Description.
Here
is a simple circuit that will produce a musical horn when ever your car is in
reverse gear.The circuit uses two ICs for the operation, voltage regulator
7805(IC1) and musical tone generator UM66(IC2). The IC1 reduces the car battery
voltage to 5V. The diodes D1 & D2 in combination produces an
additional drop of 1.4 V to give a 3.6 V supply for the UM66. The supply
voltage of UM 66 should not be more than 4V. When ever the car is in
reverse gear ,the reverse gear switch of the car gets activated and the circuit
gets connected to the car battery. The UM66 starts playing the music tone. The
transistor T1 amplifies the output of UM66 to drive the loudspeaker.
Circuit diagram with Parts list.
Notes.
§ Assemble the circuit on a good quality
PCB or common board.
§ Place the circuit on a waterproof place in the
dashboard.
§ The switch S1 is the reverse gear switch of
the car.
§ Before attempting the circuit,have a
good idea about the electrical wiring of your car.A wrong connection may damage
your car’s electricals.
§ The transistor Q1 is not very specific.Any
medium power NPN audio transistor will do the job.You could easily find
one from your electronics junk box.
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