Johnstown hopes to replace all its traffic lights

Even as crews put the finishing touches on a new traffic light on West Main Street in Johnstown, City Engineer Chris Vose ...
YouTube on MSN

NAV lighting system for RC airplanes | 555 timer IC

Today we are going to create a strobe light for the tips of the wings of an rc airplane using a 555 timer (NE 555 or lm 555 ...