Sense resistor mod to KD Super Output P7 Driver

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AlexGT
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Sense resistor mod to KD Super Output P7 Driver

Question for the forum Gurus and Experts!

I have this Kaidomain driver that I use with 2 × 18650’s (8.4v) and gives around 3A to the led

I am wondering if it would be safe to solder one additional R120 resistor on top of the existing R200’s that the board currently has (3 o’clock position in the pic) and if I will get an increase in current to the led by doing this, can anyone estimate what the new current to the led would be by adding one R120 resistor?

Thanks in advance for your help!

AlexGT

Edited by: AlexGT on 03/12/2013 - 22:37
AlexGT
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Well, I just went ahead and did it and current did increase a bit, now using 2 18650’s is pulling 2.3a from a stock 1.8a, now my custom 2 1/4C Mag With Throwmaster reflector rivals my modded TN-31.

Rufusbduck
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Nice work If you edit your post to include the name of the driver, then searches for this mod will find yours. I.e. Sense resistor mod to KD Super Output P7 Driver.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

AlexGT
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Agreed, will change it for future reference

FlashPilot
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AlexGT wrote:
Well, I just went ahead and did it and current did increase a bit, now using 2 18650’s is pulling 2.3a from a stock 1.8a, now my custom 2 1/4C Mag With Throwmaster reflector rivals my modded TN-31.

Nice mod Alex. I have this driver. Were your measurements from the tailcap or at the emitter? Also, have you ever experienced the thermal cut-off feature this driver was noted for? What about low voltage warning?

Rufusbduck
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I’ve used this driver for a few different mods, 2 bike lights and one handheld. 7x nimh for the bike lights and 6x nimh for the handheld. Both features functioned as described in Kd’s specs. A different blink for each and shift to low mode. I think lowV is two blinks and over temp is 3 blinks.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

AlexGT
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Current Measurements at tailcap

gords1001
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I can see me trying this, I have a couple of these drivers and like them a lot, boosting the current output is very pleasing to me.

gords1001
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Ok, I see this being used in an upcoming build, it seems 4.5a drivers are few and far between.

Just need to track down some R120 smd resistors now because a pot won’t work here Flat Stare

Flomotion
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gords1001 wrote:
Ok, I see this being used in an upcoming build, it seems 4.5a drivers are few and far between.

Just need to track down some R120 smd resistors now because a pot won’t work here Flat Stare

Fasttech carries smd resistors:

http://www.fasttech.com/category/1002/resistors/?smd%20resistors

http://www.fasttech.com/category/1002/resistors

http://www.fasttech.com/products/1002/10003143/1234403-0805-012r-smd-pre...

Flomotion

gords1001
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Cheers flow, just what I needed buddy 8)

benz
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Does anyone know if fitting another R120 resistor will increase the output current further? 

bdiddle
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I forget what resistors I added to mine, but it pulls ~3 amps at the tail

Newb

photon1k
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benz wrote:
Does anyone know if fitting another R120 resistor will increase the output current further? 

Adding another R120 will lower the total sense resistance, and very likely increase the output current, but the driver may or may not be able to handle it.

Edit: Has KD missed a decimal place? This thing cannot possibly cost $43.99.

bdiddle
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That is for 5 pcs

Newb

photon1k
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Thanks. Didn’t notice that… :8)

photon1k
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Lightmalls has a better price.

bdiddle
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Wow thanks for showing that, of all the high output drivers I have used that one has been the least troublesome.

Now I can get it cheap…..

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benz
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Thanks bdiddle, at least I know 3A at the tail is possible.

Rufusbduck
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Anybody try this driver with an mt-g2 off 2 cells?

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

richnpc
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Is that the driver that Match used his 4M mod?

http://budgetlightforum.com/comment/reply/16168?quote=1#comment-form

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richnpc wrote:
Is that the driver that Match used his 4M mod?

http://budgetlightforum.com/comment/reply/16168?quote=1#comment-form


I think so.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

Rufusbduck
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Bump, anyone get emitter current after the sense resistor mod and is the driver still working?

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

A380
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I have tried to make the resistor mod also.
Original output to the emitter 3A.
Adding 1xR200 3.98A.
2xR200: low 0.49A, mid 1.5A, high 4.97A.
Found really difficult soldering this tiny things and have to figure out how to add heatsinking mass to it.

crz6662
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Both the links to this driver are dead. Anyone have a good link please?

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Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

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Thanks Rufusbduck……