Oh okay then. Thanks anyway.
I’ll try to find out how to 4S the emitters with the stock 1S MCPCB, and get myself a 4S tailcap. You do sell it a 4S tailcap if I understand? Or is it only for the MF01/02?
I have a tail cap board for the Q8 with 2 or 4S
Oh OK then. Thank you again Lexel.
Hello, I’m interested too.
I don’t think that price sounds unreasonable for a driver like that. I would be interested in a driver for 5s, 6s, 8s. Higher voltage is fine for the projects I have in mind. Some of the light builds I am considering are as high as 14s.
I have added a link to to this thread in my new BLFGT video as well. If I had know about this driver before I would have included it as an option in the video.
Powerful buck for 36V COB is planned with up to 12S and 5-6A output, above we have to consider how to get proper input MLCCs not cheap in 100V,
also LDOs in more than 60V and fast enough MOSFET above 50(60V rated) is an issue
Nothing speaks against Endermans quad buck driver design I made with just 2-4 circuits equipped, if mounted flsat to a heatsink as it is designed
So I found today a very odd problem with the LM3409 Buck driver
Its related to the voltage regulator, it seems in this case 10 Ohms resistor was to big get the LDO in a stable regulation,
it had a voltage drop over C1 from 16 to 10.5V, which is very bad, the resistor should decouple battery and LDO input voltage from spikes,
but the battery side looked pretty clean while the LDO side had every 20ms a big drop from the LDO probably resetting
output voltage had about 1.4V ripple on about 70% of the ramping very low working fine, then at a level it started
resulting in an unstable max. current as the current control voltage was not stable at 5V
Replacing the LDO and trying to solve probably capacitor issues replacing them as well did not help
I lowered R1 from 10 to 4.7Ohms this cleared all ripple on the LDOs input and output side
I recommend if you can solder SMD to do this on all drivers add a 10 Ohms resistor above R1
I am interested in a MF02 driver with battery boards and springs, my stock driver failed. 
Interested in one of the next-gen super high current buck drivers (like the CFT-90 driver for the BLF GT). Intended application is driving 7 ~6v Nichia 144 LEDs in parallel, from either 4s or 2s2p (which would work best?) in an SRK style light. If there’s a driver in this series that fits the bill, please put me down for it.
would a XHP35 HI D4 1A from kaidomain give higher lm/cd then D4 NW?
It’s hard to say. The D4 bin has a tolerance of plus or minus 7%. Assuming you had two that put out the same lumens at the same amperage, you’d need a lux meter that read the different color temps the same. Most of the inexpensive lux meters seem to be more sensitive to CW.
Using a single E Switch are the connections to S and G pads?
Yes.
In this pic for instance
The G pad is connected to ground.
The S pad is connected to leg 2 of the MCU.
Thanks Jason. The Lexel driver I have works like a charm.
Just finished modding my MF02 with Lexel’s driver and it is awesome! Better output than my stock driver and of course Narsil UI. Thanks Lexel!
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what driver gives more output for the MF02S? TA driver or Lexel driver?
If they are both FET, they should be the same. It’s more about what battery gives the most power.
Does Lexel make a buck driver for the MF02S? I’m not sure.
I thought Level was using the same buck driver for both the MF02 and MF02S?
If we are comparing a Buck driver to a FET driver, the FET is always more powerful. It delivers as much power as the batteries can give and slowly tapers off as battery voltage starts to go down.
The buck driver starts off at a lower amperage and power level but maintains steady output until the voltage gets too low to stay in regulation and then it starts to either taper off or step down to a lower power level.
Honestly, Lexel makes so many drivers they are hard to keep track of. Once he see this question I’m sure he’ll go into more detail.
I know Texas_Ace prefers the FET driver to run xhp70.2, but Lexel prefers to run it on his buck driver.
According to the info I can find on Lexels threads, his buck driver can do 7.5A@12v (you convert the battery carrier from 6v to 12v).
A FET driver can pull from 9 to 11 amps at 12v depending on the emitter, etc…
Nevermind it seems his new driver is FET driven.