Hello Hello I really need some help. please Help me... :'(
(Each led = 20 mA + 1,6 V - 2 V)
If I have 3 leds in series on one pin without transistor, would that be fine? if so, what would be the resistor needed? If I have 3 leds in parallel on one pin without transistor, would that be fine? which resistors do I need?
and If I have 20 leds in parallel on one pin using a transistor of 1A, how can I know what would be the resistors needed? Can I use a 9V battery? or a 5v power supply?
I'm sooooo confused... please help me.. i would really appreciate it a lot... :-[