Car Backup Alarm Circuit - the car back up alarm that will be introduced adopts the voice integrated circuit which can make the alarm sound of ding dong back up to remind the pedestrian of safety the working principle of the circuitthe car back up alarm consists of the sound generator and the op output circuit the brake lights of the automobile trigger this circuit on and off this save the annoyance of the alarm when it is not needed this is an older circuit which was published in popular electronics magazine but still a good circuit today the working principle of the circuit the car back up alarm consists of the sound alarm circuit and op output circuit see as figure 7 122 the sound alarm circuit consists of the switch s resistors of r1 and r2 capacitor c1 voltage stabilizing diode vs and 3 terminal sound alarm integrated circuit ic the brake lights of the automobile trigger this circuit on and off this save the annoyance.

of the alarm when it is not needed this is an older circuit which was published in popular electronics magazine but still a good circuit today for speaker use a another box if you are using big 8ohms speaker like 0 5watt or 1watt and hide it some where in the back of the car for this purpose a good quality 1 meter audio wire should be used from the circuit to the speaker the brake lights of the automobile trigger this circuit on and off this save the annoyance of the alarm when it is not needed this is an older circuit which was published in popular electronics magazine but still a good circuit today it indicates the distance of car from any object and raise an alarm when it reaches close to the wall or the object and needs to be stopped this car parking circuit is quite easy and uses few monly available ponents which are listed below the alarm will sound your car horn if anyone.

opens the car door while the circuit is armed the timers will allow you to leave the car without sounding the horn to turn the circuit on s1 must be closed how to silence a ford backup alarm by james melzer when your ford truck is preparing to park shifts into reverse or the rear bumper is obstructed a series of warning beeps will sound letting you and others know the truck is backing up



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