running light

This simple circuit will doubtless find any number of applications in the modern home. It can be used to bore unwanted guests, to annoy the cat, or as a conversation piece. The circuit drives 8 LEDs, 4 of which are always on and four off. The line of illuminated LEDs appears to move along as the LED at the tail of the line extinguishes and a new LED illuminates at the head of the column.