I don't know how to properly express myself but everything is connected as Djozz said. Like this:
I just scrape solder mask of those 4 vias and fill vias with solder for even better + contact to spring side.
My situation(one mode only) happened after shorting +- upper emitter wires with reflector ( i had only one layer of kapton tape on the bottom of reflector as protection and while I was pressing reflector +- wires somehow managed to dig hole into kapton tape, and then smoke out happened :) )
My drivers are potted so no way anything contacts with pill.
I haven't had any driver failure so far and they are in use for more than 3 months by various people.
It is dirt cheap and it works. It works even when smoked :)
I would not say this driver is winner over my diy Djozz driver guys.
My driver has High - mid - low without memory effect so it always starts on high. And I would not change that for new banggood driver unless they made similar modes.
Yes BG driver looks good but modes does not sound good to me.
Edit: - diy driver has reverse polarity protection
- It has a kind of low battery warning protection (light drops on about 1-2% at 2,8V of battery)
- 4.3A current draw of single ncr18650PF and all that stays in nice regulation for about 10 minutes on high and than another 10 minutes of 90-80% power, and then another 10-15 minutes around 80-50% output and then after some time it steps to low light warning protection which works for about 1 hour until it drops to 2,5V battery voltage.
- It is safe from start to complete battery discharge. So for all driver creators please try to make simple fet driver without memory, and user interface and with High - mid - low mode. Why? Try to sell flashlight to hunters and military guys and they'll say that they want instant full power action without any user interface.
Driver makers please try to make this mentioned version of driver and I guarantee that it will be your bestseller. You have nothing to loose.
I'm not very knowledgable in FET's, I just use what others use. I do hear that one FET is not the other, and that the specs highly matter. So if you post which exact FET you use, I hope that someone who does know this stuff will chime in.
I pulled it off my zy-t08 driver and was too eager to try it to look it up. I’ll do some poking on the t08 driver to see where each leg went.
edit
turns out to be the opposite of the FET used in the OP. Either needs to be rotated 180 degrees or mounted right-side-up. I chose right side up and isolated the back/bottom pad of the fet with kapton tape.
Always a good idea to search the code on an unknown FET. Not all or even close to all of them are appropriate to this usage. Look for the PDF data sheets with pinouts, drain source resistance, and gate voltage. If you don’t understand them then post a link to the PDF so it can be checked.
i have been thinking about trying this mod as well, but my programming-efforts so far have been limited to buying the hardware.
I was thinking about the mosfets mtn have, would one of them be good for this mod? and if, which one? AMC7135
That looks just like one I have. Guys I don't know even what FET is :) but I know how to build this driver(thanks to Djozz) so I really don't know what would be better.
Or Ebay one: http://www.ebay.com/itm/2pcs-New-NXP-4O30AL-403OOAL-4O3OAL-PH-4030AL-PH4030AL-SOT669/401027338093?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D34492%26meid%3D765e20dd42dd4e97bfe8b04e06bc3636%26pid%3D100011%26rk%3D1%26rkt%3D9%26sd%3D400900238110
I mean if I need to solder differently than mentioned on this thread than it can be problem?
I hoped that the original post was enough to make these. I will try making a more clear schematic.
Nice battery of drivers, l.a. ! I would never have thought that these would have been made in such numbers :-)
Just today I made a AK-47-A +FET driver for a Brynite B158 pill, the led is an Oslon Black Flat, that draws 3.8A on a 30Q. I tested this small 1x1mm die led today, and although it tested really impressive, in the Brynite I get 'just' 285kcd throw, where I hoped for close to 400. Apparently a 1x1mm die is not imaged well enough, too small for the Brynite lens.
It seems that no led can dethrone mighty XP-G2 S4 2B 285 kcd for B158 is really low no matter how funny it sounds :) . It is an exceptional flashlight. But now we know which led we should stick to.
In fact I done about 60 of them. They are running without issues in plenty of flashlight hosts. I just got inspiration with new batch so I just wanted to show you some, and I think I am not the only one that is doing them. You managed to spread this FET virus around the globe :)
When I saw this thread I asked myself: " jerk why the hell are you loosing time on stacking chips? Try that cause this Djozz guy really knows the modding stuff..." , and when I done few of them I realized that in fact you are one incredible guy cause you unselfishly show me how to make perfect driver for my needs.