7–84 Intermittent Timing Circuit for Windshield Wipers Acar maker needs an RCtiming circuit to trigger the windshield wiper relay. The circuit should be driver selectable to trigger at 1, 2, 5, and 10 s ± 5%. The source circuit is the car voltage of 12 V with a series resistance of 10 Ω. You must use standard parts

(see inside rear cover). You have a single-sided OP AMP available with a VCC of 0 V and + 12 V that you can use to trigger the windshield wiper relay. The relay triggers with an input of

+ 12 V± 1 V. You may assume that the circuit resets after the trigger. You should validate your design using Multisim.