It's been way too long since I've done any circuitry, and I need some help on a project. I'm planning to make a custom sports sign that is lit with LEDs. I'm planning to drill holes in a board, push the LEDs through the holes and solder them together on the back. I want it to run on 110 V AC (plugging it into a socket). I know I will need an AC to DC converter to get me to 12V, but I don't know how many LEDs I will be using yet. Probably around 100. Is that even possible or will they be too dim? I also realize I will need resistors, but I'm guessing it's impossible to calculate the resistance without knowing how many LEDs I will use? And lastly, I want to implement a switch, and probably a fuse. Can anyone help me with a diagram for this?