I am using 5 seven segment displays, with an Arduino Mega. They are common anode. Each anode is hooked up to the emitter of a NPN transistor, the collector powered by 5 volts, and the base is powered by a High/Low from the Arduino. I have them multiplexing correctly to display what I need, but the problem is the displays are very faint.
Is this a problem of the current draw being too much, or is it a result of the actual display? I don't want to invest in different displays unless I know that they will be bright enough. Do different displays have different brightness's?