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Windscreen or Windshield wiper controlling circuit

2015-02-28 07:42  
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A windscreen wiper or windshield wiper is a device used to remove rain and debris from a windscreen or windshield. Almost all motor vehicles, including trains, aircraft and watercraft, are equipped with such wipers, which are usually a legal requirement.A wiper generally consists of an arm, pivoting at one end and with a long rubber blade attached to the other.The blade is swung back and forth over the glass, pushing water from its surface.This circuit provides complete speed control over car`s windshield wipers.They can be slowed down to any rate even down to four sweeps per minute.The controller has two principal circuits: The rate-determining circuit a unijunction transistor connected as a freerunning oscillator, and the silicon-controlled rectifier which is the actuator.Windshield wipers are found on car windshields, some car headlights, airplanes and even on the space shuttle.The fi­rst windshield wipers were operated manually by moving a lever inside the car back an­d forth.Today, most of us take our electric windshield wipers for granted. The wipers faithfully keep the window clear, moving back and forth across the windshield countless times as they sweep the water away.
 

Windshield wiper controller