I'm trying to drive nine pins with my mega, but they can't quite source enough current. I thought a transistor array would do the trick, but the transistors need to be between 5V source and the load. The commonly used ULN2803A has a common ground and needs to go betwen the load and ground. I need an array with common Vcc.
The loads I'm working with have a common ground. Just picture nine LED's with their ground pins tied together. This is a legacy piece of equipment, so can't be altered.
Does anyone know of a transistor array that can do this, or will I need to use a bunch of single transistors.