This is what i got from my scope
Upper picture = Output MCU
Lower pcture = Mosfet gate input
Low Mode
Medium Mode
High Mode
Yes, you right ImA4Wheelr
Those MCU only “pull up” output to approx 5V (scope at DC coupled)
So if i jumper those pin to V+ (lets says i’m feed it with 15V supply), its will be fine ?
s
Camera setting still same, ISO 400 ; F/3.5; 1/4s IIRC
^ I agree with FF. You definitely don't want to feed 15v. You want the Vcc for the MCU which should be in the 3 to 5 volt range. Nice work. I need to learn how to use a scope.
You got it bro. Jumper MCU pad for Pin 1 to the MCU pad for Pin 4. Keep or pull the MCU, which ever you prefer. Nice mod work tjeret. Great DIY attitude and initiative. Glad you joined BLF.
Any plans to increase current further?
EDIT: Wonder why Pin4 and Pin 5 have a jumper. Trying to look at the trace for Pin 5, but can't make it out. Are you counting the pins like this?:
Ok will try to remove those MCU
Those pin 4 and 5 already have a jumper as default configuration
i don’t know if output MCU can be parallel
yes i count like datasheet
Look like i’m good with those 4.2A
modification to heatsink for higher current will be PIT*
s
I accidentally pull a trigger for K40M couple week ago after testing the output Solarforce K3
because i thought this one will not be a good “thrower”
Hopefully it will arrive soon and will try to crank current little further
No need to remove on my behalf. It should be fine with it. If you do remove, I suggest a cheap hot air gun (not a hair drier. I think you know that but other readers may not). If you do, please try to get a back lit trace picture.
tjeret wrote:
Those pin 4 and 5 already have a jumper as default configuration
i don’t know if output MCU can be parallel
Me either. A good trace picture of each side would help.
tjeret wrote:
Look like i’m good with those 4.2A
modification to heatsink for higher current will be PIT*
Sounds good. I know where you are coming from.
tjeret wrote:
I accidentally pull a trigger for K40M couple week ago . . .
ah, huh, accidentally. I've accidentally pressed the "buy" button and accidentally input the payment information too. clumsy fingers.
Nice looking driver mod there. So the pad for Pin 5 goes to nothing. My guess is that Pin 5 on the MCU was the actual PWM out. So they had to bridge it to Pad 4 to feed the buck controller.
It was a real pleasure collaborating with you and FrickelFreak on these mods. You should be proud of your accomplishments on this light. You demonstrate some fine craftsmanship. Looking forward to seeing what else you come up with in the future.
I put back two 0R27, now current around 5.7A
with 1 minutes operating those tiny driver is very hot
Unfortunately still can not reach those K40M :_(
I’ll stop with 5.7A
Congrats again tjeret. Pushing the poor little driver hard now.
I'm not aware of any good buck drivers that get much over 5 amps that are under 26mm diameter. There are a couple great minds on BLF working on diy solutions for that but it seems to be quite a challenge.
That driver of yours looks quite small for 5.7 amps. What diameter is it?
This one have around 19mm diameter
Ok, what about linear regulator like parallel 7135 ? better than buck regulator ?
No problem, i can DIY a little bit
Someone that knows better will chime in. I think you have done well to pull 5.7 amps out to that driver. So that Solarforce K3 driver seems to be a pretty decent driver, potentially. But, maybe its the other mods you did to it that is enabling it to handle 5.7 amps. Either way, good on you :)
Hmmmm, 7135 does not seem to be a good option. They would have to shed tons of voltage (heat).
How large a diameter driver can you fit in that host? Or, do you mind moving the driver external to the head?
That a maximal diameter (20 mm inside host)
I thinking on external driver too, but i’m aware about high current
since i can not replace those “thin” cable to Emitter :~
any thought?
There are probably all kinds of option if you can go external. The HX-1175ba is one, but there may be others that are just as good or better. I've driven it to 11 amps to the emitter with 4S Li-ion without any problems (talking MT-G2). The large diode on it is only rated for 10 amps though.