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Make Police siren circuit using 555 timer, transistors and OP-AMP
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6 simple transistor555 siren circuit timer frequency eleccircuit hz Police siren.
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6 Simple transistor | police | ambulance Siren (audio alarm) circuits
POLICE SIREN - Basic_Circuit - Circuit Diagram - SeekIC.com
Make Police siren circuit using 555 timer, transistors and OP-AMP
Siren Generator using IC UM3561