It wasn't profound -- an improvement for an existing product. The idea came from suggestions made by users on a web forum. Since it's an electronic gadget that means a new design. It's a fairly specialized audio related device. What I needed to do was a circuit board design spin and prototyping stage, then a bunch of testing.

One good thing was that the effort could be broken into chunks, and interrupted. I didn't need the kind of "flow" that programmers often talk about.