\Skyray king mod idea.

[Pavithra_uk]

@texaspyro

@Pavithra_uk

this is the fault. current sense output connected near FET. Not near Sense resistor.

BTW, R1 and R2 sense resistors should be labeled 0.01 ohm, not 10K.

oh sorry its just explanation only. to show problem.

SRK driver has 0.01 ohm.

[FlashPilot]

@Pavithra_uk

@FlashPilot

@Pavithra_uk

For those who have low output power, I found some design flaw in SRK Driver.

at stock condition, each LED drive at 2A. when I check it, only one LED driver 2A. others 1.2A & 1.5A

After spend few hours with SRK driver, finally found it has track design problem.

will update here after easy/best solution found.

• Is this a 3 terroid driver version SRK?
• Can you tell us how many amps the driver pulls from the cells when charged to 4.2V?
• When and where did you buy your SRK?
  Thanks for working on this.

yes its 3 torroid driver
it can easily put 3A but depend on cell condition. over 3A not practical due to high heat, no enough lumen increase

I don’t own SRK
Im working with my friend’s SRK
Im going to buy SRK this week. May be Fasttech’s gold SRK (37.90:money_mouth_face:

Can you test with a +10A power supply or +4 x 18650 cells @4.2V? Thanks for the schematics above. Now I wonder if all SRK’s deliver an unbalanced load to each emitter, regardless of the 6.5A draw from the cells. Im waiting on sinkpads before I pull mine apart again. At that time, I can test current to each emitter. Anyone else able to do this now?

I guess we could block each emitter/reflector with cardboard & tape and compare lux between emitters as another way to roughly estimate.

That 7135 master/slave setup is sounding better all the time…

[comfychair]

@FlashPilot

Can you test with a +10A power supply or +4 x 18650 cells @4.2V? Thanks for the schematics above. Now I wonder if all SRK’s deliver an unbalanced load to each emitter, regardless of the 6.5A draw from the cells. Im waiting on sinkpads before I pull mine apart again. At that time, I can test current to the emitters. Anyone else able to do this now? I guess we can block each emitter with cardboard & tape and compare lux between emitters as another way to roughly find out. That 7135 master/slave setup is sounding better all the time…

Fandyfire UV-S5 (link) does 7.19A w/4 cells, and 5.30A with only one(!). As far as tearing it apart I'm in the same boat, waiting on copper. I finally found 3 more 15k '153' resistors on an old dead video card, though.

Speaking of waiting on copper, shouldn't they be done any day now? It's been like 3+ weeks, hasn't it? It... it hasn't? Maybe the calendars are wrong...

[FlashPilot]

Im just glad the sinkpad order went through. It was looking shaky for quite a while. I think we are still a good 3 weeks out…

[texaspyro]

@comfychair

I finally found 3 more 15k ‘153’ resistors on an old dead video card, though.

Just because it says “153” does not mean that they are 15K resistors. 1% resistors use a different marking code. Check them with an ohm meter first!

[comfychair]

They are 15k. While I had the hot air going I harvested any that had 'interesting' numbers, all the others were completely not what I thought they would be but the 153s are indeed 15k'ers.

[texaspyro]

@comfychair

They are 15k. While I had the hot air going I harvested any that had ‘interesting’ numbers, all the others were completely not what I thought they would be but the 153s are indeed 15k’ers.

The last character in the 1% code should be a letter, but it is surprising how often thinks like “B” show up as “3”. Been there, done that. |(

[comfychair]

Haha, yeah, how about the ones that still look like valid characters even when they're turned wrong side up? xD

I reeeeally need one of those nifty magnifying desk lamps, 'cause trying to hold a flashlight and butane torch AND a loupe in one hand while the other hand does grain-of-sand-resistor plucking... you know, I think I'll go prowl ebay right now as a matter of fact.

[texaspyro]

@comfychair

I reeeeally need one of those nifty magnifying desk lamps

Waldmann Omnivue Lighted Magnifier Nichia 219 Retrofit

I have a rather nice lighted magnifier in my workshop. It is a Waldmann Omnivue. These sell for around $400 each, but I snagged this one years ago at a local surplus store for around $40. [image] The only problems with it is that it uses 3 G23 9W compact fluorescent bulbs. These put out around 500 lumens each. The magnifier lets you select either two or three bulbs. There is also a snap-in diffuser over the tubes. You can get add-on lenses for a X2 and X4 magnification boost. [image] Floures…

[comfychair]

@texaspyro

@comfychair

I reeeeally need one of those nifty magnifying desk lamps

Waldmann Omnivue Lighted Magnifier Nichia 219 Retrofit

This one worth the money? The ones with round tubes can be had cheaper but look like a PITA to retrofit...

[ChiggerPepi]

I just bought this one , and it is absolutely top notch quality, completely worth every penny.

There are a few different mounting options and snake arm lengths.

Here is the magnifier attachment:
http://www.amazon.com/Danray-Products-LLC-LMP-MA-Snake-Arm/dp/B000FSK9Y4/ref=sr_1_8?s=hi&ie=UTF8&qid=1363935017&sr=1-8

[Serifus]

Would it be possible to calculate the Vdrop before the current sense resistor, and then Figure out what each of them needs to be to get 2A out of each xml? I wonder if anyone here would be able to put together a better driver for 4paralell X18650 as it looks like most of them have fairly interchangeable parts.

[comfychair]

There are a fair number of drivers out there that'll run 3 XM-L wired in series, but the sticking point is the SRK's electronic switch. Finding a driver for an electronic switch, AND 3x LEDs, AND more current per emitter than what the stock driver does, is, I think, pretty much impossible. Though I'd love to be proven wrong!

[texaspyro]

@comfychair

Finding a driver for an electronic switch, AND 3x LEDs, AND more current per emitter than what the stock driver does, is, I think, pretty much impossible. Though I’d love to be proven wrong!

I’ve been thinking of building one for quite a while. The price would probably not be pretty.

[DrJones]

Uhm, NANJGs with custom firmware for electronic switches are available somewhere around here…

One master, two slaves, 3.04A version, should be bright.

Was my first plan, but my King puts out a lot, so I decided to mod just the MCU.

[FX-32]

@DrJones

so I decided to mod just the MCU.

How is your MCU Mod working? Do you have all the modes you would like on it right now?

[Pavithra_uk]

For those who want to replace stock driver, there is a another way for it.

Easiest way:

If you worry about modding NANJG driver’s MCU to work electronic button switch, Stock SRK driver’s MCU can be used.

SRK driver’s MCU has 3 PWM outputs for each LED driver.
You can easily drive 3 NANJG boards with it.

If anyone need pinouts and explanation for disconnecting exiting 3 toroid driver, will post here.

[xmint]

@Pavithra_uk

For those who want to replace stock driver, there is a another way for it.

Easiest way:

If you worry about modding NANJG driver’s MCU to work electronic button switch, Stock SRK driver’s MCU can be used.

SRK driver’s MCU has 3 PWM outputs for each LED driver.
You can easily drive 3 NANJG boards with it.

If anyone need pinouts and explanation for disconnecting exiting 3 toroid driver, will post here.

Yes please

[comfychair]

CRAP! I thought I had '153' resistors, but when I snapped some macro pics so I could actually see what I had been working on, looks like I got something mixed up and stacked on some 'ESI' resistors instead!

[MRsDNF]

Its all good comfychair. These resistors have a mercury switch in them that allows them to run as ESI resistors up one way and turn the light over and they work as 153 resistors. There will be a problem though if they are mounted in different directions. You will have light coming out the tailcap if this is the case.