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03-01-2009, 09:12 AM #11Senior Member
Calling out to Weezard for LED advice
It's been an expensive night so far. :sadcrying I got everything glued onto the heatsink. The first joint which I thought was too thick was actually OK, but I somehow killed that LED anyway.
First, I set the Mastech to full volts, no amps. I just touched the probes to a red LED. It lit briefly, not super bright, but when I tried it a second time, nothing. I could see one of the 4 emitters was darkened--it was fried. It was almost like the power supply gave it a capacitive discharge.
I fired up the other reds, one a time, with no problems. Let them burn in for awhile; they were fairly consistent 10.8V giving 1.2A and 11.2-3V giving 1.5A. Then, on one of many go-rounds, that first one I glued failed to light. On examination, that one also had one cooked quadrant.
The wire I was using was so stiff it was really manhandling the LEDs. I tried to hold off on attaching the wires to the sink cause I hadn't had a chance too really think about they'd be routed: through a hole, around the side, etc. I managed to rip a solder pad each off two of them. Fortunately, I was able to scrale down to the trace and get a lead soldered to them. That's when I decided to go ahead and just use some thermal epoxy to secure the wires near the LEDs for some strain relief.
Gets worse. Still online?Need advice wth plant problems?
Use this form: http://boards.cannabis.com/plant-pro...ing-forms.html
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