Shadow SL3 + RGB SST-90's + custom 4ch driver (new CC driver in post 101)!

One more pic for now, this is how the Noctigon’s have to be shaved to be able to fit them all (this is just a white SST-90).

this project looks extremely interesting to me!

This project is great ! And this driver has more uses than just as an rgb driver (not sure what yet...)

Thanks man, I knew you would like it!

The driver could be useful for tint mixing of white emitters too, or emitter mixing and it wont be hard to mod it to 4ch for an XML color. With the big FET’s it’ll be overkill for a lot of projects (including pretty much anything XP based or an XML color) but I plan on adapting it down to 17mm using SOT-23 package FET’s (such as the IRLM2502 we use on 15/12/10dd’s), in that case instead of “white” being RGB all on at once white would have its own channel and its own emitter/die.

I love that idea of making a 17mm rgbw version with small FETS, (dream: especially if you manage to squeeze everything on one side of the board, that makes it suitable for more hosts).

Two concerns: 1) apart from those SST90 monsters there are no colour leds that can handle direct drive from a li-ion, so there must be space reserved on the board for current limiting resistors. 2) designing the board is a lot of work probably, and the group of people these boards are targeted at must be very small I guess?

I can mill wire clearance areas/pockets in the base of the reflector, if that would simplify things.

Man that thing is going to be sweet…Googled what a Shadow SL3 looked like

Daggum…and that is an INCREDIBLE job for your first Eagle design man!

If I was building a driver to try and sell (first I would have to take a different approach to the FW issue’s since I dont own either of the options I’m considering) and second I’d probably try to come up with a project that had a wider array of possible applications, this is purely for my own enjoyment and cause I have yet to find a commercially avaliable RGB light that is even the slightest bit interesting to me. Your concern about the limiting resistors is right inline with my to-do steps still, I was just talking with a few people about that last night and it will be how its done. Not only to limit total current but also to allow fine tuning of the output of each emitter without coding (eg the red channel will need much more resistance inline to make it not be overpowering at the same PWM levels in the code cause of the lower Vf of red emitters). I will try to see what I can do with the SOT23 FET’s to make it single side, you would like a center batt+ pad on the bottom for direct batt contact I assume (or + and- connections)? One thing I worked hard on with the current design was to make it so every connection (all LED +'s and - 's, switch + and - and power/GND in) all have via’s so the connections can be made from either side, you can run power and switch wires down and LED leads up or vice-versa or everything from either side. Can someone suggest the size and power rating for the limiting resistors? They would work best put between the FET’s source leg and GND correct (like on the old BLF 15DD)? Or it’d be better to put them on the FET’s drain inline with the LED-?

CC is that an offer or your just saying its possible? If its an offer I'll definitely take you up on that! I'm not looking forward to trying to shove all the copper banding in there, the driver compartment on this thing is only 10mm tall so there is very little room.

Thanks man, I made a few library parts last week but I pretty much went from knowing nothing to having that board made up in <48 hours, I made eagle my bitch lol.

this is my host, its a really nice grey color (excuse the very dirty lens, the reflector under it is perfect tho).

Not sure if its true with every SL3 but this one has an actually stainless bezel instead of aluminum. I’ll probably end up heating it up to turn it rainbow to match the RGB aspect before its back together.

What are the reflector dimensions? I have at least one spare 3x SRK reflector, but I think the SL3 is bigger.

Total diameter is 56mm and each of the cups are larger / deeper as well.

weeellll doggy! I'm pulling up a chair, popcorn, and beer for this one.

A disco in your pocket!

http://www.youtube.com/watch?v=A_sY2rjxq6M

17mm for direct install into lights without having to be piggybacked (yes I forgot to bStop the bottom batt+ pad but thats where the spring would go). This one has the correct size MCU pad (for the 85-20SU) and 2502 FET’s!

There are several known problems (and probably several more I dont yet know about) but I’m working on it. just wanted to show off for now. The bank of resistors at the top are limit resistors (right most is C1).

I just realized, the forward voltages of the color SST-90’s are different.

Red has the lowest, followed by blue and then green.

Driving them with FET’s may cause a problem.

Pages 12-14 on Luminus’ datasheet: http://www.luminus.com/products/Luminus_SST90C_Datasheet.pdf

The green and blue will be allright, the red @ 2v is as issue tho I’m running a RGB light with XP-E2’s now and it works allright, the red is by far the brightest. Thats what the addition of the limit resistors are for on the 17, I’m gonna start from scratch and do another 22 tomorrow.

I’m figuring I’ll use one or two 1206 pad per channel and I can stack them on top of each other if more are needed.

So R G B leds will be near white light? Anyways, WOW this needs to have video!!! 3 FETs on a board lol.

I’m sure it’ll be a heck of a light. Good luck with the build!

He has a working RGB right now…Cereal you should post it up to see what they are gonna get…just BIGGAH! :smiley:

These are XP-E2’s at ~1.2A each (that’ll soon be raised to 2.4A) the strobe it 19hz however each color only pulses at 1/3 that rate cause it does RGBRGBRGB (the iphone camera has no chance, video just doesn’t do it justice)