_projects/H7WGuYpM
Thanks Mattaus! it took very own!
please put on the front page! perhaps with cart DigiKey!
you are great guys!
Of course I'm concerned with heat! I think that I'm going to go the reasonable route and keep it around 6A...should be very efficient and not as crazy. Direct drive I think it would pull around 18-20A from a single 18650, way too much heat for that board and especially for a small 18650 tube light, even with a perfect thermal path. There are vias under each of the emitters which I filled with excess solder paste when I reflowed then smoothed off the excess on the underside after I was done.
Those cells are 2900mAh NCR18650s I bought from Wallbuys last year. The cells are decent but the protection circuits aren't so hot. I bought four of them and two of them trip with anything over 4A, the other two will do a hair over 5A before tripping...I know that at least two of them will run down to 2.5v resting without tripping the protection circuit. My son left my headlamp on for about 12 hours with two of them in there, when I found it the light was barely glowing. After about an hour each of the cells measured around 2.5v.
What is the max current the different Oshpark boards can handle? Are they able to handle up towards 30A?
0:)
I have no idea, but thermally the 70N02 may be getting close to the limit at 30A, it is only rated for 31A continuous at 4.5V. If I were trying to run 30A I would not run the Led+ through the driver, instead running it directly from the battery. You would also need some serious wires, springs, etc. to handle over 30A.
Maybe put the emitter in a jar of mineral oil. In the center of the jar the heated oil will rise and make a thermal current to cool off the bundle of emitters. You could make a really nice camping lantern with that and a mayonnaise jar.
did i hear my name? i’m happy to answer questions about my boards if there are any. wish i found BLF earlier, you guys seem to be way more into diy than some other light forums i’ve been on…
welcome to the best flashlight forum on the internet 
Hi tterev3, I generally would like to have the creators knowledge and approval before adding links to the op even though these are already posted as shared at Oshpark. That’s not always possible but glad to see you’ve registered so you can officially give your approval.
Antoninodattola, is that a board Mattaus designed for you? If so, then great. If not, then I’d like to wait on his input in case it’s for someone’s pet project.
Hi Rufusbduck, go ahead and add mine. Here are the links and some other info on my blog (where schematics, source, etc. can be found):
MELD1: OSH Park ~
Everett's projects: MELD v1 boards and Olight S10
MELD 2: main board: OSH Park ~
SEPIC daughter: OSH Park ~
LED board: OSH Park ~
Everett's projects: MELD v2
and here’s another that’s not on OSHpark (i did it before they existed) but I’ve seen a few 4x7135 boards on this thread that would work with my code so i think it might be relevant: Everett's projects: Super RGBWUV flashlights
thanks for organizing this thread!
Hey tterev3! Welcome!
I was wondering where you sourced the UV leds you’ve used.
It seems the MELD will get a UV LED that fits on cree XQ pads. On the Super RGBWUV, might that be a “3535” UV led that fits cree XP pads?
Unfortunately uv tends to be really expensive. I’ve been fortunate enough to be able to use some R&D parts for most of my projects but if I have to buy them the luxeon UV is a pretty good part, very high power. It will fit the Cree xq pad that I have on the led board
Are the issues with Meld V1 enough to advise against ordering it or are both versions good to go?
Welcome tterev3…there are a BUNCH of absolute geniuses and artists here (I’m just the cheerleader 
), I stumbled across your build and video’s and about tripped on myself trying to find someone to invite you here to enter into the fray…with your expertise added to the pool…there is NOTHING you guys can’t whip up! I’m 100% positive on that!
tterev3, I just watched the videos- Very cool. Do you sell or have you considered selling some of your drivers?