Im just catching up…
RMM pumps out custom mod lights like crazy, so it would be difficult for him to remember the details of each. Here’s some notes from Richards PM (copy/paste) concerning his FET driver build for my J20:
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i. I put one of the 46mm SRK drivers in mine, but it is still a bit too small so I soldered some shims on the outside ground ring. I also soldered two qlite springs together on the battery side that were then assisted by a silicone wire (in lieu of copper braid.) I also added the zener diode and off-time FW and capacitor. Usually the 46mm driver is used with an e-switch, but it doesn’t need to be.
That said, none of them are a direct drop in but any of the FETs could work if piggybacked onto the stripped stock driver. You will need it zener modded or else it will fry in very short order. For me the 46mm option was the easiest, but if I were to build a bunch of them I think I would just strip the stock driver, reflow the FET onto one of those pads, then piggyback a zener mod driver to control that FET.
ii. Yes, you do need to rewire the emitters. You need 3S4P. I also swapped the down wires to 22 AWG silicone.
iii. Copper braid everything else if possible. This light can handle the heat, no problem. Surprisingly the tail switch has been holding up to 15A+ for a while now.
If you have any more questions feel free to ask!
Richard
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As for recharging TF32650 unprotected cells, Ive been using an Xtar SP2. If you push the cells slightly off-center in the charging slots, it will allow the cell ends to make contact with the tabs and charge a pair of these cells @2A each.
From another thread: Discharge result at 10 Amps is 5797mAh. The unprotected TF32650’s are awesome and dont even break a sweat at 10A sustained discharge rates.
Trustfire TF32650 6000mAh test/review After removal of the crappy PC, compare the 10A curve (capacity and sustained voltage to any 26650, and they all lose). I have 12 of these cells that have been cycled at 7A several times. Although they are less than a year old, they discharge evenly with the same ending voltage in 3S config and havent shown any signs of deterioration yet… which is usually not the case with any of the Chinese cells. So AFAICT, no other cell of this size or smaller can match the capacity and sustained high voltage of the unprotected TF32650 @10A.
IMO, all else being equal, its not worth the L2 on copper upgrade since human eyes wont notice a large increase in apparent brightness. Different tints are a whole other ball-game. :bigsmile: