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Running 2 tri cree off one NBv3

TOPIC: Running 2 tri cree off one NBv3

Running 2 tri cree off one NBv3 1 month 1 week ago #75694

Darth Squidious Offline Premium Member Posts: 128 Thank you received: 50	So, I got my renegades in and did the install with two rB/R/W tri crees running on one NBv3. After a few snafus everything is working fine and I have a nice purple with a white FoC. However the second LED seems dimmer than the first. Its minor but noticeable, am I pushing my 18650 too hard?
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Running 2 tri cree off one NBv3 1 month 1 week ago #75695

KelbornX Online Platinum Member Peace is a lie... Posts: 463 Thank you received: 220	I think you're pushing the board too hard. It's only rated for 2A iirc.
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Running 2 tri cree off one NBv3 1 month 1 week ago #75698

Darth Squidious Offline Premium Member Posts: 128 Thank you received: 50	You really think so? I've run a cross guard saber with an NBv3 without an issue.
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Running 2 tri cree off one NBv3 1 month 1 week ago #75701

Jas-Ot
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It depends on the amount of voltage going to the LEDs as to the actual draw, but you're limited to 2A on the main channel. Not 100% sure since I'm not looking at the manual right now, but I believe the FOC pad is 1.5a

Now, that's what the board is rated at, it might allow 2.5A or even 3A through. You'd need a multimeter or bench PSU to test. regardless, you're likely hitting a limit on the amount of current you can draw which is causing dimness.

Other possible issues could include the length of wire (adds resistance), mis matched LEDs (might have a low binned LED), over zealous resistor, bad solder joint, and others I can't think of

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Running 2 tri cree off one NBv3 1 month 1 week ago #75708

Darth Squidious Offline Premium Member Posts: 128 Thank you received: 50	I'll try shortening the wire to blade 2 and see what happens. Worst case I'll save up and snag a couple of NBv4s, for now its still a working and good looking saber.
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Running 2 tri cree off one NBv3 1 month 1 week ago #75714

Kouri Offline Platinum Member Posts: 874 Thank you received: 608	Contrary to the manual, pretty sure the NBv3 mosfets can handle 4.5A+ limit, so that should be fine. My vote's on it being a natural variance between the two LEDs.
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Running 2 tri cree off one NBv3 1 month 1 week ago #75720

RotundChap Offline Premium Member Posts: 142 Thank you received: 41	Kouri wrote: My vote's on it being a natural variance between the two LEDs. That's my bet, too. Are any of the dyes on the 2nd LED resistored?
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Running 2 tri cree off one NBv3 1 month 1 week ago #75721

Darth Squidious Offline Premium Member Posts: 128 Thank you received: 50	The red is resistored on both LEDs.
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Running 2 tri cree off one NBv3 1 month 6 days ago #75737

Jas-Ot Offline Platinum Member Posts: 954 Thank you received: 268	What resistors are you using? Is that second led in series behind the other one? As in, is the wiring to the second led straight from the board, or does it come off the first LED?
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Running 2 tri cree off one NBv3 1 month 6 days ago #75738

Darth Squidious Offline Premium Member Posts: 128 Thank you received: 50	All LEDs are wired straight to the board with reds resistored with a 2 ohm 1 w I believe but I Might have that backwards.
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Running 2 tri cree off one NBv3 1 month 6 days ago #75740

Jas-Ot Offline Platinum Member Posts: 954 Thank you received: 268	I hope you have that backwards, lol. hrmm, might just be a variance between the LEDs. wired directly to the board I would think both would be dimmer is it was an amperage issue through the board.
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Running 2 tri cree off one NBv3 1 month 6 days ago #75742

Darth Squidious Offline Premium Member Posts: 128 Thank you received: 50	I do indeed have that backwards: 1ohm 2w. Are you saying I might get better results if I bridged the diodes?
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Running 2 tri cree off one NBv3 1 month 6 days ago #75743

Jas-Ot Offline Platinum Member Posts: 954 Thank you received: 268	No, don't run them in serial, won't work. I'm saying you may have variances in the LEDs.
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