I have a problem to count the RSet resistor value for MAX7221 IC. I also have problem how should I drive 7-segment displays with that same IC with 9 volts.
Displays that I soon have are Kingbright's SC23-12SRWA(sorry I can't post a link because this is my first post here in this awesome forum :) ). Those displays forward voltage are 7.2 volts but I think I drive them with 9 volts. How should I connect these to my MAX7221? The IC can feed enough current, 30mA per segment.
What should be the resistor for RSet?