"If you are using a 7 segment display [and you are not multiplexing the segments, that is, all segments may be driven on together], you cannot have a single resistor in the common anode or cathode connection and expect a steady brightness for each displayed number, as the resistor would drop a different voltage depending on how many segments are lit ( one segment for "1" , 3 segments for "7" and all 7 for "8" ) "
Even in a multiplexed situation, a single resistor on the common lead is bad design.
heres a little simplified basic understanding.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16