I wanted to upgrade him with a solar engine, and I decided on the FRED solar engine. Originally, I was going to build the FLED solar engine, but it is so inefficent it drove my perfectionist side insane. Sooooo, I ended up spending half an hour getting this circuit to work, and I suceeded in getting it to pulse in direct sunlight and under an incandescent desk lamp. The FLED couldn't even pulse with the light bulb literally on top of the solar cell!
I included a video of it pulsing wherever videos I embed in my posts go/are.