2B-CAR REVERSE MUSICAL HORN
You can use this musical horn as sound signal while brake horn or backing the vehicle with your car, Jeep & tractor etc. The persons around the vehicle become careful and save from accident by listening its sound while backing the vehicle.
In this project popular CMOS IC UM66T is used, There are 64 musical notes in the IC. This IC is being used in door bell, toys and greeting cards. There is a notes selector circuit built inside IC which selects 64 notes and the output of the IC is available at pin no. 1 of the IC. This is amplified by the transistors T1 BEL187 and T2 BC548B connected in darlington pair.
The IC looks like transistor BC548B. Its main attraction is that it consumes very less DC supply and number of external parts required is very less.
To operate the project negative supply is given directly from the body of car or vehicle and +ve DC supply is given through reverse switch. When car or vehicle is to be reverse then at that time with back light it also gives the sound of musical horn. In normal position only the main horn of car works.
The pin no. 3 of the IC UM66T is earthed. The positive supply to the pin no. 2 is given from collector of transistor Q3 [HA100B]. To provide regulated DC power supply to the IC in the circuit. The regulator circuit made of transistor Q3 [HA100B] is used.
PRECAUTION WHILE ASSEMBLING THE PROJECT.
- Take care that there is no short circuit while being soldering work.
- Check all components so that they telly with the components required for the circuit.
- While soldering IC UM66T take care of its pins and solder properly.