Smallest 3 x XML U2 flashlight mod with Small Sun ZY-A 623 ( 3 x 2,5 A with 7135 powerpacks selve-made )


This is my new baby, so small and bright!

Only 14,5 × 3,7 cm, full regulated with max. 3 × 2,5A, 3 mode, with new self-made 7135 powerpacks!

Here some pictures from the build:








Holy crap, those guts look gorgeous!
That’s a pure floodlight, I guess?

Nice! A triple xm-l that runs off of 1 18650. Now that is a pocket rocket.

Yes it is, because of the very small reflector http://www.fancyflashlights.com/goods.php?id=65
but i like it!

That is awsome. Must be a blast to use :slight_smile:
I just dont get how you managed to pull 3 x 3,7V*2,5A off what looks to be a nanjg 105C.
Would you care to elaborate a bit please?

I use one Masterdriver with 7 x 7135 chips and made 2 powerpacks with each 7 x 7135 chips!
(I glued them before i solder it with Arctic silver thermo glue) The master driver control the slave powerpacks!
It runs with one IMR 18650 battery!

Wow. Superb. Can you elaborate how you mount those LEDs directly onto alu pill please? That's the most interesting part :)

And did you measure real tailcap 7.5A (or 8.8A considering 85% efficiency) from single 18650? What battery did you use?

Pulsar, current efficiency is 100% with linear AMC7135-based drivers, current is same at tailcap and LEDs, only voltage is different.

These are 8mm PCB from illumination supply : https://illuminationsupply.com/datiled-8mm-xml-mcpcb-p-67.html?zenid=c91b86caf58ee49ec174b41f5643f205

It is an AW IMR 18650 1800mAh battery

I measure at the tailcap 6,5 A , but it is difficult to measure such high Amps with this low Voltage exactly!

daysoft, thought of using LG’s 4.35V cells?
They seem superior to AW IMR’s at 5A draw, so I guess at 7A they’d be better too:

Will they do this high current?

Most likely yes, their recommended max. discharge is 6A but 7.5A is just 25% more than that.

Where can i get them cheap, any idea?

They are on eBay, $20 for 2-pack or $53 for 6-pack.
But they are only better than AW IMR’s if you use 4.35V-capable charger!

Negligible current used by the MCU? I suppose so, since we're talking large amps here... :) Thanks for the clarification.

It’s very negligible, something like 0.03A or even less than that.