Custom SkyRay King SRK Driver

That is one great driver for a light I do not own . (but now I finally want a SRK, with this in it)

I can't believe it goes from 0.25 to 2600 lumens.

BTW, with 4 x 2500 mAh cells in the light the 10 uA parasitic drain will drain the batteries in 1 billion hours… over 100,000 years. :party:

any chance this can be scaled down to fit the SRM (Sky Ray Mystery)?

where do i send the monies for the board/etc!!! just read the feature list again and im excessively excited. :slight_smile:

Brian

Why dont we start a Kickstarter or Indiegogo to crowd source enough funding to get these boards made?

I would happily contribute a nice chunk of change to see these things be made available.

I’ve done some testing on the thermal throttling code. Originally I had let it adjust the PWM up or down based upon the temperature, but this caused some problems. The temperature reading would bounce up and down a degree and the shifting PWM level would causing the light to flicker. I now only let the throttling go downward.

At the full 9 amps the case temperature reaches the 44C step down threshold after 1.5 minutes (the driver is about 9 degrees C above the case temperature). After around 10-12 minutes the light has stepped down about 50% and the temperature no longer rises. If the case reaches 60C the light shuts off completely.

Also, after doing some of the thermal torture tests, the Vf of the LEDs has shifted enough that they will no longer light up at that 0.25 lumen firefly level. It looks like the dimmest it will reliably do is around 6 lumens.

Math Fail.

4 * 2.5Ah = 10Ah

10Ah / 0.00001A = 1,000,000 Hours

1,000,000 / 24 = 41,666.66 Days

41,666.66 / 365 = 114 Years

Either way, Probably long enough :)

PPtk

Um, yeah. the cells will deplete themselves in under 10 or so years. :smiley:

Ooops… :8) divided 10,000 mAh by 10e-6 amps… should have been 10 Ah/10e-6 amps. Oh well, back to the drawing board. Anyway, it does beat the SRK parasitic drain of 5 ma by a factor of a zillion.

TP, I am so freaking impressed with what you've done here! Just amazing. :crown:

Can't waiit for them to be available. Put me down for two. $)

Nice work put me down for 2 also when available.

Kickstarter this!!!

Why? It's already being done, that's for things that need outside funding. This one just isn't ready yet.

Sounds good that way too: you can always turn it up again manually then. Though I know a couple would love it, I’m not sure how many people can ever use .25 lumen anyways… Great job, excited on this, it will make SRK useful again!

And 1billion years/114years/2 years = no real difference for any realistic use in that range :slight_smile:

Ive just gotta say, thats one nice looking driver. Youve sure come a long way with the firmware too.

If it ever fails, you could probably frame it and hang it on your wall. :bigsmile:

Here is a picture of the thermal management in action. X marks the spot when the driver reached 45C (the outer case was 38C) and the thermal management kicked in. That was at 2 minutes into the run (9A, 36 watts to the emitters). That big blip in the lumens plot is the light blinking 4 times to tell you about it.

As the temperature increased, the light started PWMing the LED intensity down. The temperature stabilized at around 55C. By then, the driver and the case were at the same temperature. The light started out at 2500 lumens and was down to 960 lumens when it stabilized. If the temperature had reached 60C, the light would have shut off.

The yellow temperature plot is a an IR thermometer. The red plot is a thermocouple on the head near the screw joint to the battery compartment. I had a warning alarm set to sound when the thermocouple reached 55C.

That’s pretty cool Texaspyro :slight_smile: Will we need to change anything except the driver to use it?

I have to say I did find out a way I can use my Skyray Kung however with my own free thermal management: I walked in the rain on high for 1 hour and no fried hands!

Nope… pry out old driver, unsolder wires to LEDs and switch (hint, label or tie-wrap the LED wires as you unsolder them. It’s easy to confuse which wires go to which LED), sand edge of new driver to fit your light, solder wires to new driver, press into the light, enjoy. The driver is made a tiny bit oversize to allow for manufacturing tolerances in the lights and driver.