I just noticed this LD-34 side switch driver at LCK.
It wasn't there the last time I looked.
-23.5mm
-1 or 2 LI-Ion
-3A
http://www.lck-led.com/3000ma-side-switch-driver-mode-p-1235.html?cPath=135
Is that the Convoy L4 driver? Looks the same. Hhmm - Here's what I did to mine. Stripped it and mounted a BLF17DD with nice modes:
I’d like to hear more about that Tom. I don’t know how to piggyback BLF17DD onto an E-switch driver. If you could explain the process in simple language, it would really help expand my modding options.
Are you serious? Didn't mean to trash this thread... I'm sure some might be interested in this stock driver, but the problem is I would think it's designed for a specific mounted design - but who knows, could be the lights like the Convoy L4's were designed for this driver and not visa-versa. Or someone could, I suppose, mod a light to accomodate this driver for that switch mount.
I've done a few eswitch drivers mounts like this - couple of Yezl Y3's, etc. It's no different than a regular piggyback, it's just that you need to trace the two end pts of the switch. You need one end wired to the Battery '-' (i.e. ground) and the other connected to a pin on the MCU. For my firmware, it's set for pin #2. The original driver is simply converted to a contact board with a mounted switch. All I did was probe around with the DMM looking for contact pads for the switch. I think with this one, neither side of the switch was wired to ground, so I had to add a jumper from the pad to a ground pad.
For this mount, I notched the bracket of the switch in order to get the BLF17DD driver a little lower set, for clearance in the pill. The outer wires are the Batt '-' connection and add rigidity and support, while the Batt '+' is simply connected using 22 AWG wire (I think). Again, I double check continuity to find '-' and '+' paths, and if there's a choice, try to use paths that appear to be better (shorter, thicker, etc.).
Maybe not this particular driver, but piggy backing FET drivers onto Eswitch drivers. I wasn’t really following the FET driver threads when they were busy, and now I’ve been trying to figure out if piggybacking allows you to use a side switch with aFET driver and utilize the FET drivers modes too.
I’m a Johnny come- lately on the FET scene.
Ohh - A FET driver is no different, actually it's better/easier because of it's low profile, rather than piggyback'ed 7135's when you are going high amps. The Convoy L4, Yezl Y3, and those Warsun lights make great hosts for FET drivers because of their chunky pills and heads - kind of unusual to see some margin of over-engineering in Chinese lights.
I also did my Crelant 7G9 over again with a FET based driver - why not? It's all beef - 3 parallel cells, a massive pill (brass though...), big head, lots of heat sinking...
Tom, what is the resistor you have mounted on the one FET leg? I'm not used to seeing resistors on those.
Ohh - that was the old BLF17DD board, vers 1.0? So, it didn't have a spot for that resistor - was added later. It's a "1000" which is 100 ohms I believe. Forgot what it was for, but think the board had some flaky issues with mode switching, or inconsistent mode switching without it. Don't think anyone found a reason why it was needed on this board, but not needed on a Nanjg modified with a FET.
My thoughts were the Nanjg had smaller width/thinner routes or longer routes on the PCB than the BLF board, so naturally had a higher resistance built-in.
Has anyone resistor modded/bridged this (the L4’s) buck driver and used 2x-Li-ion + XM-L2? It could probably push a lot of current seeing as it’d have plenty of voltage overhead with which it could regulate current to the emitter.
The resistor is needed on the FET gate to get reliable mode switching. Not all set ups need it but it’s been unpredictable so far why one works without it and another doesn’t so it’s easier to plan on having that resistor.