When I connect a Led-Display to a BCD-Encoder chip (the 7447) I need to connect a 330 Ohm resistor in serie with the output pins at the 7447 pins to each pin at the Led-Display so the each of the leds in the display wil light up right (each of them draw 15mA). But what if I connect 4 Led-Displays to a single BCD-Encoder? Shall I use 330Ohm at each of the pins? or 80 Ohms? Or something else? I really don't know, even if this is basics.
Thanks!
Lac.
Thanks!
Lac.