billes de Newton en mouvement perpétuel

The circuit described here was designed to fulfill the need for a jet airliner sound effects generator in a school play which involved an attempted hijack. The unit had to be capable of producing a number of typical jet noises as heard from the inside of the aircraft -start-up, idle, take-off, in-flight, approach, landing and reverse thrust conditions -together with tyre squeal on landing and machine-gun fire.