Nanjg 105c output problem....

Flashlight Modding and DIY Parts
1

Hello guys,

I have recently bought 5x nanjg 105c 2800ma and 2x nanjg 105c 2100ma all from fasttech…

so i set up an xm-l t6 1c led connect it to a driver and then to 1x 18650 fully charged battery placed on a battery carrier…

I powered it up, change thought the modes but it did not seem to have the brightness it had when driven with tha uf-f10 driver a 1,88A measured with dmm…

So i took some measurements and the results were
low 0.05a
medium 0.5a
high 1,2a

I thought that it was a bad driver so I tried all of my drivers and all gave up the same results…

I then tested the nanjg 105c 2100ma drivers and the also gave almost the same results…

Low 0,04a
medium 0,5a
high 1,1a

I then tested a KD 3040ma V2 driver I had and the results were
low 0,05a
med 0,6a
high 1,54a

I then measured the battery and it was 4,17v. I thought it may be the battery so I tried a fully charger sanyo 2800ma 4,2v and a fully charged Panasonic 2900ma @4,23v but the results in output remained the same…

I then checked every connection on the board and also if both sides are connected and everyhing looks fine…

I then thought tha it was a problem with the code and flashed dr Jones code both as it was and modified but nothing changed, on high the nanjg only outputs 1,2A…

I really need some help here…

2

If you post a picture of both sides of it we can confirm you recieved the correct board. My personal theory is the battery carrier has to much resistance to all much more current through.

3

Or maybe thin DMM leads.

4

Connect the battery without the batttery carrier and see what happens with your current readings.

5

the board is the right one, it has 8 Amc’s,4 on each side and the attiny13a… it is also writen on it “105c”…

The dmm measures the correct current on the buck driver of the uf-f10 so I don’t believe tha it is the dmm… if it was it would it measure correctly on the other driver???

I just measured the resistance of the battery carrier, it is 1.2ohms on the -ve side and 1ohm on the +ve side… so total of 2,2ohms

do you believe tha tha this is the problem?

right now i so not have a way to connect the battery without the carrier to check…

6

Yep the carrier is the problem, 2.2 ohms is way to much for our purposes.

7

Thanks a lot for the help!!!

as soon as I test it out I will inform you!!!

thanks guys!!

8

Measuring resitance. DMM, leads, connections, leads, etc.

Had the same issue with my regular DMM leads, they put a cap on 2.8A.

9

I see…

I will change the wiring in my project to 20AWG and put copper contacts to squeeze as much current as possible…

10

... just to subscribe :)...

11

With the KD 3040ma V2 version I used thick wires with a direct connection to the battery (No carrier). I first noticed the problem when doing a tail cap measurement installed in the light. I then tried one out of the light with no change. Tried different mode configurations no change. I must have installed the driver 5 or 6 times thinking a had a bad connection somewhere until I tested another one out of the light with the same results.
Installed a lightmalls 2800ma 105c version in the light and had around 2.8a at the tail. Added 2 more amc7135’s to the 2800ma version got 3.5a. Measured with a 87v at the tail cap with a sanyo 2600mah. Wish you luck finding out whats going on with yours. Let us know what you find, I would be interested to hear your results.

12

I will do 007,
but it may take some time as I am away from home and I don’t have everything with right now…

In the meanwile I willl order some more 105c to have for testing…

I hope the problem to be finally the 2+ Ω resistance of the battery carrier…

13

I recently took delivery of a nanjg 105c also from fast tech.

The mode change behaves strangely. If left on a mode for around 3 seconds or more, tapping the switch doesn’t take me to the next mode. The mode repeats. I have to tap again.

Does anyone have this problem?

14

That is normal… this is how they work…
you tap to activate the timer and then again to change mode…
If you stay more than 2s in the mode ot locks it again…

Am I right programming experts?? ;) ;)

15

Is this supposed to be a feature? If so, I don’t like it. My other lights don’t behave like this.

16

Yup, you are very right georgek!! This is how this driver works and I love the 2 group instead of soldering stars!

Today I modded my Keygos M12 with one 8*7135 and added 3 more 7135, pulling 3.8A! Replaced the wires for 21 AWG also and added some wires to the driver spring and tailcap spring!

17

Hello guys!!!

I am back home and I finally have access to my full inventory :stuck_out_tongue:

the problem was the dmm leads which have 2 ohms resistance…

I have measured the current using my uncles pro dmm and on the 105c with one amc7135 350ma added (total 9x 350ma amc7135) I am reading 3100ma to the led (xm-l u3)…!!!

btw I want to thank again those who helped me a lot with the driver programs!!! they know who they are!! :stuck_out_tongue: