I have built the 4 layers of 4x4 LED's and connected them up.
My question is what transistor should I use. I know that only one layer will be on at a time and the max current draw will be 16*20mA = 0.320A
I want to use a NPN as my layers are common cathode so the transistor will connect the layer to ground.
So what specs should I be looking for, I know Ic needs to be greater than 320mA
I am looking at a 2N4401 at the moment. Would this suit? If not why
I will have the Anodes driven by 2 74HC595's. An AVR will be doing all the hard stuff.