want single mode only

Hi,i am trying to make an Ultrafire CREE XM-L T6 LED 18650 Flashlight just single mode only but keepingthe same driver,i have some 3V~5V 4* AMC7135 LED Flashlight Driver Circuit (Generic) 1400mA / reverse polarity protection / 17mm drivers from fast tech but just trying to see if can make original driver single mode.
I have several different 18650 flashlights that i want in single mode only but easiest way i can and
trying to keep original drivers where i can.I tried running a couple of them direct with centre spring + wired straight to the led but they went really bright blue for a couple of minutes then died.

Just made a 7W 65OLM CREE Q5 LED Focus Zoomable Flashlight single mode by removing brown capacitor and works perfectly.Did the same to the Ultrafire CREE XM-L T6 LED 18650 Flashlight but made no difference at all and still has all the same modes,there was only 1 capacitor on the driver but removing it didn’t make any difference so don,t know what else i can try to just make it 1-mode on/off.

Is there a simple way to mod drivers to single mode only,not bothered about maximum current etc just
want to make the flashlights all 1-mode only but not burn out using different batteries.

Is there a way i could wire the batteries direct to the leds but add a resister or something to limit the current so dont destroy the leds.I have various models of 18650 flashlights C8 etc and want them all just to have single mode only in the quickest and easiest way possible,i have fitted fast tech drivers to the torches using17mm drivers as quick swap but not all my drivers are that size so would be more work changing them.So just want a quick way to wire the flashlights to single mode on/off that wont overheat or burn out the leds.Any ideas?
thanks terry

Nanjg can be easyly modded to one mode. Simply connect one of the rightest legs of one 7135 to VCC.

I'm looking at modding a few 7135 drivers to single mode, these to be precise, does the above mod apply and if so can someone post a picture with what to do for this simple minded creature?

https://www.fasttech.com/products/1122302

Isn’t that the left hand leg of any of the 7135’s when looking from the rear of the chip where the lug is?

I just used some solder to bridge from the top of diode d1 to the leg of the 7135 chip just above it in the diagram.

Am I correct?

Are you set up for firmware flashing?

I have a single mode clicky firmware that still retains the LVP, so will step down the output when the cell is too low.

Yeah for single mode, just bridge the pad under the red wire to the nearest (left) 7135 pin. As FMC alluded to, you will lose LVP

Another jumper option, if you want to keep reverse polarity protection for the 7135s:

I prefer the 105D driver, for the cleaner look on the spring side:

https://www.fasttech.com/products/1612/10001683/1186301

Jumper goes in same place as on the 105C.


You should remove the MCU, or at least cut/lift pin 6 (top row of chip pins, second pin from the right). Pin 6 will sink 20-40 mA whenever the MCU is not in agreement with the forced ‘on’ state of the 7135s.

Drivers from FT has been a lottery for me. 105Cs mixed with 105Ds. 101s mixed with 47s, etc.
Simon also sell these, cheaper and neatly packed in anti-static bags:

Thanks for the help guys. Its much appreciated. So to keep low voltage protection I'd need to get the firmware modded. Any volunteers?

Sure - I'll be in touch via PM for the details.

Thanks FmC.