Wiring Check / Resistor Help
Hello All,
I had originally posted this in the 2010 Electronic Lightsaber w/ DVD Tutorial Thread, as it was a modification to an existing diagram there, but considering I was also looking for assistance with resistors I wasn't sure where to post this. (I'll remove whichever doesn't belong). But I was hoping someone might be able to chime in on this modified schematic for the 2010 Ani board.
I was hoping to use a Tri Cree to mix purple, but I'm still a little soft on my knowledge of Ohms Law, and electronics as a whole. I read FJK's Ohms Law post (several times), and I've been reading everything I can possibly find on this great forum. I just need to validate that the schematic looks correct, and possibly get some help with which resistors I might need for my dies.
Here is the schematic: Schematic Pic
My math is as follows based on the specs from the Tri Cree product page in the store:
Battery is 3.7v
Red Cree
80.6 Minimum Luminous Flux @ 350mA
Forward Voltage @1000mA = 2.59v
Royal Blue Cree
600mW Minimum Radiant Flux @ 350mA
Forward Voltage @1000mA = 3.41v
RED: 3.7v - 2.59v = 1.11 ohms and 1.11ohms * 1amp^2 = 1.11watts for a 1.2ohm 1.25watt resistor - of which I was looking at the 1.2 ohm 3watt or a pot to dial-in the amount of red for the shade of purple I like... but I'm uncertain of what to go with.
RBLUE: 3.7v - 3.46v = 0.29 ohms and 0.29ohms * 1amp^2 = 0.29watts for a 0.47ohm 0.5watt resistor ...also considering that the upper voltage for the RBlue is 4v or so, would I even need to resist this? I've read several posts with yes and no answers. I would edge for caution and chose to resist, but I just want to make sure that I have the knowledge one way or the other.
AV: I had planed on using the 20mA DynaOhm Variable Resistor
I appreciate any time you can spare.
Thanks again!
