|03-26-2012 11:13 PM|
|03-26-2012 09:33 PM|
I'd built three boards, I even made a make shift ESD mat and grounded my two prong iron's tip.
I get very limited dimming and tons of flicker. I've moved this temporarily to the backburner for mountain biking as of late.
Thanks for the help so far, I'll delve back into it.
|03-01-2012 11:17 PM|
|03-01-2012 05:37 AM|
I've built two so far, but I just finished tapping the heatsink, hoping to do a test Friday night.
So far so good. The boards turned out great!
|03-01-2012 03:13 AM|
|03-01-2012 12:34 AM|
|MoeBetta||Up and running! Now to finish the array!|
|12-27-2011 03:49 PM|
I use SeeedStudio Services : Seeed Studio Bazaar, Boost ideas, extend the reach
Their minimum order is 10 boards and the cost is very reasonable. I had my last order sent DHL express shipping, which brought up the cost of the boards to $46 total. That may seem expensive but- I received the boards 9 days after placing the order. You'll wait more than a month if you go with their "free shipping' option.
There is an "error" in the boards that I left there intentionally. It's the "Thermal Via" placed under the LM3409 IC.It's placed there to facilitate soldering of the "ground tab" under the chip. Make sure that you invest in a hands free magnifier prior to attempting to solder that chip to the board, it's extremely small, and difficult to see otherwise. I start assembly of each board by soldering in the LM3409 first(it's the most difficult to solder) and testing all 10 pins with a multimeter, before bothering to solder the rest of the components.
Let me know if you want to order from Seeed as I have the Gerber files already generated for the job. All you would have to do is rename them with your order #.
|12-27-2011 02:47 PM|
o2, who do you use for small batches, and how many boards are you generally ordering at once?
I just ran the Batchpcb .dru and had some errors around the LM3409 since it's so small.
|12-27-2011 04:49 AM|
Thanks once again O2, I'm looking over that excel spreadsheet trying to finalize my component selections then I'll be just about ready to move forward on this part of the project.
LED's are on their way.
|12-15-2011 11:23 PM|
|O2surplus||Here's the EAGLE files for the PCB and the Bill Of Materials needed to build a copy for 48V/3,000mA operation. I'll update the parts list for higher Voltage/Current operation as soon as I can get more parts and do some testing.|
|12-15-2011 07:13 PM|
I have to admit that locating some of the parts needed for 48V/4.5A operation is a bit tough, and drives up the cost, but I'm working on it. I can post a bill of materials for this driver for 48V/3A operation, as that's what I intend to build more of. Let me kow what Ya'll think.
|12-15-2011 06:07 PM|
|S&KGray||Very nice! What is the low end of the maximum current adjust range?|
|12-15-2011 04:57 PM|
|MoeBetta||That is exactly what I need. Amazing.|
|12-15-2011 04:02 PM|
I want to build my own, but I'd need handholding throughout the whole process.
I think I'll wait till after I've put my arduino PWM controller together...
|12-15-2011 03:46 PM|
Well folks- here's the newest design.It features Analog Maximum Current adjust-ability and PWM dimming. I designed this on to operate off a 48 Vdc supply and output up to 4.5 amps. I'm sure (with the proper fuses and load balanced led strings) this little driver could run 48 XPG's at 1000ma (4 strings x 12 ) or 1 string of 12 XML's at 3000 ma. Not too shabby- IMHO, for a driver that costs around $20 to build. I'll post up the EAGLE files and a BOM if anyone's interested in building their own.
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