2B-4-TUNE SIREN PRODUCING HIGH SOUND
[12 V] OPERATED
The project given here produces the kind of sound like admistrative or emergency van also. The sound like machine gun can be produced through this projects. It can be fitted to your cycle or car. This is also being used as car horn
TECHNICAL DESCRIPTION AND WORKING
This project has been developed and tested O.K. in our TV Engineers Technical Lab. The components and PCB used in the projects published in our books are available for sale at resonable prices.
This project is the modified version of the project ” 4 TUNE siren ” publised in Vol – 1 of this series. The project published in Vol-1 produces a very low sound , which is eliminated by this project. This project produces a loud sound of four tunes. The working of this project mainly depends on the IC UM 3561/3562. The IC is a Rhythm generator IC but in this project it produes for tune of sound like siren.
- Police Siren
- Ambulance Siren
- Fire- Tender
- Machine Gun
The entire project has two sections.
1:- Rhythm Generator – In this section only 4 tunes of sound frequency are generated from the IC 3561 and it is available at its output pin [no-3].
2:- Audio Amplifier
The output availble from pin no 3 of the IC is amplified by two transistors BC 148 and BEL 187. The speaker from which these four tune sounds are heard. The project operates on 12 V DC. But its Rhythm generator section operates on 3.1 V supply which is availble from this 12 V DC power supply.
PRECAUTIONS WHILE ASSEMBLING THE PROJECT:-
- Check all the component as per the circuit.
- se IC base for mounting IC. The IC may be damaged it excess heat is applied or the soldering iron is leaky.
- Check the collector , emmitter and base of the transistor before soldering.
LIST OF COMPONENTS:
IC UM 3561/3562 1
TRANSISTOR BC 148 1
BEL 187 1
ZENER 3.1 V 1
5 POLE BAND SWITCH 1