Car windshield wiper delay

The circuit facilitates a windshield wiper delay, dynamic braking, and ensures that the windshield wipers return to their resting position. This design prevents the wiper blades from stopping at a location that could obstruct the driver's view. When the original wiper switch is off, a switch activates the MLS delay circuit and disconnects the SIB wiring from the vehicle. If the SI is turned off, the original wiring system is re-engaged, bypassing the delay circuit.

More: The SI operates using +12 V from the vehicle's battery, which is fed into a voltage doubler that generates +18 V. This elevated voltage is essential for reliably turning on transistor Q1 through the V2 multivibrator. The configuration provides approximately +18 V to the gate of Q1, with its source voltage being less than +12 V, accounting for the V_DS drop across Q1.

Transistor Q1 remains activated for a duration determined by the interval set by the WIPES potentiometer, which is adjusted by the pause control. When the capacitor C1 discharges below V + 4, the operational amplifier U2 is triggered, turning on Q1 and initiating the wiper cycle again.

The circuit employs a multivibrator configuration that ensures smooth operation of the windshield wipers, allowing for a controlled delay between wipes. The use of a voltage doubler not only enhances the voltage available for the control circuitry but also improves the responsiveness of the wiper system. The design is focused on safety and efficiency, ensuring that wiper blades return to a non-obstructive position while maintaining optimal visibility for the driver. The integration of the potentiometer allows for user customization of the wipe interval, adapting to varying weather conditions and driver preferences.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.