This car
reverse horn can be used with any vehicle having a 12V battery.
Transistors T2 and T3 form an astable multivibrator (AMV) that generates
beeping tone signals. Medium-power pnp transistor T1 functions as a
simple speaker amplifier.
BD139 (T4) is an npn medium power transistor. A 5.6V zener diode (ZD1) is connected to its base. ZD1 provides 5.6V DC regulated power supply to the horn circuit built around transistors T1 through T3. Diode D1 functions as reverse polarity protector. 12V DC to the circuit is connected via brake switch of the car/ three-wheeler.
BD139 (T4) is an npn medium power transistor. A 5.6V zener diode (ZD1) is connected to its base. ZD1 provides 5.6V DC regulated power supply to the horn circuit built around transistors T1 through T3. Diode D1 functions as reverse polarity protector. 12V DC to the circuit is connected via brake switch of the car/ three-wheeler.
Assemble the circuit on a general-purpose PCB and enclose in a suitable box. Connect 12V DC power supply to the circuit through the brake switch. When you reverse your car the circuit gets 12V required for its working. Place the cabinet in the vehicle such that it produces sound at the rear while reversing the car.
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