These circuit designs are exceptional, it has been made for a Bicycle Headlight and as the parts count and cost has to be kept low, sparks of rare innovation can be seen in these designs. And the Hand drawn circuits remind you of Forrest Mims http://www.forrestmims.org/http://en.wikipedia.org/wiki/Forrest_Mimshttp://www.forrestmims.com/

The 3G Stepper from 3G Bikes is a bicycle that is powered by your vertical motion. Instead of peddling with your two feet like a normal human being, you stand upright and place your feet on two decks on either side of the bicycle.