On 11/08/2014 03:45 PM, Greg Bernard wrote: > Not following your description, Jon. Do you have a pic of what you did with > the PC board? > I really ought to do this, but haven't made pictures so far. I take a 22" long, 2" wide piece of double sided PC board material. The dimensions are partly due to the material I have on hand, but it works well. I cut 10 grooves in the copper, making 11 2" square pieces of copper, separated by narrow slits. I only cut deep enough to totally isolate the copper and not weaken the fiberglass. This is all done on one side. I then solder 10 Cree XPEBWT-01-0000-00CC2LEDs (from Digi-Key) across the grooves. These are surface mount LEDs, and the copper sheet acts as a heat sink. I wire two of these strips in series, and then use the back side of the board to return the far end connection back to the other end.
I use a commercial LED power supply, LED25W-72-C0350, also from Digi-Key. This provides 350 mA to any string of LEDs from 24 - 72 V, and is highly efficient. Don't look at the LEDs when you power them on! They are insanely bright point sources. With a plastic diffuser, they only look a little different from a fluorescent tube. Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
