Simon’s smashing it with the biscuit drivers!
Discription indicates “turn off if the voltage is below 2.8V (low voltage protection for lithium battery)”
I’ve been looking for a good 1A/2AA/14500 driver - does this mean 2xAA will only work until 2.8V?
There's no mention for dual cell operation in overview. It may have issues with 2x fresh cells out of the charger, and it could also have problems regulating the moonlight mode.
If the input voltage is 2-2.8V, the driver will not work.
Is there a resistor (4R7?) that I can remove that would bypass LVP, if needed?
Can I ask what the PWM frequency is for the AA / 14500 / 16340 driver is, please?
I seem to remember people saying the original Convoy T2 had visible PWM.
In these days I finaly understood how most of AA/14500 drivers work. They boost voltage from 1.5 to 4V for example to power MCU and additional electronics. When the input voltage is bigger from setup output voltage boost doesn’t work and just output voltage is the same as input. So the simplest method to control the LED is to be used PWM in most of cases.
Oops I spotted MCU label on new 20mm linear driver 
I see no reason as to why the newer AA/14500/16340 driver should have PWM. It clearly is a regulated driver,
which boosts voltage when input is from low voltage cells, and when it receives input from li-ion it should either buck or work in some sort of linear :???: mode. What do you think, icpart?
Look at the MOSFET switcher in that driver, above the schottky and to the left of the inductor. It's really tiny!!!
Most boost converters goes in pass through mode when input voltage is above output voltage so I wrote the simplest method for control is PWM. Most cheap drivers use that method, but here you are maybe right. I can’t identify which component is boost controller maybe that device which you point is boost driver ic. But if you look bottom side of PCB there is sense resistor. So I think they used the same linear regulator after boost converter. They don’t regulate the boost driver. AAA0 is probably mosfet transistor which works as linear regulator. Another device at the same PCB side is our favorite opamp which control that mosfet.
That tiny thing with the letters 11G on top is using some 2×2mm package, being right next to the bulk of the driver's (copper) cathode. I think it must be some MOSFET.
You mean that, when the driver detects high input voltage, that tiny and poorly heatsinked A00D part is the MOSFET? Well, I don't think so. I could know more, but that looks to be part of the current control feedback stage, or sort of. :???:
So if that AOOD is not control mosfet it will be need only for turbo. From PCB traces I can see that. If another device is main switching mosfet how the circuit will work from low voltage AA battery. Also input LDO, OPamp will need higher power supply voltage. Another way is if MCU stared to work from 1V and if it control PWM signal for mosfet based boost converter. But I’m not very sure is that in the case.
AA/14500 version non-PWM
Sonix SN8F57-something? SN8F570200? 
Oh, that is nice :+1:
Thank you, I’ll add that to my list of stuff to order (when the UK gets out of coronavirus lockdown).
Hello! I'm here to ask a little question (for Simon). I just received an M2 host ordered nearly two months ago (thank God its home now, there's been many delays with airborne mail shipments). I ordered it because I thought it used the same size reflector as the M1 (after all M1 & M2 reflectors are for sale in this Convoy store advertisement), to build a pocket thrower.
However, having the M2 side by side with my M1 makes me dubious. The M2 head is appreciably slender, and looking at the front of each to my eye I'd say the M1 reflector is a bit bigger. Still no measurements taken, I must admit, my M2's head is still unopened. So I am somewhat confused, is the M1 reflector actually bigger than the M2 reflector? Because if so… :facepalm: Never mind. Yes, the M2's reflector is slightly smaller than the M1.
Still, the M2 looks great and more pocketable (M2 reflector size ∅28.9 × 22.8mm). I wonder what are the actual differences in throw versus an M1 (M1 reflector size ∅31.8 × 23.2mm). ≈81.17% is M2's reflector area versus M1. 
uh ,the reflectors of M1 and M2 are different
Hopefully postage picks up again soon - my last Convoy parcel left China 1st of April and has gone into a black hole 
i think you will get it finally ,it’s just slow
Agreed - just hope it’s soon 
I hope. My orders are still in transit since April 12 and not here yet, but should soon. Your shipping is good and reliable.