Here is a simple, 555 IC based siren circuit. It’s like police siren. Someone make it for learning purpose and can connect to a burglar alarm. A piece of plastic bottle were used as horn or wave guide to maximize the efficiency.
Some more projects you may like:
How to make a bird whistle (water whistle) at home :
https://www.youtube.com/watch?v=9CjA5m2XdOg
How to make a simple electronic top - Gyro Stabilized
https://www.youtube.com/watch?v=iX3ujgtp7TI
How to make a small vacuum cleaner at home
https://www.youtube.com/watch?v=Gdm4itvY82c
How to build a mopping robot
https://www.youtube.com/watch?v=eCbN-V65Qp8
Some more projects you may like:
How to make a bird whistle (water whistle) at home :
https://www.youtube.com/watch?v=9CjA5m2XdOg
How to make a simple electronic top - Gyro Stabilized
https://www.youtube.com/watch?v=iX3ujgtp7TI
How to make a small vacuum cleaner at home
https://www.youtube.com/watch?v=Gdm4itvY82c
How to build a mopping robot
https://www.youtube.com/watch?v=eCbN-V65Qp8
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