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How to make a police siren using 555 IC

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.
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https://www.youtube.com/watch?v=eCbN-V65Qp8 How to make a police siren using 555 IC
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