How to make a police siren using 555 IC HD

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