I'm building a sculpture in Buenos Aires and I'm using an atmega128, 7 gorgeous TLC5940 PWM led drivers to independently control my leds.
I know almost nothing of electronics and I'm in a hurry with this. I'm trying to figure out the best way to connect the led arrays (how many in series...) because I don't have time to build up my own power source so I have to stick with a few Computer power source or something like that.
TLC output is negative so, as well as how to arrange the leds, I need to now what to use, mosfet or darlington? Wich ones are the best for my application?
I've choose to go with the high current path, so the longest array will hold 50 arrays (I=1A total) and use a transistor that can take 2A.
Is there a better way? I'll feed the emitter of the Transistor with something like 12V and use a resistor between the led array and the emitter (open collector is the name of this?).