Here's the plan: I want to use one bi-color resistor for Power and HDD activity on my briefcase box. I want it to be, say, green when just the power is on, and flicker red when there's HDD activity.

Here is a simple logic state indicator to test whether the output of digital IC is in logic 1 or 0. The Bicolor LED lights Green when the logic state is 1 and lights Red when the logic state is 0. The ...