AUTO_SIGNAL_MINDER

Published:2009/7/13 5:30:00 Author:May | From:SeekIC

If the ignition is on and the parking lights are on or off, the noninverting input of U1 is at 8 V and the inverting input is either 0 or 4 V. That causes pin 6 to go high, keeping the buzzer off. If the ignition is off and the parking lights are on, the noninverting input is at 0 V and the inverting input is at 4 V. That brings pin 6 low, activating the buzzer. With the ignition and turn signal on and the parking lights on or off, the noninverting input is at 8 V and the inverting input pulses at 12 V, causing the buzzer to sound in step with the blinker.



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