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အီလက္ထေရာနစ္ နည္းပညာ: May 2009
Police siren
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6 Simple transistor | police | ambulance Siren (audio alarm) circuits
Index 1011 - Circuit Diagram - SeekIC.com
How to Make Police Siren Circuit - YouTube
POLICE SIREN Circuit - Basic_Circuit - Circuit Diagram - SeekIC.com
Simple Police Car Siren