Can you guys check and look over my work
Ok, I just ask you guys to look over this and see if I have calculated it all right:
So, now i have decided to put 6 Leds behind each panel in serie with a resistor at 18ohm 1/4W. simple ohmslaw:
6leds x 2,3V = 13,8
15V - 13,8V = 1,2V
1,2V / 0,07A = 17,1428...ohm = 18ohm.
1,2V x 0,07A = 0,084W
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All the LEDs wil then draw 2,87A from the PSU
1,2V / 18ohm = 0,066666...A
42plates + dots = 43plates
43plates x 0,066666...A = 2,87A
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This load will be split between two 7815s, with can deliver 2A each. When i say split I mean i cut the whole circuit in half, 22plates at one regualtor and 21 at the other, around 1,5A at each. With a big heatsink (fan?)
The powersupply delivers 3,2A at 19V (60,8W) wich should be enough.
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I think have done it all right, just wanted to double check my work.
Cheers!
Lac.