This is a circuit of car reversing horn with normal auto lamp flasher that uses timer ICs NE556 and NE555. When the car is in reverse gear, the switch S1 which is the reverse gear switch of the car get shorted and the monostable timer give a high output. So the diode D1 and D2 goes for high for a time period R4C4.
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| Circuit Diagram of Car Reverse Horn With Flasher : Click to enlarge |
Now the astable multivibrator starts oscillating which will drive the speaker through capacitor C6. When output of D1 and D2 goes low multivibrator is disabled to stop oscillating there by disabling sound through speaker.
The flasher circuit is very simple and composed of common 555 IC which drives a square wave. This drives the 12V, 10W auto bulb through transistor TIP31.
Note:
Assemble the circuit on a common PCB.
Connect point A & B to car reverse gear switch S1.
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