Re: Handling current through a 74HC595

Hello,

> apologies if this question is very stupid. :) > I have been toying with electronics for a little while, but I know I > lack some basic knowledge to wrap everything up together so... here is > my doubt. > > I am designing some Christmas decoration with a bunch of LEDs driven by > an array of 74HC595s (controlled by an ATtiny45). The whole thing will be > > I did something similar in the past, using three 595s to control three > 7-segment LED displays, but I did it fairly randomly: I just connected > each output to each segment, with a resistor between the two. > Since this thing I'm planning to do is going to be simple yet much > bigger -- involving twelve 595s -- I'd like to do things properly. > The 96 LEDs could and probably will be all on at some point, so > considering a current draw of 15 mA for each LED, the whole thing would > draw a total of about 15 A
96 x 15mA = 1.44A

15mA is actually a lot for a LED, you can run them at much lower current for a roughly proportional drop in luminosity. High efficiency LED's can be insanely bright at only several mA.

Dave.

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David L. Jones
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