I didnt bought the leds yet, so its not a problem. i just dont know the forward oltage (and whats its means), what should i get a common cathode or anode?
Can you explain me why do i need transistors? as far as i know they function as a buuton - but not physically' you "press" it with and electric pulse, so why do i need many transistors?
30 (10x3) LEDs drawing probably around 20 mA each will require a 600 mA power supply
i only want 10 leds
thnx