Car windshield wiper delay

The circuit provides a windshield wiper delay, dynamic braking and windshield wipers when they reach the rest position. This prevents the blades passing, which could lead them to stop at a point where they interfere with the vision of drivers. With the original wiper switch off, switch turns on the MLS delay circuit and disconnects the wiring SIB from automobiles. When SI is turned off, the original wiring system and controls the delay circuit is bypassed.

Regarding the SI uses the + 12 V to VI of the battery is a voltage doubler which produces + 18 V. This supply higher voltage is needed to ensure reliable turn on Ql through V2 multivibrator. This arrangement provides about +18 V to the gate of Ql, whose source is less than + 12 V drop V DS Ql. Ql stays on for a time determined by the interval between wipes WIPES potentiometervThe is controlled by the pause control when Cldrops below V + 4, U2 lights, turning on Ql and repeat the cycle.

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